Patent ID: 8119091
Filing Date: 2012-02-21
Classification: B01D,C01D,Y02C,Y02P

Abstract:
1. 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.