B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/346
B01D 53/34 (2006.01) B01D 53/14 (2006.01) C01B 17/16 (2006.01) C01C 1/12 (2006.01) C10K 1/12 (2006.01)
Patent
CA 1151399
ABSTRACT The invention is concerned with a method of scrubbing H2S from coke-oven gas using the sulphur-ammonia method, wherein hydrogen sulphide is removed in an H2S scrubber using ammonia water, the ammonia in the coke-oven gas is removed by washing with water and the washing liquid flowing from the H2S scrubber is supplied to the top of a deacidifier in which hydrogen sulphide is expelled from an NH3 stripper, using water vapour and, if required, NH3 vapour, and is further treated, the flow from the deacidifier is recycled to the top of the H2S scrubber, the plant includ- ing a scrubbing tower having a bottom part which receives the H2S-containing vapour driven off by the deacidifier when the plant for processing the aforementioned vapour is not in operation; the vapour being washed with cool water in the scrubbing tower to produce strong liquor and the gas leaving the top of the scrubber being supplied to the coke-oven gas for purification. The method of the invention is characterized in that during normal operation, when the vapour leaving the deacidifier is further treated, the scrubbing tower is used to strip ammonia from the recycled liquor coming from the deacidifier, part of the stream of recycled liquor being conveyed from the top and middle of the tower downwards, and being treated in countercurrent by part of the coke-oven gas from the NH3 scrubber, whereupon the liquid flowing from the scrubbing tower is added to the recycled liquor supplied to the top of the H2S scrubber, and the NH3 stripped by the coke- oven gas is supplied to approximately the middle of the H2S scrubber. Since ammonia is removed from the recycled water leaving the deacidifier and supplied to the top of the H2S scrubber, there is a reduction in the concentration of NH3 in the washing liquor, so that it can absorb more NH3 from the gas for purification. Since gaseous ammonia is returned to the middle of the H2S scrubber, the NH3 concentration of the gas is increased, thus favouring the selective washing-out of H2S.
374576
Otto (dr. C.) & Comp. G.m.b.h
Swabey Ogilvy Renault
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