Propane

Propane (/ˈproʊpeɪn/) is a three-carbon chain alkane with the molecular formula C

8. It is a gas at standard temperature and pressure, but becomes liquid when compressed for transportation and storage. A by-product of natural gas processing and petroleum refining, it is often a constituent of liquefied petroleum gas (LPG), which is commonly used as a fuel in domestic and industrial applications and in low-emissions public transportation; other constituents of LPG may include propylene, butane, butylene, butadiene, and isobutylene. Discovered in 1857 by the French chemist Marcellin Berthelot, it became commercially available in the US by 1911. Propane has lower volumetric energy density than gasoline or coal, but has higher gravimetric energy density than them and burns more cleanly.[1]

Propane gas has become a popular choice for barbecues and portable stoves because its low −42 °C boiling point makes it vaporise inside pressurised liquid containers (it exists in two phases, vapor above liquid). It retains its ability to vaporise even in cold weather, making it better-suited for outdoor use in cold climates than alternatives with higher boiling points like butane.[2] LPG powers buses, forklifts, automobiles, outboard boat motors, and ice resurfacing machines, and is used for heat and cooking in recreational vehicles and campers. Propane is also becoming popular as a replacement refrigerant (R290) for heat pumps as it offers greater efficiency than the current refrigerants: R410A / R32, higher temperature heat output and less damage to the atmosphere for escaped gases—at the expense of high gas flammability.[3]

## Contents

* 1 History
* 2 Etymology
* 3 Properties and reactions
* 3.1 Energy content
* 3.2 Density
* 4 Uses
* 4.1 Portable stoves
* 4.2 Refrigerant
* 4.3 Domestic and industrial fuel
* 4.4 Motor fuel
* 4.5 Other uses
* 5 Purity
* 6 Comparison with natural gas
* 7 Hazards
* 8 Production
* 8.1 Retail cost
* 8.1.1 United States
* 9 On other planets
* 10 See also
* 11 References
* 12 External links

## History

Propane was first synthesized by the French chemist Marcellin Berthelot in 1857 during his researches on hydrogenation. Berthelot made propane by heating propylene dibromide (C3H6Br2) with potassium iodide and water.[4][5]: p. 9, §1.1 [6] Propane was found dissolved in Pennsylvanian light crude oil by Edmund Ronalds in 1864.[7][8] Walter O. Snelling of the U.S. Bureau of Mines highlighted it as a volatile component in gasoline in 1910, which marked the "birth of the propane industry" in the United States.[9] The volatility of these lighter hydrocarbons caused them to be known as "wild" because of the high vapor pressures of unrefined gasoline. On March 31, 1912, The New York Times reported on Snelling's work with liquefied gas, saying "a steel bottle will carry enough gas to light an ordinary home for three weeks".[10]

It was during this time that Snelling—in cooperation with Frank P. Peterson, Chester Kerr, and Arthur Kerr—developed ways to liquefy the LP gases during the refining of gasoline.[9] Together, they established American Gasol Co., the first commercial marketer of propane. Snelling had produced relatively pure propane by 1911, and on March 25, 1913, his method of processing and producing LP gases was issued patent #1,056,845.[9] A separate method of producing LP gas through compression was developed by Frank Peterson and its patent was granted on July 2, 1912.[11]

The 1920s saw increased production of LP gases, with the first year of recorded production totaling 223,000 US gallons (840 m3) in 1922. In 1927, annual marketed LP gas production reached 1 million US gallons (3,800 m3), and by 1935, the annual sales of LP gas had reached 56 million US gallons (210,000 m3). Major industry developments in the 1930s included the introduction of railroad tank car transport, gas odorization, and the construction of local bottle-filling plants. The year 1945 marked the first year that annual LP gas sales reached a billion gallons. By 1947, 62% of all U.S. homes had been equipped with either natural gas or propane for cooking.[9]

In 1950, 1,000 propane-fueled buses were ordered by the Chicago Transit Authority, and by 1958, sales in the U.S. had reached 7 billion US gallons (26,000,000 m3) annually. In 2004, it was reported to be a growing $8-billion to $10-billion industry with over 15 billion US gallons (57,000,000 m3) of propane being used annually in the U.S.[12]

During the COVID-19 pandemic, propane shortages were reported in the United States due to increased demand.[13][14][15]

## Etymology

The prop- root found in propane and names of other compounds with three-carbon chains was derived from propionic acid,[16] which in turn was derived from the Ancient Greek words πρῶτος, protos, "first" and πίων, pion, "fat", as it was the "first" member of the series of fatty acids.[17]

## Properties and reactions

File:Propane flame contours-en.svg

Propane is a colorless, odorless gas. Ethyl mercaptan is added as a safety precaution as an odorizer,[18] and is commonly called a "rotten egg" smell.[19] At normal pressure it liquifies below its boiling point at −42 °C and solidifies below its melting point at −187.7 °C. Propane crystallizes in the space group P21/n.[20][21] The low space-filling of 58.5% (at 90 K), due to the bad stacking properties of the molecule, is the reason for the particularly low melting point.

Propane undergoes combustion reactions in a similar fashion to other alkanes. In the presence of excess oxygen, propane burns to form water and carbon dioxide. CA3HA8+5OA2⟶3COA2+4HA2O+heat When insufficient oxygen is present for complete combustion, carbon monoxide, soot (carbon), or both, are formed as well: CA3HA8+92OA2⟶2COA2+CO+4HA2O+heat CA3HA8+2OA2⟶3C+4HA2O+heat The complete combustion of propane produces about 50 MJ/kg of heat.[22]

Propane combustion is much cleaner than that of coal or unleaded gasoline. Propane's per-BTU production of CO2 is almost as low as that of natural gas.[23] Propane burns hotter than home heating oil or diesel fuel because of the very high hydrogen content. The presence of C–C bonds, plus the multiple bonds of propylene and butylene, produce organic exhausts besides carbon dioxide and water vapor during typical combustion. These bonds also cause propane to burn with a visible flame.

### Energy content

The enthalpy of combustion of propane gas where all products return to standard state, for example where water returns to its liquid state at standard temperature (known as higher heating value), is (2,219.2 ± 0.5) kJ/mol, or (50.33 ± 0.01) MJ/kg.[22]

The enthalpy of combustion of propane gas where products do not return to standard state, for example where the hot gases including water vapor exit a chimney, (known as lower heating value) is 2,043.455 kJ/mol.[24] The lower heat value is the amount of heat available from burning the substance where the combustion products are vented to the atmosphere; for example, the heat from a fireplace when the flue is open.

### Density

The density of propane gas at 25 °C (77 °F) is 1.808 kg/m3, about 1.5× the density of air at the same temperature. The density of liquid propane at 25 °C (77 °F) is 0.493 g/cm3, which is equivalent to 4.11 pounds per U.S. liquid gallon or 493 g/L. Propane expands at 1.5% per 10 °F. Thus, liquid propane has a density of approximately 4.2 pounds per gallon (504 g/L) at 60 °F (15.6 °C).[25]

As the density of propane changes with temperature, this fact must be considered every time when the application is connected with safety or custody transfer operations.[26] If enough headspace is not left in a tank when filling, the tank could rupture when it heats up.

Temperature–density curve for liquid/vapor propane

## Uses

### Portable stoves

Propane is a popular choice for barbecues and portable stoves because the low boiling point of −42 °C (−44 °F) makes it vaporize as soon as it is released from its pressurized container. Therefore, no carburetor or other vaporizing device is required; a simple metering nozzle suffices.

### Refrigerant

Blends of pure, dry "isopropane" [isobutane/propane mixtures of propane (R-290) and isobutane (R-600a)] can be used as the circulating refrigerant in suitably constructed compressor-based refrigeration.[27] Compared to fluorocarbons, propane has a negligible ozone depletion potential and very low global warming potential, or GWP (having a GWP 20 value of 0.072,[28] ​1⁄14 that of carbon dioxide, and a GWP 500 of 0.006, ​1⁄170) and can serve as a functional replacement for R-12, R-22, R-134a, and other chlorofluorocarbon or hydrofluorocarbon refrigerants in conventional stationary refrigeration and air conditioning systems.[29] Because its global warming effect is far less than current refrigerants, propane was chosen as one of five replacement refrigerants approved by the EPA in 2015, for use in systems specially designed to handle its flammability.[30]

Such substitution is widely prohibited or discouraged in motor vehicle air conditioning systems, on the grounds that using flammable hydrocarbons in systems originally designed to carry non-flammable refrigerant presents a significant risk of fire or explosion.[31]

Vendors and advocates of hydrocarbon refrigerants argue against such bans on the grounds that there have been very few such incidents relative to the number of vehicle air conditioning systems filled with hydrocarbons.[32][33]

Propane is also instrumental in providing off-the-grid refrigeration, as the energy source for a gas absorption refrigerator, and is commonly used for camping and recreational vehicles.

It has also been proposed to use propane as a refrigerant in heat pumps.[34]

### Domestic and industrial fuel

Domestic spherical steel pressure vessel for propane storage

Since it can be transported easily, it is a popular fuel for home heat and backup electrical generation in sparsely populated areas that do not have natural gas pipelines. In June 2023, Stanford researchers found propane combustion emitted detectable and repeatable levels of benzene that in some homes raised indoor benzene concentrations above well-established health benchmarks. The research also shows that gas and propane fuels appear to be the dominant source of benzene produced by cooking.[35]

In rural areas of North America, as well as northern Australia, propane is used to heat livestock facilities, in grain dryers, and other heat-producing appliances. When used for heating or grain drying it is usually stored in a large, permanently-placed cylinder which is refilled by a propane-delivery truck. As of 2014[update], 6.2 million American households use propane as their primary heating fuel.[36]

In North America, local delivery trucks with an average cylinder size of 3,000 US gallons (11 m3), fill up large cylinders that are permanently installed on the property, or other service trucks exchange empty cylinders of propane with filled cylinders. Large tractor-trailer trucks, with an average cylinder size of 10,000 US gallons (38 m3), transport propane from the pipeline or refinery to the local bulk plant. The bobtail tank truck is not unique to the North American market, though the practice is not as common elsewhere, and the vehicles are generally called tankers. In many countries, propane is delivered to end-users via small or medium-sized individual cylinders, while empty cylinders are removed for refilling at a central location.

There are also community propane systems, with a central cylinder feeding individual homes.[37]

### Motor fuel

Main article: Engineering:Autogas

In the U.S., over 190,000 on-road vehicles use propane, and over 450,000 forklifts use it for power. It is the third most popular vehicle fuel in the world,[38] behind gasoline and diesel fuel. In other parts of the world, propane used in vehicles is known as autogas. In 2007, approximately 13 million vehicles worldwide use autogas.[38]

The advantage of propane in cars is its liquid state at a moderate pressure. This allows fast refill times, affordable fuel cylinder construction, and price ranges typically just over half that of gasoline. Meanwhile, it is noticeably cleaner (both in handling, and in combustion), results in less engine wear (due to carbon deposits) without diluting engine oil (often extending oil-change intervals), and until recently[when?] was relatively low-cost in North America. The octane rating of propane is relatively high at 110. In the United States the propane fueling infrastructure is the most developed of all alternative vehicle fuels. Many converted vehicles have provisions for topping off from "barbecue bottles". Purpose-built vehicles are often in commercially owned fleets with private fueling facilities. A further saving for propane fuel vehicle operators, especially in fleets, is that theft is much more difficult than with gasoline or diesel fuels.

Propane is also used as fuel for small engines, especially those used indoors or in areas with insufficient fresh air and ventilation to carry away the more toxic exhaust of an engine running on gasoline or diesel fuel. More recently,[when?] there have been lawn-care products like string trimmers, lawn mowers and leaf blowers intended for outdoor use, but fueled by propane in order to reduce air pollution.[39]

Many heavy-duty highway trucks use propane as a boost, where it is added through the turbocharger, to mix with diesel fuel droplets. The very high hydrogen content of propane helps the diesel fuel to burn hotter and therefore more completely. This provides more torque, more horsepower, and a cleaner exhaust for the trucks. It is normal for a 7-liter medium-duty diesel truck engine to increase fuel economy by 20 to 33 percent when a propane boost system is used. It is cheaper because propane is much cheaper than diesel fuel. The longer distance a cross-country trucker can travel on a full load of combined diesel and propane fuel means they can maintain federal hours of work rules with two fewer fuel stops in a cross-country trip. Truckers, tractor pulling competitions, and farmers have been using a propane boost system for over forty years[when?] in North America.

### Other uses

File:Propane cylinders type 2012 and 2000 in Tuntorp.jpgCylinders type 2012 containing 2 kg, and type 2000 containing 0.34 kg propane; sizes normally used for camping devices and hobby projects in workshops.

* Propane is the primary flammable gas in blowtorches for soldering.
* Propane is used in oxy-fuel welding and cutting. Propane does not burn as hot as acetylene in its inner cone, and so it is rarely used for welding. Propane, however, has a very high number of BTUs per cubic foot in its outer cone, and so with the right torch (injector style) it can make a faster and cleaner cut than acetylene, and is much more useful for heating and bending than acetylene.
* Propane is used as a feedstock for the production of base petrochemicals in steam cracking.
* Propane is the primary fuel for hot-air balloons.
* It is used in semiconductor manufacture to deposit silicon carbide.
* Propane is commonly used in theme parks and in movie production as an inexpensive, high-energy fuel for explosions and other special effects.
* Propane is used as a propellant, relying on the expansion of the gas to fire the projectile. It does not ignite the gas. The use of a liquefied gas gives more shots per cylinder, compared to a compressed gas.
* Propane is also used as a cooking fuel.
* Propane is used as a propellant for many household aerosol sprays, including shaving creams and air fresheners.
* Propane is a promising feedstock for the production of propylene.[40]
* Liquified propane is used in the extraction of animal fats and vegetable oils.[41]

## Purity

The North American standard grade of automotive-use propane is rated HD-5 (Heavy Duty 5%). HD-5 grade has a maximum of 5 percent butane, but propane sold in Europe has a maximum allowable amount of butane of 30 percent, meaning it is not the same fuel as HD-5. The LPG used as auto fuel and cooking gas in Asia and Australia also has very high butane content.

Propylene (also called propene) can be a contaminant of commercial propane. Propane containing too much propene is not suited for most vehicle fuels. HD-5 is a specification that establishes a maximum concentration of 5% propene in propane. Propane and other LP gas specifications are established in ASTM D-1835.[42] All propane fuels include an odorant, almost always ethanethiol, so that the gas can be smelled easily in case of a leak. Propane as HD-5 was originally intended for use as vehicle fuel. HD-5 is currently being used in all propane applications.

Typically in the United States and Canada, LPG is primarily propane (at least 90%), while the rest is mostly ethane, propylene, butane, and odorants including ethyl mercaptan.[43][44] This is the HD-5 standard, (maximum allowable propylene content, and no more than 5% butanes and ethane) defined by the American Society for Testing and Materials by its Standard 1835 for internal combustion engines. Not all products labeled "LPG" conform to this standard, however. In Mexico, for example, gas labeled "LPG" may consist of 60% propane and 40% butane. "The exact proportion of this combination varies by country, depending on international prices, on the availability of components and, especially, on the climatic conditions that favor LPG with higher butane content in warmer regions and propane in cold areas".[45]

## Comparison with natural gas

Propane is bought and stored in a liquid form, LPG. It can easily be stored in a relatively small space.

By comparison, compressed natural gas (CNG) cannot be liquefied by compression at normal temperatures, as these are well above its critical temperature. As a gas, very high pressure is required to store useful quantities. This poses the hazard that, in an accident, just as with any compressed gas cylinder (such as a CO2 cylinder used for a soda concession) a CNG cylinder may burst with great force, or leak rapidly enough to become a self-propelled missile. Therefore, CNG is much less efficient to store than propane, due to the large cylinder volume required. An alternative means of storing natural gas is as a cryogenic liquid in an insulated container as liquefied natural gas (LNG). This form of storage is at low pressure and is around 3.5 times as efficient as storing it as CNG.

Unlike propane, if a spill occurs, CNG will evaporate and dissipate because it is lighter than air.

Propane is much more commonly used to fuel vehicles than is natural gas, because that equipment costs less. Propane requires just 1,220 kilopascals (177 psi) of pressure to keep it liquid at 37.8 °C (100 °F).[46]

## Hazards

Propane is a simple asphyxiant.[47] Unlike natural gas, it is denser than air. It may accumulate in low spaces and near the floor. When abused as an inhalant, it may cause hypoxia (lack of oxygen), pneumonia, cardiac failure or cardiac arrest.[48][49] Propane has low toxicity since it is not readily absorbed and is not biologically active. Commonly stored under pressure at room temperature, propane and its mixtures will flash evaporate at atmospheric pressure and cool well below the freezing point of water. The cold gas, which appears white due to moisture condensing from the air, may cause frostbite.

Propane is denser than air. If a leak in a propane fuel system occurs, the vaporized gas will have a tendency to sink into any enclosed area and thus poses a risk of explosion and fire. The typical scenario is a leaking cylinder stored in a basement; the propane leak drifts across the floor to the pilot light on the furnace or water heater, and results in an explosion or fire. This property makes propane generally unsuitable as a fuel for boats. In 2007, a heavily investigated vapor-related explosion occurred in Ghent, West Virginia, U.S., killing four people and completely destroying the Little General convenience store on Flat Top Road, causing several injuries.[50][51]

Another hazard associated with propane storage and transport is known as a BLEVE or boiling liquid expanding vapor explosion. The Kingman Explosion involved a railroad tank car in Kingman, Arizona, U.S., in 1973 during a propane transfer. The fire and subsequent explosions resulted in twelve fatalities and numerous injuries.[52]

## Production

Propane is produced as a by-product of two other processes, natural gas processing and petroleum refining. The processing of natural gas involves removal of butane, propane, and large amounts of ethane from the raw gas, to prevent condensation of these volatiles in natural gas pipelines. Additionally, oil refineries produce some propane as a by-product of cracking petroleum into gasoline or heating oil.

The supply of propane cannot easily be adjusted to meet increased demand, because of the by-product nature of propane production. About 90% of U.S. propane is domestically produced.[36] The United States imports about 10% of the propane consumed each year, with about 70% of that coming from Canada via pipeline and rail. The remaining 30% of imported propane comes to the United States from other sources via ocean transport.

After it is separated from the crude oil, North American propane is stored in huge salt caverns. Examples of these are Fort Saskatchewan, Alberta; Mont Belvieu, Texas; and Conway, Kansas. These salt caverns[53] can store 80,000,000 barrels (13,000,000 m3) of propane.

### Retail cost

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#### United States

As of October 2013[update], the retail cost of propane was approximately $2.37 per gallon, or roughly $25.95 per 1 million BTUs.[54] This means that filling a 500-gallon propane tank, which is what households that use propane as their main source of energy usually require, cost $948 (80% of 500 gallons or 400 gallons), a 7.5% increase on the 2012–2013 winter season average US price.[55] However, propane costs per gallon change significantly from one state to another: the Energy Information Administration (EIA) quotes a $2.995 per gallon average on the East Coast for October 2013,[56] while the figure for the Midwest was $1.860 for the same period.[57]

As of December 2015[update], the propane retail cost was approximately $1.97 per gallon,[58] which meant filling a 500-gallon propane tank to 80% capacity cost $788, a 16.9% decrease or $160 less from November 2013. Similar regional differences in prices are present with the December 2015 EIA figure for the East Coast at $2.67 per gallon and the Midwest at $1.43 per gallon.[58]

As of August 2018[update], the average US propane retail cost was approximately $2.48 per gallon. The wholesale price of propane in the U.S. always drops in the summer as most homes do not require it for home heating. The wholesale price of propane in the summer of 2018 was between 86 cents to 96 cents per U.S. gallon, based on a truckload or railway car load. The price for home heating was exactly double that price; at 95 cents per gallon wholesale, a home-delivered price was $1.90 per gallon if ordered 500 gallons at a time. Prices in the Midwest are always less than in California. Prices for home delivery always go up near the end of August or the first few days of September when people start ordering their home tanks to be filled.[59]

## On other planets

Propane was first discovered in space in 1981 in the atmosphere of Saturn's moon Titan based on spectroscopic observations from the Voyager 1 IRIS instrument.[60] This was subsequently confirmed by ground-based observations using the TEXES instrument on the IRTF telescope[61] and mapped by the CIRS instrument on Cassini.[62]

Propane was subsequently been detected in the atmosphere of Saturn using TEXES,[63] and predicted but unconfirmed on Jupiter, Neptune and Uranus.

## See also

* Blau gas
* National Propane Gas Association

## References

1. ↑ "Fuels". https://www.globalfueleconomy.org/transport/gfei/autotool/approaches/technology/fuels.asp.
2. ↑ "The difference between butane and propane". Calor Gas Ltd UK. https://www.calor.co.uk/news-and-views/the-difference-between-butane-and-propane.
3. ↑ "Propane". https://vasa.org.au/transition-to-latest-ghs-7-chemical-id-system-starts-in-2021/.
4. ↑ (in fr) Comptes rendus hebdomadaires des séances de l'Académie des sciences. 140. Académie des Sciences. 1905. https://books.google.com/books?id=dzlCAQAAMAAJ&q=Berthelot+Propane+1857.
5. ↑ Acetylene and Its Polymers : 150+ Years of History, Seth C. Rasmussen, Springer, 2018, ISBN 978-3-319-95489-9, doi:10.1007/978-3-319-95489-9.
6. ↑ "Substitutions inverses", Marcellin Berthelot, pp. 48-58 in Annales de chimie et de physique, 3rd ser., 51, Paris : Victor Masson, 1857.
7. ↑ Roscoe, H.E.; Schorlemmer, C. (1881). Treatise on Chemistry. 3. Macmillan. pp. 144–145.
8. ↑ Watts, H. (1868). Dictionary of Chemistry. 4. pp. 385.
9. ↑ 9.0 9.1 9.2 9.3 National Propane Gas Association. "The History of Propane". http://www.npga.org/i4a/pages/index.cfm?pageid=634.
10. ↑ "Gas Plant in Steel Bottle – Dr. Snelling's Process Gives Month's Supply in Liquid Form.". The New York Times: p. 9. April 1, 1912.
11. ↑ "The First Fifty Years of LP-Gas: An Industry Chronology". LPGA Times. January 1962. http://www.npga.org/files/public/LPGA_Times_1962_History.pdf. , Page 17.
12. ↑ "Fact Sheet – The History of Propane". http://www.propanecouncil.org/newsroom/fact_sheetsDetail.cfv?id=5.
13. ↑ Puente, Victor (December 7, 2020). "Propane shortage: An unexpected side effect of the pandemic and restaurant mandates" (in en). https://www.wkyt.com/2020/12/07/propane-shortage-an-unexpected-side-effect-of-the-pandemic-and-restaurant-mandates/.
14. ↑ Lott, Jennifer (January 13, 2021). "Southwest Louisiana is experiencing a propane supply shortage". https://www.kplctv.com/2021/01/14/southwest-louisiana-is-experiencing-propane-supply-shortage/.
15. ↑ Peguero, Joshua (December 6, 2020). "Pandemic is creating an increase in demand for propane, as some homeowners struggle to get some". https://www.wbay.com/2020/12/06/pandemic-is-creating-an-increase-in-demand-for-propane-as-some-homeowners-struggle-to-get-some/.
16. ↑ "Online Etymology Dictionary entry for propane". Etymonline.com. http://www.etymonline.com/index.php?term=propane.
17. ↑ Webster's Revised Unabridged Dictionary. Springfield, Mass.: G. & C. Merriam. 1913. OCLC 800618302. http://www.websters1913.com/words/Propionic.
18. ↑ NIOSH [2021]. Odor fade in natural gas and propane. Morgantown, WV: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2021-106 (revised 01/2022).
19. ↑ "What to do if You Smell Propane Gas". https://portal.ct.gov/pura/gas-pipeline-safety/what-to-do-if--you-smell-propane-gas.
20. ↑ "geometry of crystalline propane". https://log-web.de/chemie/Start.htm?name=propaneCryst&lang=en.
21. ↑ "The melting point alternation in the short-chain n-alkanes: Single-crystal X-ray analyses of propane at 30 K and of n-butane to n-nonane at 90 K". Angew Chem Int Ed 38: 988–992. 1999. doi:10.1002/(SICI)1521-3773(19990401)38:7<988::AID-ANIE988>3.0.CO;2-0.
22. ↑ 22.0 22.1 Propane. NIST Standard Reference Data referring to Pittam, D. A.; Pilcher, G. (1972). "Measurements of heats of combustion by flame calorimetry. Part 8.—Methane, ethane, propane, n-butane and 2-methylpropane". Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases 68: 2224. doi:10.1039/f19726802224. and Rossini, F.D. (1934). "Calorimetric determination of the heats of combustion of ethane, propane, normal butane, and normal pentane". Bureau of Standards Journal of Research 12 (6): 735–750. doi:10.6028/jres.012.059. https://archive.org/details/calorimetricdete12673ross.
23. ↑ United States Energy Information Association. "How much carbon dioxide is produced when different fuels are burned". https://www.eia.gov/tools/faqs/faq.php?id=73&t=11.
24. ↑ Ҫengel, Yunus A.; Boles, Michael A. (2006). Thermodynamics: An Engineering Approach (Fifth ed.). McGraw Hill. p. 925. ISBN 978-0-07-288495-1.
25. ↑ Razmi, Amir (May 2019). "Propylene Production by Propane Dehydrogenation (PDH)". Engineering: 3. https://www.slideshare.net/AmirRazmi/propylene-production-by-propane-dehydrogenation-pdh.
26. ↑ Zivenko, Oleksiy (2019). "LPG Accounting Specificity During ITS Storage and Transportation". Measuring Equipment and Metrology 80 (3): 21–27. doi:10.23939/istcmtm2019.03.021. ISSN 0368-6418.
27. ↑ Başaran, Anıl (August 10, 2023). "Experimental investigation of R600a as a low GWP substitute to R134a in the closed-loop two-phase thermosyphon of the mini thermoelectric refrigerator" (in en-AU). Applied Thermal Engineering 211. doi:10.1016/j.applthermaleng.2022.118501. https://www.sciencedirect.com/science/article/abs/pii/S1359431122004550. Retrieved 2023-08-11.
28. ↑ Climate Change 2021 – The Physical Science Basis
29. ↑ "European Commission on retrofit refrigerants for stationary applications". http://ec.europa.eu/environment/ozone/pdf/hcfc_technical_meeting_summary.pdf.
30. ↑ Koch, Wendy (March 6, 2015). "Why Your Fridge Pollutes and How It's Changing". National Geographic. https://www.nationalgeographic.com/science/article/150306-why-your-fridge-pollutes-and-how-its-changing.
31. ↑

* "U.S. EPA hydrocarbon-refrigerants FAQ". Epa.gov. http://www.epa.gov/ozone/snap/refrigerants/hc12alng.html.
* Compendium of hydrocarbon-refrigerant policy statements, October 2006. vasa.org.au
* "MACS bulletin: hydrocarbon refrigerant usage in vehicles". http://www.autoacforum.com/MACS/HCwarning.pdf.
* "Society of Automotive Engineers hydrocarbon refrigerant bulletin". Sae.org. 2005-04-27. http://www.sae.org/news/releases/05hydrocarbon_warning.htm.
* "Shade Tree Mechanic on hydrocarbon refrigerants". Shadetreemechanic.com. 2005-04-27. http://www.shadetreemechanic.com/cc_hydrocarbon_refrigerants.htm.
* "Saskatchewan Labour bulletin on hydrocarbon refrigerants in vehicles". Labour.gov.sk.ca. 2010-06-29. http://www.labour.gov.sk.ca/Default.aspx?DN=2fb5ac24-d90e-4408-bf40-559793bd8e96.
* VASA on refrigerant legality & advisability. vasa.org.au
* "Queensland (Australia) government warning on hydrocarbon refrigerants". Energy.qld.gov.au. http://www.energy.qld.gov.au/zone_files/petroleum_pdf/safety_alert025.pdf.

32. ↑ "New South Wales (Australia) Parliamentary record, 16 October 1997". Parliament.nsw.gov.au. 1997-10-16. http://www.parliament.nsw.gov.au/prod/parlment/HansArt.nsf/V3Key/LA19971016015.
33. ↑ "New South Wales (Australia) Parliamentary record, 29 June 2000". Parliament.nsw.gov.au. http://www.parliament.nsw.gov.au/prod/parlment/hansart.nsf/V3Key/LC20000629051.
34. ↑ Everitt, Neil (2023-03-18). "Scientists back propane in heat pumps" (in en-GB). https://www.coolingpost.com/world-news/scientists-back-propane-in-heat-pumps/.
35. ↑ Kashtan, Yannai S.; Nicholson, Metta; Finnegan, Colin; Ouyang, Zutao; Lebel, Eric D.; Michanowicz, Drew R.; Shonkoff, Seth B. C.; Jackson, Robert B. (June 15, 2023). "Gas and Propane Combustion from Stoves Emits Benzene and Increases Indoor Air Pollution". Environmental Science & Technology 57 (26): 9653–9663. doi:10.1021/acs.est.2c09289. PMID 37319002. Bibcode: 2023EnST...57.9653K.
36. ↑ 36.0 36.1 "2016 Propane Market Outlook". Propane Education and Research Council. https://www.afdc.energy.gov/uploads/publication/2016_propane_market_outlook.pdf.
37. ↑ Council, Propane Education & Research. "Community Propane Systems | Propane.com" (in en). https://propane.com/propane-products/community-propane-systems/.
38. ↑ 38.0 38.1 "Autogas". PERC. http://www.propanecouncil.org/propane-as-fuel/.
39. ↑ "Facts About Propane: America's Exceptional Energy". National Propane Gas Association. April 2001. http://www.allpropanemowers.com/wp-content/uploads/2014/06/Facts_About_Propane.pdf.
40. ↑ Feng, Bohan; Wei, Yue-Chang; Song, Wei-Yu; Xu, Chun-Ming (2022). "A review on the structure-performance relationship of the catalysts during propane dehydrogenation reaction". Petroleum Science 19 (2): 819–838. doi:10.1016/j.petsci.2021.09.015. https://doi.org/10.1016/j.petsci.2021.09.015.
41. ↑ Stoye, Dieter (2000). "Ullmann's Encyclopedia of Industrial Chemistry". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a24_437.
42. ↑ "ASTM D1835 - 16 Standard Specification for Liquefied Petroleum (LP) Gases". http://www.astm.org/Standards/D1835.htm.
43. ↑ Amerigas. "Amerigas Material Safety Data Sheet for Odorized Propane". http://www.amerigas.com/pdfs/safe_eng.pdf.
44. ↑ Suburban Propane. "Suburban Propane Material Safety Data Sheet for Commercial Odorized Propane". http://www.suburbanpropane.com/safety/pdf/propane/SAF 5152 MATERIAL SAFETY DATA SHEET.pdf.
45. ↑ Mexican Ministry of Energy. "Liquefied Petroleum Gas Market Outlook 2008–2017". Mexican Ministry of Energy. http://www.energia.gob.mx/res/PE_y_DT/pub/LPG Outlook 2008-2017.pdf.
46. ↑ "Propane Vapor Pressure". 2005. http://www.engineeringtoolbox.com/propane-vapor-pressure-d_1020.html.
47. ↑ "Propane". The National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/idlh/74986.html. "Propane is a simple asphyxiant and does not present an IDLH hazard at concentrations below its lower explosive limit (LEL). The chosen IDLH is based on the LEL of 21,000 ppm rounded down to 20,000 ppm."
48. ↑ "Inhalants – Facts and Statistics". Greater Dallas Council on Alcohol & Drug Abuse. March 4, 2006. http://www.gdcada.org/statistics/inhalants.htm.
49. ↑ Reynolds, Corey (November 8, 2023). "How to Determine If a Death Was Caused By Inhalants". National Inhalant Prevention Coalition. https://nationaltasc.org/determine-death/.
50. ↑ "Little General Store Propane Explosion". US Chemical Safety and Hazard Investigation Board. September 25, 2008. https://www.csb.gov/little-general-store-propane-explosion/.
51. ↑ US Chemical Safety and Hazard Investigation Board (September 25, 2008). "Investigation Report:Little General Store-Propane Explosion (four killed, six injured)". https://www.csb.gov/assets/1/20/csbfinalreportlittlegeneral.pdf?13741.
52. ↑ "The Disaster Story". Kingman Historic District. http://kingmanhistoricdistrict.com/points-of-interest/firefighters-memorial-park/the-disaster-story.htm.
53. ↑ Argonne National Laboratory (1999). "Salt Cavern Information Center". http://web.ead.anl.gov/saltcaverns/uses/hcstorage/index.htm.
54. ↑ US Energy Information Administration (November 12, 2013). "Heating Oil and Propane Prices". http://www.eia.gov/dnav/pet/pet_pri_wfr_dcus_nus_m.htm.
55. ↑ Propane Deal (November 12, 2013). "Current Propane Prices". http://propanedeal.com/prices/current-propane-prices.
56. ↑ US Energy Information Administration (November 12, 2013). "East Coast Heating Oil and Propane Prices". http://www.eia.gov/dnav/pet/pet_pri_wfr_dcus_R10_m.htm.
57. ↑ US Energy Information Administration (November 12, 2013). "Midwest Heating Oil and Propane Prices". http://www.eia.gov/dnav/pet/pet_pri_wfr_dcus_R20_m.htm.
58. ↑ 58.0 58.1 US Energy Information Administration (December 12, 2015). "Residential Propane: Weekly Heating Oil and Propane Prices (October – March)". http://www.eia.gov/dnav/pet/pet_pri_wfr_a_epllpa_prs_dpgal_w.htm.
59. ↑ US Energy Information Administration (August 11, 2018). "Residential Propane: Weekly Heating Oil and Propane Prices (October – March)". http://www.eia.gov/dnav/pet/pet_pri_wfr_a_epllpa_prs_dpgal_w.htm.
60. ↑ Maguire, W. C.; Hanel, R. A.; Jennings, D. E.; Kunde, V. G.; Samuelson, R. E. (August 1981). "C3H8 and C3H4 in Titan's atmosphere" (in en). Nature 292 (5825): 683–686. doi:10.1038/292683a0. ISSN 0028-0836. https://www.nature.com/articles/292683a0.
61. ↑ Roe, H. G.; Greathouse, T. K.; Richter, M. J.; Lacy, J. H. (2003-11-01). "Propane on Titan" (in en). The Astrophysical Journal 597 (1): L65–L68. doi:10.1086/379816. ISSN 0004-637X. Bibcode: 2003ApJ...597L..65R. https://iopscience.iop.org/article/10.1086/379816.
62. ↑ Coustenis, A.; Jennings, D.E.; Nixon, C.A.; Achterberg, R.K.; Lavvas, P.; Vinatier, S.; Teanby, N.A.; Bjoraker, G.L. et al. (May 2010). "Titan trace gaseous composition from CIRS at the end of the Cassini–Huygens prime mission" (in en). Icarus 207 (1): 461–476. doi:10.1016/j.icarus.2009.11.027. Bibcode: 2010Icar..207..461C. https://linkinghub.elsevier.com/retrieve/pii/S0019103509004734.
63. ↑ Greathouse, T; Lacy, J; Bezard, B; Moses, J; Richter, M; Knez, C (March 2006). "The first detection of propane on Saturn" (in en). Icarus 181 (1): 266–271. doi:10.1016/j.icarus.2005.09.016. Bibcode: 2006Icar..181..266G. https://linkinghub.elsevier.com/retrieve/pii/S0019103505003647.

## External links

| Wikimedia Commons has media related to Propane.

|

* Canadian Propane Association
* Kaoru Fujimoto; Hiroshi Kaneko; Qianwen Zhang; Qingjie Ge; Xiaohong Li (2007). "Direct synthesis of propane/butane from synthesis gas". in Noronha, F.B.; Schmal, M.; Sousa-Aguiar, E.F.. Natural Gas Conversion VIII, Proceedings of the 8th Natural Gas Conversion Symposium. Studies in Surface Science and Catalysis. 167. Elsevier. pp. 349–354. doi:10.1016/S0167-2991(07)80156-X. ISBN 9780444530783. https://www.sciencedirect.com/science/article/pii/S016729910780156X. (syngas)
* International Chemical Safety Card 0319
* National Propane Gas Association (U.S.)
* NIOSH Pocket Guide to Chemical Hazards
* Propane Education & Research Council (U.S.)
* Propane Properties Explained Descriptive Breakdown of Propane Characteristics
* UKLPG: Propane and Butane in the UK
* US Energy Information Administration
* World LP Gas Association (WLPGA)

* v
* t
* e

Alkanes

* Methane (CH4)
* Ethane (C2H6)
* Propane (C3H8)
* Butane (C4H10)
* Pentane (C5H12)
* Hexane (C6H14)
* Heptane (C7H16)
* Octane (C8H18)
* Nonane (C9H20)
* Decane (C10H22)
* Undecane (C11H24)
* Dodecane (C12H26)
* Tridecane (C13H28)
* Tetradecane (C14H30)
* Pentadecane (C15H32)
* Hexadecane / Cetane (C16H34)
* Heptadecane (C17H36)
* Octadecane (C18H38)
* Nonadecane (C19H40)
* Icosane (C20H42)
* Heneicosane (C21H44)
* Tetracosane (C24H50)
* Nonacosane (C29H60)
* Hentriacontane (C31H64)

* Higher alkanes
* List of alkanes

* v
* t
* e

Binary compounds of hydrogen

Alkali metal (Group 1) hydrides|

* LiH
* NaH
* KH
* RbH
* CsH

Lithium hydride, LiH
ionic metal hydride

Beryllium hydride
Left (gas phase): BeH2
covalent metal hydride
Right: (BeH2)n (solid phase)
polymeric metal hydride

Borane and diborane
Left: BH3 (special conditions), covalent metalloid hydride
Right: B2H6 (standard conditions), dimeric metalloid hydride

Methane, CH4
covalent nonmetal hydride

Ammonia, NH3
covalent nonmetal hydride

Water, H2O
covalent nonmetal hydride

Hydrogen fluoride, HF
covalent nonmetal hydride

Alkaline (Group 2) earth hydrides|

| Monohydrides|

* BeH
* MgH
* CaH
* SrH
* BaH

|

Dihydrides|

* BeH2
* MgH2
* CaH2
* SrH2
* BaH2

|

Group 13 hydrides|

| Boranes|

* BH3
* B2H6
* B2H2
* B2H4
* B4H10
* B5H9
* B5H11
* B6H10
* B6H12
* B10H14
* B18H22

|

Alanes|

* AlH3
* Al2H6

|

Gallanes|

* GaH3
* Ga2H6

|

Indiganes|

* InH3
* In2H6

|

Thallanes|

* TlH3
* Tl2H6

|

Group 14 hydrides|

| Linear alkanes|

* CH4
* C2H6
* C3H8
* C4H10
* C5H12
* C6H14
* C7H16
* C8H18
* C9H20
* C10H22
* more...

|

Linear alkenes|

* C2H4
* C3H6
* C4H8
* C5H10
* C6H12
* C7H14
* C8H16
* C9H18
* C10H20
* more...

|

Linear alkynes|

* C2H2
* C3H4
* C4H6
* C5H8
* C6H10
* C7H12
* C8H14
* C9H16
* C10H18
* more...

|

Silanes|

* SiH4
* Si2H6
* Si3H8
* Si4H10
* Si5H12
* Si6H14
* Si7H16
* Si8H18
* Si9H20
* Si10H22
* more...

|

Silenes|

* Si2H4

|

Silynes|

* Si2H2
* SiH

|

Germanes|

* GeH4
* Ge2H6
* Ge3H8
* Ge4H10
* Ge5H12

|

Stannanes|

* SnH4
* Sn2H6

|

Plumbanes|

* PbH4

|

* CH
* CH2
* CH3
* C2H
* Cycloalkanes
* Cycloalkenes
* Annulenes
* Many more

Pnictogen (Group 15) hydrides|

| Azanes|

* NH3
* N2H4
* N3H5
* N4H6
* N5H7
* N6H8
* N7H9
* N8H10
* N9H11
* N10H12
* more...

|

Azenes|

* N2H2
* N3H3
* N4H4

|

Phosphanes|

* PH3
* P2H4
* P3H5
* P4H6
* P5H7
* P6H8
* P7H9
* P8H10
* P9H11
* P10H12
* more...

|

Phosphenes|

* P2H2
* P3H3
* P4H4

|

Arsanes|

* AsH3
* As2H4

|

Stibanes|

* SbH3

|

Bismuthanes|

* BiH3

|

* HN3
* NH
* radical

Hydrogen chalcogenides (Group 16 hydrides)|

| Polyoxidanes|

* H2O
* H2O2
* H2O3
* H2O4
* H2O5
* H2O6
* H2O7
* H2O8
* H2O9
* H2O10
* more...

|

Polysulfanes|

* H2S
* H2S2
* H2S3
* H2S4
* H2S5
* H2S6
* H2S7
* H2S8
* H2S9
* H2S10
* more...

|

Selanes|

* H2Se
* H2Se2

|

Tellanes|

* H2Te
* H2Te2

|

Polanes|

* PoH2

|

* HO
* HO2
* HO3
* H2O+–O–
* H2S=S
* (HS)2S+–S–
* HS
* HDO
* D2O
* T2O

Hydrogen halides (Group 17 hydrides)|

* HF
* HCl
* HBr
* HI
* HAt

Transition metal hydrides|

* ScH2
* YH2
* YH3
* TiH2
* ZrH2
* HfH2
* VH
* VH2
* NbH
* NbH2
* TaH
* CrH
* CrH2
* CrHx
* NiH
* PdHx (x < 1)
* FeH
* FeH2
* FeH5
* CuH
* ZnH2
* CdH2
* HgH2

Lanthanide hydrides|

* LaH2
* LaH3
* LaH10
* CeH2
* CeH3
* PrH2
* PrH3
* NdH2
* NdH3
* SmH2
* SmH3
* EuH2
* GdH2
* GdH3
* TbH2
* TbH3
* DyH2
* DyH3
* HoH2
* HoH3
* ErH2
* ErH3
* TmH2
* TmH3
* YbH2
* YbH2.5
* LuH2
* LuH3

Actinide hydrides|

* AcH2
* ThH2
* Th4H15
* PaH3
* UH3
* NpH2
* NpH3
* PuH2
* PuH3
* AmH2
* AmH3
* CmH2

* v
* t
* e

Fuel gas

Types|

| Manufactured fuel gas
(History)|

* Coal gas
* Coal gasification
* Underground coal gasification
* Biogas
* Blast furnace gas
* Blau gas
* Gasification
* Landfill gas
* Mond gas
* Pintsch gas
* Producer gas
* Regasification
* Syngas
* Water gas
* Wood gas

|

Natural gas|

* APG
* CBM
* CNG
* HCNG
* LNG
* NGC
* SNG
* Bio-SNG

LPG|

* Autogas
* Butane
* Propane

Infrastructure|

* Compressor station
* Gas carrier
* Gas holder
* Gas meter
* Gasworks
* Natural-gas processing
* Natural gas storage
* Odorizer
* Pipeline transport

Uses|

* Bunsen burner
* Gas burner
* Gas engine
* Gas heater
* Gas lighting
* Gas mantle
* Gas stove
* Gas turbine
* Pilot light

* v
* t
* e

E numbers

* Colors (E100–199)
* Preservatives (E200–299)
* Antioxidants & acidity regulators (E300–399)
* Thickeners, stabilisers & emulsifiers (E400–499)
* pH regulators & anticaking agents (E500–599)
* Flavour enhancers (E600–699)
* Miscellaneous (E900–999)
* Additional chemicals (E1100–1599)

* * *

* Waxes (E900–909)
* Synthetic glazes (E910–919)
* Improving agents (E920–929)
* Packaging gases (E930–949)
* Sweeteners (E950–969)
* Foaming agents (E990–999)

* * *

* Calcium peroxide (E930)
* Argon (E938)
* Helium (E939)
* Dichlorodifluoromethane (E940)
* Nitrogen (E941)
* Nitrous oxide (E942)
* Butane (E943a)
* Isobutane (E943b)
* Propane (E944)
* Oxygen (E948)
* Hydrogen (E949)

* v
* t
* e

Alternative fuel vehicles

Compressed-air engine|

* Compressed air car
* Compressed-air vehicle
* Tesla turbine

Electric motor|

* Battery-electric locomotive
* Battery electric vehicle
* Cater MetroTrolley
* Electric aircraft
* Electric bicycle
* Pedelec
* Electric boat
* Electric bus
* Battery electric bus
* Electric car
* List
* Electric truck
* Electric platform truck
* Electric vehicle
* Electric motorcycles and scooters
* Electric kick scooter
* Gyro flywheel locomotive
* Hybrid electric vehicle
* Hybrid train
* Motorized bicycle
* Neighborhood Electric Vehicle
* Plug-in electric vehicle
* List
* Plug-in hybrid electric vehicle
* Solar vehicle
* Solar car
* Solar bus

Biofuel ICE|

* Alcohol fuel
* Biodiesel
* Biogas
* Butanol fuel
* Common ethanol fuel mixtures
* E85
* Ethanol fuel
* Flexible-fuel vehicle
* Methanol economy
* Methanol fuel
* Wood gas

Hydrogen|

* Fuel cell vehicle
* Hydrogen economy
* Hydrogen vehicle
* Hydrogen internal combustion engine vehicle

Others|

* Autogas
* Hybrid electric vehicle
* Liquid nitrogen vehicle
* Natural gas vehicle
* Propane
* Steam car

Multiple-fuel|

* Bi-fuel vehicle
* Flexible-fuel vehicle
* Hybrid vehicle
* Multifuel
* Plug-in hybrid

Documentaries|

* Who Killed the Electric Car?
* What Is the Electric Car?
* Revenge of the Electric Car

See also|

* Wind-powered vehicle
* Zero-emissions vehicle

* v
* t
* e

GABAA receptor positive modulators

Alcohols|

* Brometone
* Butanol
* Chloralodol
* Chlorobutanol (cloretone)
* Ethanol (alcohol) (alcoholic drink)
* Ethchlorvynol
* Isobutanol
* Isopropanol
* Menthol
* Methanol
* Methylpentynol
* Pentanol
* Petrichloral
* Propanol
* tert-Butanol (2M2P)
* tert-Pentanol (2M2B)
* Tribromoethanol
* Trichloroethanol
* Triclofos
* Trifluoroethanol

Barbiturates|

* (-)-DMBB
* Allobarbital
* Alphenal
* Amobarbital
* Aprobarbital
* Barbexaclone
* Barbital
* Benzobarbital
* Benzylbutylbarbiturate
* Brallobarbital
* Brophebarbital
* Butabarbital/Secbutabarbital
* Butalbital
* Buthalital
* Butobarbital
* Butallylonal
* Carbubarb
* Crotylbarbital
* Cyclobarbital
* Cyclopentobarbital
* Difebarbamate
* Enallylpropymal
* Ethallobarbital
* Eterobarb
* Febarbamate
* Heptabarb
* Heptobarbital
* Hexethal
* Hexobarbital
* Metharbital
* Methitural
* Methohexital
* Methylphenobarbital
* Narcobarbital
* Nealbarbital
* Pentobarbital
* Phenallymal
* Phenobarbital
* Phetharbital
* Primidone
* Probarbital
* Propallylonal
* Propylbarbital
* Proxibarbital
* Reposal
* Secobarbital
* Sigmodal
* Spirobarbital
* Talbutal
* Tetrabamate
* Tetrabarbital
* Thialbarbital
* Thiamylal
* Thiobarbital
* Thiobutabarbital
* Thiopental
* Thiotetrabarbital
* Valofane
* Vinbarbital
* Vinylbital

Benzodiazepines|

* 2-Oxoquazepam
* 3-Hydroxyphenazepam
* Adinazolam
* Alprazolam
* Arfendazam
* Avizafone
* Bentazepam
* Bretazenil
* Bromazepam
* Brotizolam
* Camazepam
* Carburazepam
* Chlordiazepoxide
* Ciclotizolam
* Cinazepam
* Cinolazepam
* Clazolam
* Climazolam
* Clobazam
* Clonazepam
* Clonazolam
* Cloniprazepam
* Clorazepate
* Clotiazepam
* Cloxazolam
* CP-1414S
* Cyprazepam
* Delorazepam
* Demoxepam
* Diazepam
* Diclazepam
* Doxefazepam
* Elfazepam
* Estazolam
* Ethyl carfluzepate
* Ethyl dirazepate
* Ethyl loflazepate
* Etizolam
* EVT-201
* FG-8205
* Fletazepam
* Flubromazepam
* Flubromazolam
* Fludiazepam
* Flunitrazepam
* Flunitrazolam
* Flurazepam
* Flutazolam
* Flutemazepam
* Flutoprazepam
* Fosazepam
* Gidazepam
* Halazepam
* Haloxazolam
* Iclazepam
* Imidazenil
* Irazepine
* Ketazolam
* Lofendazam
* Lopirazepam
* Loprazolam
* Lorazepam
* Lormetazepam
* Meclonazepam
* Medazepam
* Menitrazepam
* Metaclazepam
* Mexazolam
* Midazolam
* Motrazepam
* N-Desalkylflurazepam
* Nifoxipam
* Nimetazepam
* Nitrazepam
* Nitrazepate
* Nitrazolam
* Nordazepam
* Nortetrazepam
* Oxazepam
* Oxazolam
* Phenazepam
* Pinazepam
* Pivoxazepam
* Prazepam
* Premazepam
* Proflazepam
* Pyrazolam
* QH-II-66
* Quazepam
* Reclazepam
* Remimazolam
* Rilmazafone
* Ripazepam
* Ro48-6791
* Ro48-8684
* SH-053-R-CH3-2′F
* Sulazepam
* Temazepam
* Tetrazepam
* Tolufazepam
* Triazolam
* Triflubazam
* Triflunordazepam (Ro5-2904)
* Tuclazepam
* Uldazepam
* Zapizolam
* Zolazepam
* Zomebazam

Carbamates|

* Carisbamate
* Carisoprodol
* Clocental
* Cyclarbamate
* Difebarbamate
* Emylcamate
* Ethinamate
* Febarbamate
* Felbamate
* Hexapropymate
* Lorbamate
* Mebutamate
* Meprobamate
* Nisobamate
* Pentabamate
* Phenprobamate
* Procymate
* Styramate
* Tetrabamate
* Tybamate

Flavonoids|

* 6-Methylapigenin
* Ampelopsin (dihydromyricetin)
* Apigenin
* Baicalein
* Baicalin
* Catechin
* EGC
* EGCG
* Hispidulin
* Linarin
* Luteolin
* Rc-OMe
* Skullcap constituents (e.g., baicalin)
* Wogonin

Imidazoles|

* Etomidate
* Metomidate
* Propoxate

Kava constituents|

* 10-Methoxyyangonin
* 11-Methoxyyangonin
* 11-Hydroxyyangonin
* Desmethoxyyangonin
* 11-Methoxy-12-hydroxydehydrokavain
* 7,8-Dihydroyangonin
* Kavain
* 5-Hydroxykavain
* 5,6-Dihydroyangonin
* 7,8-Dihydrokavain
* 5,6,7,8-Tetrahydroyangonin
* 5,6-Dehydromethysticin
* Methysticin
* 7,8-Dihydromethysticin
* Yangonin

Monoureides|

* Acecarbromal
* Apronal (apronalide)
* Bromisoval
* Carbromal
* Capuride
* Ectylurea

Neuroactive steroids|

* Acebrochol
* Allopregnanolone (brexanolone)
* Alfadolone
* Alfaxalone
* 3α-Androstanediol
* Androstenol
* Androsterone
* Certain anabolic-androgenic steroids
* Cholesterol
* DHDOC
* 3α-DHP
* 5α-DHP
* 5β-DHP
* DHT
* Etiocholanolone
* Ganaxolone
* Hydroxydione
* Minaxolone
* ORG-20599
* ORG-21465
* P1-185
* Pregnanolone (eltanolone)
* Progesterone
* Renanolone
* SAGE-105
* SAGE-324
* SAGE-516
* SAGE-689
* SAGE-872
* Testosterone
* THDOC
* Zuranolone

Nonbenzodiazepines|

* Cyclopyrrolones: Eszopiclone
* Pagoclone
* Pazinaclone
* Suproclone
* Suriclone
* Zopiclone

* Imidazopyridines: Alpidem
* DS-1
* Necopidem
* Saripidem
* Zolpidem

* Pyrazolopyrimidines: Divaplon
* Fasiplon
* Indiplon
* Lorediplon
* Ocinaplon
* Panadiplon
* Taniplon
* Zaleplon

* Others: Adipiplon
* CGS-8216
* CGS-9896
* CGS-13767
* CGS-20625
* CL-218,872
* CP-615,003
* CTP-354
* ELB-139
* GBLD-345
* Imepitoin
* JM-1232
* L-838,417
* Lirequinil (Ro41-3696)
* NS-2664
* NS-2710
* NS-11394
* Pipequaline
* ROD-188
* RWJ-51204
* SB-205,384
* SX-3228
* TGSC01AA
* TP-003
* TPA-023
* TP-13
* U-89843A
* U-90042
* Viqualine
* Y-23684

Phenols|

* Fospropofol
* Propofol
* Thymol

Piperidinediones|

* Glutethimide
* Methyprylon
* Piperidione
* Pyrithyldione

Pyrazolopyridines|

* Cartazolate
* Etazolate
* ICI-190,622
* Tracazolate

Quinazolinones|

* Afloqualone
* Cloroqualone
* Diproqualone
* Etaqualone
* Mebroqualone
* Mecloqualone
* Methaqualone
* Methylmethaqualone
* Nitromethaqualone
* SL-164

Volatiles/gases|

* Acetone
* Acetophenone
* Acetylglycinamide chloral hydrate
* Aliflurane
* Benzene
* Butane
* Butylene
* Centalun
* Chloral
* Chloral betaine
* Chloral hydrate
* Chloroform
* Cryofluorane
* Desflurane
* Dichloralphenazone
* Dichloromethane
* Diethyl ether
* Enflurane
* Ethyl chloride
* Ethylene
* Fluroxene
* Gasoline
* Halopropane
* Halothane
* Isoflurane
* Kerosine
* Methoxyflurane
* Methoxypropane
* Nitric oxide
* Nitrogen
* Nitrous oxide
* Norflurane
* Paraldehyde
* Propane
* Propylene
* Roflurane
* Sevoflurane
* Synthane
* Teflurane
* Toluene
* Trichloroethane (methyl chloroform)
* Trichloroethylene
* Vinyl ether

Others/unsorted|

* 3-Hydroxybutanal
* α-EMTBL
* AA-29504
* Avermectins (e.g., ivermectin)
* Bromide compounds (e.g., lithium bromide, potassium bromide, sodium bromide)
* Carbamazepine
* Chloralose
* Chlormezanone
* Clomethiazole
* DEABL
* Dihydroergolines (e.g., dihydroergocryptine, dihydroergosine, dihydroergotamine, ergoloid (dihydroergotoxine))
* DS2
* Efavirenz
* Etazepine
* Etifoxine
* Fenamates (e.g., flufenamic acid, mefenamic acid, niflumic acid, tolfenamic acid)
* Fluoxetine
* Flupirtine
* Hopantenic acid
* Lanthanum
* Lavender oil
* Lignans (e.g., 4-O-methylhonokiol, honokiol, magnolol, obovatol)
* Loreclezole
* Menthyl isovalerate (validolum)
* Monastrol
* Niacin
* Nicotinamide (niacinamide)
* Org 25,435
* Phenytoin
* Propanidid
* Retigabine (ezogabine)
* Safranal
* Seproxetine
* Stiripentol
* Sulfonylalkanes (e.g., sulfonmethane (sulfonal), tetronal, trional)
* Terpenoids (e.g., borneol)
* Topiramate
* Valerian constituents (e.g., isovaleric acid, isovaleramide, valerenic acid, valerenol)

* Unsorted benzodiazepine site positive modulators: α-Pinene
* MRK-409 (MK-0343)
* TCS-1105
* TCS-1205

See also: Receptor/signaling modulators • GABA receptor modulators • GABA metabolism/transport modulators

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Original source: https://en.wikipedia.org/wiki/Propane. Read more

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*[GABAA]: γ-Aminobutyric acid A