Gas separation

Short description: Techniques to provide multiple products or purify a product

Gas separation can refer to any of a number of techniques used to separate gases, either to give multiple products or to purify a single product.

## Contents

* 1 Swing adsorption techniques
* 1.1 Pressure swing adsorption
* 1.2 Vacuum swing adsorption
* 1.3 Temperature swing adsorption
* 2 Cryogenic distillation
* 3 See also
* 4 References

## Swing adsorption techniques

### Pressure swing adsorption

Main article: Physics:Pressure swing adsorption

Pressure swing adsorption (PSA) pressurizes and depressurizes a multicomponent gas around an adsorbent medium to selectively adsorb some components of a gas while leaving other components free-flowing.[1]

### Vacuum swing adsorption

Main article: Physics:Vacuum swing adsorption

Vacuum swing adsorption (VSA) uses the same principle as PSA but swings between vacuum pressures and atmospheric pressure.[2] PSA and VSA techniques may be combined and are called "vacuum pressure swing adsorption" (VPSA) in this case.

### Temperature swing adsorption

Temperature swing adsorption (TSA) is similar to other swing adsorption techniques but cycles the temperature of the adsorbent bed-gas system instead of the gas pressure to achieve separation.[2]

## Cryogenic distillation

Main article: Physics:Air separation

Cryogenic distillation is typically only used for very high volumes because of its nonlinear cost-scale relationship, which makes the process more economical at larger scales. Because of this it is typically only used for air separation.[3]

## See also

* Physics:Oxygen concentrator - Device that removes nitrogen from air
* Physics:Nitrogen generator - Air-to-nitrogen production complexes
* Chemistry:Industrial gas - Gaseous materials produced for use in industry
* Physics:Air separation - Chemical process
* Physics:Natural-gas processing - Industrial processes designed to purify raw natural gas
* Engineering:Solid sorbents for carbon capture

## References

1. ↑ Basu, Swapan; Debnath, Ajay (2019). PowerPlant Instrumentation and Control Handbook. ISBN 978-0-12-819504-8.
2. ↑ 2.0 2.1 Ntiamoah, AugustineExpression error: Unrecognized word "et". (18 September 2015). "CO2 capture by vacuum swing adsorption: role of multiple pressure equalization steps". Adsorption 21: 509-522. doi:10.1007/s10450-015-9690-8.
3. ↑ Hermes, Santa AnnaExpression error: Unrecognized word "et". (May 2016). "Methane/nitrogen separation through pressure swing adsorption process from nitrogen-rich streams". Chemical Engineering and Processing: Process Intensification 103: 70-79. doi:10.1016/j.cep.2015.11.002.

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