Production of sodium bicarbonate by reversion of soda-type feed salt
Patent 4654204 Issued on March 31, 1987. Estimated Expiration Date: 
July 16, 2005. 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.
July 16, 2005. 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. 06/755406 filed on 07/16/1985US Classes:423/422, Hydrogen containing (bicarbonate)423/186, Carbonating423/189, Utilizing carbon dioxide as reactant423/206.2Alkali carbonate from tronaExaminersPrimary: Straub, Gary P.Attorney, Agent or FirmInternational ClassesC01D 7/00 (20060101)C01D 7/10 (20060101) AbstractSodium bicarbonate is produced by introducing solid sodium carbonate, sodium sesquicarbonate, and/or Wegscheider's salt into a reversion slurry, saturated with respect to bicarbonate and containing at least 10 wt. % solids, to effect rapid and complete conversion of the feed solids to crystalline sodium bicarbonate which is recovered from the slurry. Carbon dioxide is introduced into the reversion liquor to maintain its composition at a relatively constant value, preferably in a region of the Na2 CO3 --NaHCO3 --H2 O phase diagram that minimizes the equilibrium partial pressure of CO2 vapor above such liquor. |
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