Gas separation
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.
Swing adsorption techniques[edit]
Pressure swing adsorption[edit]
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[edit]
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[edit]
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[edit]
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[edit]
- Oxygen concentrator – Device that removes nitrogen from air
- Nitrogen generator
- Industrial gas – Gaseous materials produced for use in industry
- Air separation – Chemical process
- Natural-gas processing – Industrial processes designed to purify raw natural gas
- Solid sorbents for carbon capture – Solid materials that can adsorb carbon dioxide from air.
References[edit]
- ^ Basu, Swapan; Debnath, Ajay (2019). PowerPlant Instrumentation and Control Handbook. ISBN 978-0-12-819504-8.
- ^ a b Ntiamoah, Augustine; Ling, Jianghua; et al. (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.
- ^ Hermes, Santa Anna; Amaro, Barreto; et al. (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.