Method for removing carbonyl sulfide in gas treating processes

Details Method for removing carbonyl sulfide in gas treating processes Method for removing carbonyl sulfide in gas treating processes

B - Operations, Transporting

01

D

23/343

B01D 53/14 (2006.01) B01D 53/34 (2006.01)

Patent

CA 1149136

Abstract Gas streams containing carbonyl sulfide are contacted with an aqueous alkanolamine hydrolysis medium flowing through a closed-loop hydrolysis zone at a temperature sufficient to hydrolyze, in the presence of water, carbonyl sulfide to hydrogen sulfide and carbon dioxide. The aqueous alkaline hydrolysis medium is in equilibrium with hydrogen sulfide and carbon dioxide. As a consequence, the formed hydrogen sulfide and carbon dioxide pass through the closed-loop hydrolysis zone and at least the hydrogen sulfide is extracted from the gas stream by contact with a second acid gas lean absorbent. The gas stream may be pre-treated to remove hydrogen sulfide, carbon dioxide, or both.

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