Acidic gas capture by diamines
First Claim
Patent Images
1. An aqueous composition comprising:
- a diamine in an amount of from about 4 to about 20 moles/kg of water; and
carbon dioxide in an amount of from about 0.3 to about 0.9 moles carbon dioxide per mole of the diamine.
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Abstract
Compositions and methods related to the removal of acidic gas. In particular, the present disclosure relates to a composition and method for the removal of acidic gas from a gas mixture using a solvent comprising a diamine (e.g., piperazine) and carbon dioxide. One example of a method may involve a method for removing acidic gas comprising contacting a gas mixture having an acidic gas with a solvent, wherein the solvent comprises piperazine in an amount of from about 4 to about 20 moles/kg of water, and carbon dioxide in an amount of from about 0.3 to about 0.9 moles per mole of piperazine.
14 Citations
27 Claims
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1. An aqueous composition comprising:
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a diamine in an amount of from about 4 to about 20 moles/kg of water; and carbon dioxide in an amount of from about 0.3 to about 0.9 moles carbon dioxide per mole of the diamine. - View Dependent Claims (2, 3, 4, 5)
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6. A method for reducing the volatility of a diamine comprising:
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providing a solvent that comprises a diamine in an amount of from about 4 to about 20 moles/kg of water; and adding carbon dioxide to the solvent in an amount of from about 0.3 to about 0.9 moles per mole of diamine. - View Dependent Claims (7, 8, 9)
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- 10. A method for increasing the solubility of a solid diamine comprising providing a diamine to a solution of from about 0.3 to about 0.9 moles carbon dioxide per mole of the diamine.
- 13. A method comprising contacting a gas mixture comprising an acidic gas with a solvent, wherein the solvent comprises a diamine in an amount of from about 4 to about 20 moles/kg of water.
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17. A method comprising:
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contacting a gas mixture comprising an acidic gas with a solvent, wherein the solvent comprises a diamine in an amount of from about 4 to about 20 moles/kg of water; and allowing the acidic gas to transfer from the gas mixture to the solvent. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method comprising:
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contacting a gas mixture comprising an acidic gas with a solvent in an absorber, wherein the solvent comprises piperazine or a substituted piperazine in an amount of from about 4 to about 20 moles/kg of water; allowing the acidic gas to transfer from the gas mixture to the solvent; forming a purified gaseous stream and a rich solvent stream; and routing the rich solvent stream through a multistage flash stripper, wherein the multistage flash stripper is operated at temperatures less than about 175°
C.
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Specification