Removal of a target gas from a mixture of gases by swing adsorption with use of a turboexpander
First Claim
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1. A process for removing a target gas component from a gas mixture containing said target gas component and a product gas component, which process comprises:
- a) conducting said gas mixture to a turboexpander wherein the volume of said gas mixture is expanded, thereby lowering its pressure;
b) conducting said lowered pressure gas mixture from said turboexpander to a swing adsorption gas separation unit wherein said gas separation unit contains an adsorbent contactor comprised of an effective microporous adsorbent material for removing at least a portion of said target gas component from said gas mixture by adsorbing at least a portion of said target gas component onto said adsorbent material;
c) producing a product gas stream with a lower mol % of said target gas component than said gas mixture and a higher mol % of said product gas component than said gas mixture;
d) collecting said the product gas stream;
e) desorbing at least a portion of the adsorbed target gas component from said adsorbent material, thereby resulting in a waste gas stream which has a higher mol % of said target gas component than said gas mixture; and
f) collecting said waste gas stream;
wherein the product gas component is CH4 and the gas mixture is comprised of natural gas.
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Abstract
The separation of a target gas selected from a high pressure gas mixture containing said target gas as well as a product gas using a swing adsorption process unit. A turboexpander is used upstream of the swing adsorber to reduce the pressure of the high pressure gas mixture. A compressor is optionally used downstream of the swing adsorber to increase the pressure of the target gas-containing stream for injecting into a subterranean formation.
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Citations
28 Claims
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1. A process for removing a target gas component from a gas mixture containing said target gas component and a product gas component, which process comprises:
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a) conducting said gas mixture to a turboexpander wherein the volume of said gas mixture is expanded, thereby lowering its pressure; b) conducting said lowered pressure gas mixture from said turboexpander to a swing adsorption gas separation unit wherein said gas separation unit contains an adsorbent contactor comprised of an effective microporous adsorbent material for removing at least a portion of said target gas component from said gas mixture by adsorbing at least a portion of said target gas component onto said adsorbent material; c) producing a product gas stream with a lower mol % of said target gas component than said gas mixture and a higher mol % of said product gas component than said gas mixture; d) collecting said the product gas stream; e) desorbing at least a portion of the adsorbed target gas component from said adsorbent material, thereby resulting in a waste gas stream which has a higher mol % of said target gas component than said gas mixture; and f) collecting said waste gas stream; wherein the product gas component is CH4 and the gas mixture is comprised of natural gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification