Regenerative recovery of contaminants from effluent gases

摘要

A contaminant gas is removed from a feed gas in two absorption and stripping circuits operated in tandem. The gas is first passed through a rich gas absorber producing a rich absorption liquor from which contaminant gas is stripped in a rich liquor stripper. A lean gas exiting the rich gas absorber is passed through a lean gas absorber, producing a lean absorption liquor from which contaminant gas is stripper in a lean liquor stripper. Regenerated absorption media exiting the respective strippers are recirculated to the respective absorbers.

主权项

1. A process for removing a contaminant gas from source gas and recovering the contaminant gas, the process comprising:
contacting a feed gas stream comprising the source gas in a rich gas absorber with a rich gas aqueous absorption medium comprising a sorbent for a contaminant gas, thereby absorbing contaminant gas from the feed gas stream into the absorption medium and producing a lean gas from which contaminant gas has been removed and a rich absorption liquor containing sorbed contaminant; contacting the lean gas exiting said rich gas absorber in a lean gas absorber with a lean gas aqueous absorption medium comprising a sorbent for the contaminant gas, thereby absorbing residual contaminant gas from the lean gas into the lean gas absorption medium and producing an exhaust gas from which additional contaminant gas has been removed and a lean absorption liquor containing sorbed contaminant; heating said rich absorption liquor in a rich liquor stripper to desorb said contaminant from said rich liquor and thereby produce a regenerated rich gas absorption medium and a rich liquor stripper gas effluent from said rich liquor stripper, said rich liquor stripper gas comprising water vapor and contaminant gas; heating said lean absorption liquor in a lean liquor stripper to desorb contaminant gas from said lean liquor and thereby produce a regenerated lean gas absorption medium and a lean liquor stripper gas effluent from said lean liquor stripper, said lean stripper gas comprising water vapor and said contaminant gas; and recirculating said regenerated rich gas absorption medium to said rich gas absorber for removal of contaminant gas from further flow of said feed gas and said regenerated lean gas absorption medium to said lean gas absorber for removal of contaminant gas from further flow of lean gas.