Process for treating carbon dioxide containing gas
First Claim
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1. A process comprising:
- a) combustion of a fossil fuel, thereby generating heat and a hot exhaust gas containing CO2;
b) converting said heat into energy;
c) cooling at least a portion of said exhaust gas to produce a cooled exhaust gas; and
d) reducing the amount of CO2 contained in the cooled exhaust gas by biologically removing said CO2;
thereby obtaining a low CO2 exhaust gas, wherein step d) comprises;
contacting an aqueous liquid phase with the cooled exhaust gas to cause at least a portion of the CO2 to dissolve into the aqueous liquid phase and catalyzing the hydration of at least a portion of the dissolved CO2 and producing a solution containing hydrogen ions and bicarbonate ions; and
wherein said hydration is catalyzed by the enzyme carbonic anhydrase or an analogue thereof.
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Abstract
A process is disclosed for recycling carbon dioxide emissions from a fossil-fuel power plant into useful carbonated species The process primarily comprises the steps of: a) burning the fossil fuel, thereby generating heat and a hot exhaust gas containing CO2; and b) converting the heat into energy. The process is characterized in that it further comprises the steps of: c) cooling the exhaust gas; and d) biologically transforming the CO2 contained in the cooled exhaust gas into carbonated species, thereby obtaining a low CO2 exhaust gas and producing useful carbonated species. The low CO2 exhaust gas obtained in step d) can be released in the atmosphere without increasing the problem of greenhouse effect.
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Citations
34 Claims
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1. A process comprising:
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a) combustion of a fossil fuel, thereby generating heat and a hot exhaust gas containing CO2; b) converting said heat into energy; c) cooling at least a portion of said exhaust gas to produce a cooled exhaust gas; and d) reducing the amount of CO2 contained in the cooled exhaust gas by biologically removing said CO2;
thereby obtaining a low CO2 exhaust gas, wherein step d) comprises;contacting an aqueous liquid phase with the cooled exhaust gas to cause at least a portion of the CO2 to dissolve into the aqueous liquid phase and catalyzing the hydration of at least a portion of the dissolved CO2 and producing a solution containing hydrogen ions and bicarbonate ions; and
wherein said hydration is catalyzed by the enzyme carbonic anhydrase or an analogue thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process comprising:
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cooling at least a portion of a CO2 containing gas to produce a cooled CO2 containing gas; and reducing the amount of CO2 contained in the cooled CO2 containing gas by biologically removing the CO2;
thereby obtaining a low CO2 gas, comprising contacting an aqueous liquid phase with the cooled CO2 containing gas to cause at least a portion of the CO2 to dissolve into the aqueous liquid phase and catalyzing the hydration of at least a portion of the dissolved CO2 and producing a solution containing hydrogen ions and bicarbonate ions; and
wherein the hydration is catalyzed by the enzyme carbonic anhydrase or an analogue thereof. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A process comprising:
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pre-treating a CO2 containing gas to remove contaminants and produce a contaminant reduced gas; reducing the amount of CO2 contained in the contaminant reduced gas by biologically removing the CO2, thereby obtaining a low CO2 gas, comprising contacting an aqueous liquid phase with the contaminant reduced gas to cause at least a portion of the CO2 to dissolve into the aqueous liquid phase and catalyzing the hydration of at least a portion of the dissolved CO2 and producing a solution containing hydrogen ions and bicarbonate ions; and
wherein the hydration is catalyzed by the enzyme carbonic anhydrase or an analogue thereof. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A process comprising:
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generating a CO2 containing gas; ensuring that the CO2 containing gas is a low temperature CO2 containing gas having a temperature sufficiently low so as to maintain a desired catalytic effect of carbonic anhydrase or analog thereof; reducing the amount of CO2 contained in the low temperature CO2 containing gas by biologically removing said CO2, thereby obtaining a low CO2 gas, comprising; contacting an aqueous liquid phase with the low temperature CO2 containing gas to cause at least a portion of the CO2 to dissolve into the aqueous liquid phase and catalyzing the hydration of at least a portion of the dissolved CO2 and producing a solution containing hydrogen ions and bicarbonate ions; and
wherein said hydration is catalyzed by the carbonic anhydrase or the analogue thereof. - View Dependent Claims (33, 34)
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Specification