Carbon dioxide recovery from flue gas and the like
First Claim
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1. A method for recovering carbon dioxide from a carbon dioxide containing gas comprising:
- (A) passing a feed gas comprising carbon dioxide and oxygen in countercurrent contact with an absorbent solution comprising water, an amine component, and an organic component selected from the group consisting of C1-C3 alkanols, ethylene glycol, ethylene glycol monomethyl ether, diethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycols and polyethylene glycol ethers of the formula R4—
O—
(C2H4O)n—
R5 wherein n is 3 to 12, R4 is hydrogen or methyl, R5 is hydrogen or methyl, or R4 is phenyl and R5 is hydrogen, polypropylene glycols and polypropylene glycol ethers of the formula R6—
O—
(C3H6O)p—
R7 wherein n is 3 to 6, R6 is hydrogen or methyl, R7 is hydrogen or methyl, or R6 is phenyl and R7 is hydrogen, acetamide which is unsubstituted or N-substituted with one or two alkyl groups containing 1 or 2 carbon atoms, glycerol, sulfolane, dimethylsulfoxide, and mixtures thereof, and transferring carbon dioxide and oxygen from said gas into said absorbent solution to obtain a carbon dioxide and oxygen containing absorbent solution;
(B) separating oxygen from the carbon dioxide and oxygen containing absorbent solution to obtain an oxygen depleted carbon dioxide containing absorbent solution;
(C) heating the oxygen depleted carbon dioxide containing absorbent solution to obtain a heated oxygen depleted carbon dioxide containing absorbent solution; and
(D) separating carbon dioxide from the heated oxygen depleted carbon dioxide containing absorbent solution to obtain a carbon-dioxide-rich stream and a regenerated absorbent solution.
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Abstract
Carbon dioxide is recovered in concentrated form from a gas feed stream also containing oxygen by absorbing carbon dioxide and oxygen into an amine solution that also contains another organic component, removing oxygen, and recovering carbon dioxide from the absorbent.
54 Citations
18 Claims
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1. A method for recovering carbon dioxide from a carbon dioxide containing gas comprising:
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(A) passing a feed gas comprising carbon dioxide and oxygen in countercurrent contact with an absorbent solution comprising water, an amine component, and an organic component selected from the group consisting of C1-C3 alkanols, ethylene glycol, ethylene glycol monomethyl ether, diethylene glycol, propylene glycol, dipropylene glycol, polyethylene glycols and polyethylene glycol ethers of the formula R4—
O—
(C2H4O)n—
R5 wherein n is 3 to 12, R4 is hydrogen or methyl, R5 is hydrogen or methyl, or R4 is phenyl and R5 is hydrogen, polypropylene glycols and polypropylene glycol ethers of the formula R6—
O—
(C3H6O)p—
R7 wherein n is 3 to 6, R6 is hydrogen or methyl, R7 is hydrogen or methyl, or R6 is phenyl and R7 is hydrogen, acetamide which is unsubstituted or N-substituted with one or two alkyl groups containing 1 or 2 carbon atoms, glycerol, sulfolane, dimethylsulfoxide, and mixtures thereof, and transferring carbon dioxide and oxygen from said gas into said absorbent solution to obtain a carbon dioxide and oxygen containing absorbent solution;
(B) separating oxygen from the carbon dioxide and oxygen containing absorbent solution to obtain an oxygen depleted carbon dioxide containing absorbent solution;
(C) heating the oxygen depleted carbon dioxide containing absorbent solution to obtain a heated oxygen depleted carbon dioxide containing absorbent solution; and
(D) separating carbon dioxide from the heated oxygen depleted carbon dioxide containing absorbent solution to obtain a carbon-dioxide-rich stream and a regenerated absorbent solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification