Oxygen selective adsorbents
First Claim
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1. A method for separating oxygen from air comprising the steps of:
- (1) pressurizing an adsorbent bed containing an oxygen selective adsorbent comprising a porous carbon substrate impregnated with an acidic species;
(2) passing a pressurized air stream over said adsorbent bed;
(3) adsorbing oxygen from said pressurized air stream to produce a nitrogen enriched stream;
(4) withdrawing said nitrogen enriched stream from said adsorbent bed;
(5) stopping the flow of said pressurized air stream;
(6) depressurizing said adsorbent bed; and
(7) repeating steps 1 through 6 in a cyclic fashion.
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Abstract
An oxygen selective adsorbent and a method for making an oxygen selective adsorbent wherein a porous carbon substrate such as a carbon molecular sieve, activated carbon, carbon black, coal, or petroleum coke, is impregnated with a solution of an acidic species and the impregnated substrate is dried. The oxygen selective adsorbent can be used in a pressure swing adsorption process for the separation of oxygen from nitrogen, for example, in air.
28 Citations
12 Claims
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1. A method for separating oxygen from air comprising the steps of:
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(1) pressurizing an adsorbent bed containing an oxygen selective adsorbent comprising a porous carbon substrate impregnated with an acidic species; (2) passing a pressurized air stream over said adsorbent bed; (3) adsorbing oxygen from said pressurized air stream to produce a nitrogen enriched stream; (4) withdrawing said nitrogen enriched stream from said adsorbent bed; (5) stopping the flow of said pressurized air stream; (6) depressurizing said adsorbent bed; and (7) repeating steps 1 through 6 in a cyclic fashion. - View Dependent Claims (2, 3, 4)
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- 5. An oxygen selective adsorbent comprising a carbon molecular sieve impregnated with an acidic species.
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9. A method for making an oxygen selective adsorbent comprising:
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(a) impregnating a carbon molecular sieve with a solution of an acidic species; and (b) drying the impregnated carbon molecular sieve to form said oxygen selective adsorbent. - View Dependent Claims (10, 11, 12)
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Specification