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AirScience - Amine Scrubbing Process System
Amine scrubbing or amine gas treating, also known as gas sweetening or acid gas removal, refers to a group of processes that use aqueous solutions of various alkylamines to remove hydrogen sulfide (H2S) and carbon dioxide (CO2) from gases. AirScience amine scrubbing process includes absorber and regenerator towers as well as accessory equipment such as pumps, heat exchangers, reboiler, etc.
In the absorber, the down-flowing amine solution absorbs H2S and CO2 from the up-flowing sour gas to produce a sweetened gas stream (i.e., a gas free of hydrogen sulfide and carbon dioxide) as a product exiting at the top of the tower and an amine solution rich in the absorbed acid gases collecting at the bottom of the tower.
The resultant "rich" amine is then routed into the regenerator (a stripper with a reboiler) to produce regenerated or "lean" amine that is recycled for reuse in the absorber.
The stripped overhead gas from the regenerator is concentrated H2S and CO2. In the case of biogas enrichment that stripped gas is mostly carbon dioxide.
