How to deal with high hydrogen sulfide levels in ammonia gas

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This post was last edited by dongliangsir on 2010-8-15 at 13:53. The acidic water stripping tower in our company operates with pressure-induced side-stream extraction; however, the hydrogen sulfide concentration in the ammonia stream after it is divided into three streams is quite high, which affects the emissions after combustion. We kindly ask experts for their guidance: Since the steam pressure in our company is 0.7 MP, and the concentrations of hydrogen sulfide and ammonia nitrogen in the feed water are both at 12,000 PPM, there is no coking involved； Our tower top pressure is generally 0.4 MPa, and the tower bottom temperature is 153 degrees. The side stream is taken out at layer 17, with a temperature of around 143–147 degrees. Currently, the hydrogen sulfide content in the ammonia gas is 600 ppm. I’m not sure whether the issue lies in the incorrect location of the side stream extraction point or in the inappropriate extraction temperature. I would appreciate advice on how to determine the appropriate extraction temperature for the side stream.