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US 7,527,775 B2Granted
CO2 removal from gas using ionic liquid absorbents
AssigneeChevron U.S.A. Inc.
InventorsDaniel Chinn, De Q. Vu, Michael S. Driver, Laura C. Boudreau
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Abstract
A process and method for separating CO2 from a gaseous stream such as natural gas. An ionic liquid comprising an anion having a carboxylate function and an effective amount of water is used as an adsorbent to selectively complex the CO2 yielding a gaseous stream with a greatly reduced CO2 content. The ionic liquid can then be readily be regenerated and recycled.
Claims20
A process for removal of CO2 from gaseous streams, comprising:
- contacting a CO2 containing gaseous stream with an absorbent comprising from 1 to 20 wt % water and an ionic liquid comprising a cation and an anion comprising a carboxylate moiety;
- said contacting occurring at absorption conditions, to absorb at least a portion of the CO2 from the CO2 containing gaseous stream and forming a CO2-absorbent complex;
- and
- recovering a gaseous product having a reduced CO2 content.
1 more element
A method of separating CO2 from a hydrocarbon containing gas, comprising:
- a. contacting a gas comprising CO2 and hydrocarbon with an absorbent comprising from 1 to 20 wt % water and an ionic liquid comprising a cation and an anion having a carboxylate function, at absorption conditions, to form a CO2 complex;
- b. recovering an effluent comprising hydrocarbon gas depleted in CO2;
- and
- c. subjecting the CO2 complex to desorption conditions to form a stream comprising CO2 and a stream comprising recycled absorbent.
1 more element
Dependencies are inferred from the claim text.