Patent ID: 7601315

Claim:
A process for recovering CO 2 from a feed gas stream comprising: a. treating the feed gas stream with a regenerated absorbent having a viscosity less than 15 centistokes that is selected from one the of the following groups: i. at least one polyamine in the absence of an effective amount of tertiary amine functionalities having a pKa sufficient to neutralize carbamic acid, the polyamine having at least one primary amine functionality having a pKa of <10.0 at 25° C. wherein and the feed gas stream has an SO 2 concentration less than 5 ppm vol.; and, ii. a polyamine in the absence of an effective amount of tertiary amine functionalities having a pKa sufficient to neutralize carbamic acid, the polyamine having at least one secondary amine functionality having a pKa for each sorbing nitrogen of <10.0 at 25° C. to obtain a spent absorbent and a CO 2 lean gas stream; b. conveying the CO 2 rich amine absorbent to a regeneration zone; and, c. regenerating the absorbent by steam stripping, wherein the steam stripping is conducted using from 1.0 to 2.0 pounds of steam per pound of CO 2 absorbed.