Process for removal of carbon dioxide from a gas stream
AssigneeLafarge
InventorsEllis Gartner, Michel Gimenez, Maurice Paliard
Life of this patent
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Abstract
A process for reducing the carbon dioxide concentration of a carbon dioxide-containing gas which process includes, in a first stage, contacting the carbon dioxide-containing gas with a treating solution including an alkali metal carbonate and/or hydroxide and with a catalyst to promote the absorption of carbon dioxide to form a second solution including an alkali metal carbonate and bicarbonate and, in a second stage, contacting the second solution with a carbonatable silicate-containing material including an alkaline earth cation capable of forming an insoluble carbonate to produce silica and a solid carbonate including the cation and to regenerate a solution including alkali metal carbonate.
Claims10
A process for reducing the carbon dioxide concentration of a carbon dioxide-containing gas which process comprises, in a first stage, contacting the carbon dioxide-containing gas with a treating solution comprising an alkali metal carbonate and/or hydroxide and with a catalyst to promote the absorption of carbon dioxide to form a second solution comprising an alkali metal carbonate and bicarbonate and, in a second stage, contacting the second solution with a carbonatable silicate-containing material comprising an alkaline earth cation capable of forming an insoluble carbonate to produce silica and a solid carbonate comprising the alkaline earth cation and thus to regenerate a solution comprising alkali metal carbonate.
Dependencies are inferred from the claim text.