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US 8,119,091 B2Granted
Carbon dioxide capture
AssigneeCarbon Engineering Limited Partnership
InventorsDavid Keith, Maryam Mahmoudkhani
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Abstract
A method of carbon dioxide capture is disclosed. In a step (a) anhydrous sodium carbonate is separated from a first aqueous solution formed by reacting carbon dioxide and an aqueous solution of sodium hydroxide. In step (b) the anhydrous sodium carbonate is treated by causticization to generate carbon dioxide and sodium hydroxide. The first aqueous solution of step (a) is formed by scrubbing a gas containing carbon dioxide with an aqueous solution of sodium hydroxide.
Claims17
A method, comprising:
- separating a hydrate of sodium carbonate from a first aqueous solution formed by reacting carbon dioxide and sodium hydroxide, wherein the first aqueous solution includes sodium hydroxide and sodium carbonate;
- dissolving the hydrate of sodium carbonate in a second aqueous solution that includes sodium hydroxide and sodium carbonate, wherein the dissolving occurs in the presence of sodium penta-titanate added to the second aqueous solution;
- heating the second aqueous solution to at least a transition temperature of monohydrate sodium carbonate and anhydrous sodium carbonate precipitation to produce anhydrous sodium carbonate, wherein the transition temperature is less than the boiling point of water at standard atmospheric pressure and wherein the sodium penta-titanate hydrolyzes to form sodium tri-titanate and sodium hydroxide;
- and
- causticizing the produced anhydrous sodium carbonate to generate carbon dioxide and sodium hydroxide.
2 more elements
A method comprising:
- (a) scrubbing a gas that includes carbon dioxide with an aqueous solution of sodium hydroxide to react the carbon dioxide to form a first aqueous solution that includes sodium hydroxide and sodium carbonate;
- (b) separating anhydrous sodium carbonate from the first aqueous solution, the separating comprising:
- separating a hydrate of sodium carbonate from the first aqueous solution;
- dissolving the hydrate of sodium carbonate in a second aqueous solution that includes sodium hydroxide and sodium carbonate, wherein the dissolving occurs in the presence of sodium penta-titanate added to the second aqueous solution;
- heating the second aqueous solution to at least a transition temperature of monohydrate sodium carbonate and anhydrous sodium carbonate precipitation to produce anhydrous sodium carbonate, wherein the transition temperature is less than the boiling point of water at standard atmospheric pressure and wherein the sodium penta-titanate hydrolyzes to form sodium tri-titanate and sodium hydroxide;
- and
- (c) treating the anhydrous sodium carbonate by causticization to generate carbon dioxide and sodium hydroxide.
4 more elements
A method comprising:
- (a) scrubbing a gas that includes carbon dioxide with an aqueous solution of alkali metal hydroxide resulting in a first aqueous solution that includes alkali metal carbonate and the alkali metal hydroxide;
- (b) separating anhydrous alkali metal carbonate from the first aqueous solution, the separating comprising:
- separating a hydrate of alkali metal carbonate from the first aqueous solution;
- dissolving the hydrate of alkali metal carbonate in a second aqueous solution that includes alkali metal hydroxide and alkali metal carbonate, wherein the dissolving occurs in the presence of sodium penta-titanate added to the second aqueous solution;
- heating the second aqueous solution to at least a transition temperature of monohydrate alkali metal carbonate and anhydrous alkali metal carbonate precipitation to produce anhydrous alkali metal carbonate, wherein the transition temperature is less than the boiling point of water at standard atmospheric pressure and wherein the sodium penta-titanate hydrolyzes to form sodium tri-titanate and alkali metal hydroxide;
- and
- (c) treating the anhydrous alkali metal carbonate by causticization to generate carbon dioxide and alkali metal hydroxide.
4 more elements
A method comprising:
- (a) scrubbing a gas that includes carbon dioxide with an aqueous solution of sodium hydroxide to react the carbon dioxide to form a first aqueous solution that includes sodium hydroxide and sodium carbonate;
- (b) separating anhydrous sodium carbonate from the first aqueous solution, the separating comprising:
- separating a hydrate of sodium carbonate from the first aqueous solution;
- dissolving the hydrate of sodium carbonate in a second aqueous solution that includes sodium hydroxide and sodium carbonate, wherein the dissolving occurs in the presence of sodium penta-titanate added to the second aqueous solution;
- heating the second aqueous solution to at least a transition temperature of monohydrate sodium carbonate and anhydrous sodium carbonate precipitation to produce anhydrous sodium carbonate, wherein the transition temperature is less than the boiling point of water at standard atmospheric pressure and wherein the sodium penta-titanate hydrolyzes to form sodium tri-titanate and sodium hydroxide;
- and
- (c) treating the anhydrous sodium carbonate by causticization to generate carbon dioxide and sodium hydroxide, wherein the carbon dioxide that is formed exclusively comes from the scrubbed gas.
4 more elements
Dependencies are inferred from the claim text.