Passive and forced synthesis of mg(oh)2 for the purpose of supplying magnesium-based capture of co2
AssigneeCarbonfree Chemicals Holdings, LLC
InventorJoe JONES
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Abstract
The present invention relates to a method for capturing carbon dioxide and sequestering the carbon dioxide as calcium carbonate. The method involves the use of an aqueous solution of magnesium hydroxide as a carbon dioxide uptake fluid. The magnesium hydroxide in the uptake fluid is produced by two distinct pathways. a forced decomposition pathway and a passive dissolution pathway. The combined use of the forced decomposition and passive dissolution pathways is a significant contributing factor to the low energy penalty of the carbon dioxide capture and sequestration method.
Claims13
A method for capturing CO2 from a gas stream and sequestering the CO2 in the form of CaCO3, the method comprising:
- (a) decomposing a MgCl2-containing material to form a first mixture comprising Mg(OH)2 and a second mixture comprising HCl and H2O;
- (b) combining CaO with a MgCl2 brine to produce a third mixture comprising Mg(OH)2 and CaCl2;
- (c) combining the first and third mixtures to provide a fourth mixture comprising Mg(OH)2 and CaCl2;
- and
- (d) contacting the fourth mixture with CO2 to produce a product mixture comprising CaCO3 and an aqueous solution of MgCl2.
Dependencies are inferred from the claim text.