Process for the production of sodium carbonate crystals
Patent 6228335 Issued on May 8, 2001. Estimated Expiration Date: 
December 10, 2017. 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.
December 10, 2017. 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 ReferencesInventorsAssigneeApplicationNo. 987978 filed on 12/10/1997US Classes:423/206.2, Alkali carbonate from trona423/421, Alkali metal containing (Li, Na, K, Rb, or Cs)423/426Densifying soda ashExaminersPrimary: Bos, StevenAttorney, Agent or FirmInternational ClassesC01D 007/00C22B 026/00 AbstractA process for the production of soda ash by withdrawing an aqueous mining solution containing dissolved sodium carbonate and at least about 1 wt % sodium bicarbonate from an underground alkali source; stripping CO2 gas from the withdrawn aqueous mining solution, to convert sodium bicarbonate dissolved therein to sodium carbonate; co-crystallizing sodium carbonate monohydrate and sodium sesquicarbonate by evaporation of water from the CO2 -stripped aqueous mining solution, without co-crystallization of anhydrous sodium carbonate, to form a slurry of crystalline solids in an aqueous liquor; recovering crystalline solids from the slurry; and calcining the recovered crystalline solids to produce soda ash. |
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