Method and system for capturing carbon dioxide and/or sulfur dioxide from gas stream

摘要

The present invention provides a system for capturing CO2 and/or SO2, comprising: (a) a CO2 and/or SO2 absorber comprising an amine and/or amino acid salt capable of absorbing the CO2 and/or SO2 to produce a CO2- and/or SO2-containing solution; (b) an amine regenerator to regenerate the amine and/or amino acid salt; and, when the system captures CO2, (c) an alkali metal carbonate regenerator comprising an ammonium catalyst capable catalyzing the aqueous alkali metal bicarbonate into the alkali metal carbonate and CO2 gas. The present invention also provides for a system for capturing SO2, comprising: (a) a SO2 absorber comprising aqueous alkali metal carbonate, wherein the alkali metal carbonate is capable of absorbing the SO2 to produce an alkali metal sulfite/sulfate precipitate and CO2.

主权项

1. A system for capturing CO2, comprising:
(a) a first chemical reaction vessel comprising an amine and/or amino acid salt, for absorbing the CO2 to produce an amine-COO compound and/or amino acid-COO compound in a CO2-containing solution; (b) a second chemical reaction vessel comprising an aqueous alkali metal carbonate for extracting the CO2 from the amine-COO compound and/or amino acid-COO compound in the CO2-containing solution to form an alkali metal bicarbonate solid and regenerate the amine and/or amino acid salt; and (c) a third chemical reaction vessel for thermally regenerating the alkali metal carbonate from the alkali metal bicarbonate.