Patent ID: 9192888
Filing Date: 2015-11-24
Classification: B01D

Abstract:
1. A method for removing acid gas from sour gas, the method comprising the steps of: separating the acid gas from the sour gas with an absorbent solvent in an absorption zone to form a treated gas stream that includes entrained absorbent solvent and that is at a first predetermined temperature of less than about 0° C.; heating the treated gas stream to a second predetermined temperature of greater than about 0° C. to form a partially heated treated gas stream; introducing the partially heated treated gas stream to a water wash zone to remove the entrained absorbent solvent with water and form a solvent-depleted treated gas stream; cooling a sour gas stream to a third predetermined temperature using the solvent-depleted treated gas stream, the treated gas stream, a cooler, or a combination thereof to form a cooled sour gas stream; and introducing the cooled sour gas stream to the absorption zone; wherein the step of cooling comprises indirect heat exchanging from the sour gas stream to the treated gas stream in a first heat exchanger to form the cooled sour gas stream and the partially heated treated gas stream and wherein the step of cooling comprises indirect heat exchanging from the sour gas stream to the solvent-depleted treated gas stream in a second heat exchanger upstream from the first heat exchanger to form a partially cooled sour gas stream and a heated solvent-depleted treated gas stream, and wherein the step of indirect heat exchanging from the sour gas stream to the treated gas stream comprises indirect heat exchanging from the partially cooled sour gas stream to the treated gas stream to form the cooled sour gas stream.