Patent ID: 7771685
Filing Date: 2010-08-10
Classification: B01D

Abstract:
1. A process of separating at least one of hydrogen sulfide and mercaptans from ammonia employed in a flue gas desulfurization system, the process comprising: absorbing acidic gases from a flue gas with a scrubbing media containing ammonium sulfate to produce a stream of scrubbed flue gas; collecting the scrubbing media containing the absorbed acidic gases; injecting into the collected scrubbing media a source of ammonia that is laden with at least one compound chosen from the group consisting of hydrogen sulfide and mercaptans, the injected ammonia being absorbed into and reacted with the collected scrubbing media; stripping the at least one compound from the collected scrubbing media by causing the at least one compound to exit the collected scrubbing media as stripped gases; and collecting the stripped gases of the at least one compound without allowing the stripped gases to enter the stream of scrubbed flue gas; wherein the source of ammonia is injected into the collected scrubbing media below a surface of the collected scrubbing media, and the process further comprises injecting an oxygen-containing gas into the collected scrubbing media at a location below where the source of ammonia is injected into the collected scrubbing media.