D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 11/12 (2006.01) B01D 53/14 (2006.01) B01D 53/34 (2006.01) B01D 53/52 (2006.01) C01B 17/16 (2006.01) D21C 11/00 (2006.01) D21C 11/06 (2006.01)
Patent
CA 2156617
A method of separating sulphur compounds out of a gas containing carbon dioxide and hydrogen sulphide, in a gas washing system, said gas being obtained by gasification of spent cellulose liquor. According to the invention the gas washing system has a gas-liquid contact zone (5) operating at a pressure exceeding atmospheric pressure as well as a regeneration zone (8) operating at a pressure substantially less than the pressure in the gas-liquid contact zone (5). The carbon dioxide partial pressure in the gas prior to entering the gas-liquid contact zone exceeds 0.2 atm. Furthermore the gas comes into contact with an alkaline absorption liquid in the gas-liquid contact zone, and alkaline liquid containing alkali hydrogen sulphide is withdrawn from the gas-liquid contact zone and transferred to the regeneration zone, in which zone hydrogen sulphide is expelled from said liquid containing alkali hydrogen sulphide and withdrawn in the form of a gas.
Chemrec Aktiebolag
Fetherstonhaugh & Co.
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