Sodium bicarbonate production from nahcolite
Patent 6699447 Issued on March 2, 2004. Estimated Expiration Date: 
March 31, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 31, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3451767 3482934 3506432 3653847 3779602 3780160 3855397 3870784 Electrolytic manufacture of chlorine and sodium carbonate Process for separation of nahcolite from oil shale InventorsAssigneeApplicationNo. 09/540658 filed on 03/31/2000US Classes:423/184, Forming insoluble substance in liquid423/195, Subjecting mixture to pressure, vacuum, or steam423/422Hydrogen containing (bicarbonate)ExaminersPrimary: Bos, StevenAttorney, Agent or FirmInternational ClassesC01D 7/35 (20060101)C01D 7/12 (20060101) C01D 7/00 (20060101) AbstractA method for producing sodium bicarbonate from a nahcolite deposit comprising injecting water or other aqueous solution at a temperature of at least 250° F. into the deposit, dissolving sodium bicarbonate in the hot water to form a production solution and subjecting the production solution to multiple stages of crystallization. The sodium bicarbonate crystals may be dewatered and dried to form a commercial sodium bicarbonate product.Other References
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