Process for capturing sulfur dioxide from a gas stream
First Claim
1. A process for removing sulfur dioxide from a feed gas stream, which process comprises:
- (i) contacting the feed gas stream with an aqueous lean absorbing medium to absorb sulfur dioxide and to form a sulfur dioxide lean treated gas stream and a spent absorbing medium;
wherein the aqueous lean absorbing medium comprises;
(a) a chemical solvent comprising a regenerable absorbent,(b) a physical solvent, and(c) one or more heat stable salts;
wherein the regenerable absorbent is an amine;
wherein the ratio of the weight percentage of the physical solvent in the lean absorbing medium over that of the regenerable absorbent is in the range of from 0.5 to 2.5;
wherein the ratio of the weight percentage of heat stable salts in the lean absorbing medium over that of the regenerable absorbent is in the range of from 0.29 to 0.37; and
wherein the pH of the lean absorbing medium is 6 or less.
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Abstract
A process for removing sulfur dioxide from a feed gas stream, which comprises (i) contacting the feed gas stream with an aqueous lean absorbing medium comprising a chemical solvent comprising a regenerable absorbent, a physical solvent, and one or more heat stable salts. The regenerable absorbent is an amine. The ratio of the wt % of the physical solvent over that of the regenerable absorbent is 0.5 to 2.5. The ratio of the wt % of heat stable salts over that of the regenerable absorbent is 0.29 to 0.37. The pH of the lean absorbing medium is 6 or less. With the process SO2 can be selectively removed. When the absorbing medium is stripped, a reduced amount of energy is required as compared to known processes.
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Citations
15 Claims
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1. A process for removing sulfur dioxide from a feed gas stream, which process comprises:
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(i) contacting the feed gas stream with an aqueous lean absorbing medium to absorb sulfur dioxide and to form a sulfur dioxide lean treated gas stream and a spent absorbing medium; wherein the aqueous lean absorbing medium comprises; (a) a chemical solvent comprising a regenerable absorbent, (b) a physical solvent, and (c) one or more heat stable salts; wherein the regenerable absorbent is an amine; wherein the ratio of the weight percentage of the physical solvent in the lean absorbing medium over that of the regenerable absorbent is in the range of from 0.5 to 2.5; wherein the ratio of the weight percentage of heat stable salts in the lean absorbing medium over that of the regenerable absorbent is in the range of from 0.29 to 0.37; and wherein the pH of the lean absorbing medium is 6 or less. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification