Patent ID: 7410627
Filing Date: 2008-08-12
Classification: C01D,E21B

Abstract:
1. A process for the recovery of anhydrous sodium carbonate from a hot aqueous solution containing sodium bicarbonate comprising: establishing a well into a mining zone; injecting hot aqueous liquid via the well into a mining zone so that the hot aqueous liquid has a temperature of at least 250° F. in the mining zone and is maintained at a sufficiently high pressure to prevent the formation of carbon dioxide and water vapor; forming in the mining zone a production solution comprising water and sodium bicarbonate; recovering the production solution from the mining zone through the well in which the hot aqueous liquid is injected; decomposing the sodium bicarbonate portion of the production solution to form a hot aqueous solution comprising sodium carbonate, wherein the hot aqueous solution is at a pressure sufficient to prevent the flashing of carbon dioxide; and recovering anhydrous sodium carbonate from the hot aqueous solution comprising sodium carbonate.