Patent ID: 7985331

Claim:
Method for eliminating carbonyl sulfide contained in a liquid hydrocarbon stream that is at least a part of a liquid condensate obtained by a natural gas treatment process comprising the following steps: a) the natural gas is made to contact an absorbent liquid so as to absorb CO 2 and H 2 S and obtain a purified natural gas, b) the purified natural gas is dehydrated, c) the dehydrated natual gas is cooled so as to obtain the liquid condensate and a gas fraction, and d) the liquid condensate and an aqueous alkanolamine solution are introduced into a membrane contactor provided with at least one porous membrane, the aqueous alkanolamine solution being separated from the liquid condensate by the at least one porous membrane and being brought into contact with the liquid condensate at interfaces located on pores at the surface of the at least one porous membrane such that the carbonyl sulfide contained in the liquid condensate migrates into the aqueous solution having between 50 and 80 wt. % water and between 20 and 50 wt. % alkanolamines, and wherein the aqueous solution containing carbonyl sulfide and the carbonyl sulfide-impoverished liquid condensate are evacuated from the membrane contactor.