REMOVING NH3 AND H2S FROM VAPOUR STREAM

摘要

A process for the removal of hydrogen sulfide and ammonia from a vapor stream, and from a dilute aqueous solution containing free and fixed ammonia salts and acid gases comprises scrubbing the vapor stream in a scrubber (202) by contacting it with an aqueous ammonia solution, subjecting the dilute aqueous solution to a free and fixed ammonia still process (214, 224) passing an overhead vapor stream from the second still (224) through an indirect heat exchanger (226a) to heat the liquid in the first still (214) and then passing the overhead vapor stream to the scrubber (202) for the removal of the hydrogen sulfide.