Process for CO 2 capture using carbonates and biocatalysts with absorption of CO 2 and desorption of ion-rich solution
First Claim
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1. A process for capturing CO2 from a CO2-containing gas comprising:
- contacting the CO2-containing gas with an absorption mixture comprising water, carbonic anhydrase and a carbonate compound to enable dissolution and transformation of CO2 into bicarbonate and hydrogen ions, thereby producing a CO2-depleted gas and an ion-rich solution, the carbonate compound being selected and used in a sufficient amount in the absorption mixture such that the ion-rich solution contains bicarbonate precipitates; and
subjecting the ion-rich solution to desorption wherein the carbonate compound promotes release of the bicarbonate ions from the ion-rich solution producing a CO2 gas stream and an ion-depleted solution.
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Abstract
A formulation and process for capturing CO2 use an absorption mixture containing water, biocatalysts and a carbonate compound. The process includes contacting a CO2-containing gas with the absorption mixture to enable dissolution and transformation of CO2 into bicarbonate and hydrogen ions, thereby producing a CO2-depleted gas and an ion-rich solution, followed by subjecting the ion-rich solution to desorption. The biocatalyst improves absorption of the mixture comprising carbonate compounds and the carbonate compound promotes release of the bicarbonate ions from the ion-rich solution during desorption, producing a CO2 gas stream and an ion-depleted solution.
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20 Claims
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1. A process for capturing CO2 from a CO2-containing gas comprising:
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contacting the CO2-containing gas with an absorption mixture comprising water, carbonic anhydrase and a carbonate compound to enable dissolution and transformation of CO2 into bicarbonate and hydrogen ions, thereby producing a CO2-depleted gas and an ion-rich solution, the carbonate compound being selected and used in a sufficient amount in the absorption mixture such that the ion-rich solution contains bicarbonate precipitates; and subjecting the ion-rich solution to desorption wherein the carbonate compound promotes release of the bicarbonate ions from the ion-rich solution producing a CO2 gas stream and an ion-depleted solution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification