US 2011/0217218 A1Published application

Systems and Methods for Acid Gas Removal

AssigneeExxonMobil Research and Engineering Company

InventorsRamesh Gupta, Krishnan Sankaranarayanan, Himanshu Gupta, Benjamin A. McCool, Robert B. Fedich, Richard D. Lenz

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Abstract

A method and system for the selective removal of CO2 and/or H2S from a gaseous stream containing one or more acid gases. In particular, a system and method for separating CO2 and/or H2S from a gas mixture containing an acid gas using an absorbent solution and one or more ejector venturi nozzles in flow communication with one or more absorbent contactors. The method involves contacting a gas mixture containing at least one acid gas with the absorbent solution under conditions sufficient to cause absorption of at least a portion of said acid gas. The absorbent contactors operate in co-current flow and are arranged in a counter-current configuration to increase the driving force for mass transfer. Monoliths can be used that operate in a Taylor flow or slug flow regime. The absorbent solution is treated under conditions sufficient to cause desorption of at least a portion of the acid gas.

Claims20

Dependent claims

A method of separating an acid gas component from a feed gas mixture comprising an acid gas, such method comprising:

providing at least one liquid spray device in flow communication with at least one absorbent contactor, and at least one gas feed inlet line in flow communication with said at least one absorbent contactor, wherein said absorbent contactor is comprised of a at least one of a monolithic or packed bed;
contacting in said absorbent contactor in co-current flow at least a portion of a feed gas mixture containing at least one acid gas with at least a portion of a first absorbent solution under conditions sufficient to cause absorption of at least a portion of said acid gas, wherein said acid gas is comprised of CO2, H2S or a combination thereof;
removing a first partially scrubbed gas mixture from said absorbent contactor, wherein the molar concentration of acid gas in said first partially scrubbed gas mixture is less than the molar concentration of said acid gas in said feed gas mixture;
and
removing a stream of a first spent absorbent solution from said absorbent contactor, which first spent absorbent solution contains at least a portion of the acid gas from the feed gas mixture.

2 more elements

A method of separating an acid gas component from a feed gas mixture comprising and acid gas, such method comprising:

providing at least a first ejector venturi nozzle in flow communication with at least a first absorbent contactor, and at least a second ejector venturi nozzle in flow communication with at least a second absorbent contactor;
said first absorbent contactor in flow communication with said second ejector venturi nozzle and said second absorbent contactor in flow communication with said first ejector venturi nozzle;
ejecting a first ejector stream comprising liquid droplets from said first ejector venturi nozzle into said first absorbent contactor, said first ejector stream comprising a first absorbent solution and a first feed gas mixture containing at least one acid gas;
contacting in said first absorbent contactor in co-current flow at least a portion of said first feed gas mixture containing at least one acid gas with at least a portion of said first absorbent solution under conditions sufficient to cause absorption of at least a portion of said acid gas, wherein said acid gas is comprised of CO2, H2S or a combination thereof;
removing a first partially scrubbed gas mixture from said first absorbent contactor, wherein the molar concentration of said acid gas in said first partially scrubbed gas mixture is less than the molar concentration of said acid gas in said first feed gas mixture;
ejecting a second ejector stream comprising liquid droplets from said second ejector venturi nozzle into said second absorbent contactor, said second ejector stream comprising a second absorbent solution and a second feed gas mixture containing at least a portion of said first partially scrubbed gas mixture from said first absorbent contactor;
contacting in said second absorbent contactor in co-current flow at least a portion of said first partially scrubbed gas mixture with at least a portion of said second absorbent solution under conditions sufficient to cause absorption of at least a portion of said acid gas from said first partially scrubbed gas mixture;
and
removing a stream of a second spent absorbent solution from said second absorbent contactor, which said second spent absorbent solution contains at least a portion of said acid gas from said first partially scrubbed gas mixture.

6 more elements

Dependencies are inferred from the claim text.