Purification of brines with hydrous metal oxide ion exchangers
Patent 4855059 Issued on August 8, 1989. Estimated Expiration Date: 
July 19, 2008. 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 19, 2008. 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 3382034 Removal of Mg++ and Ca++ ions from NaCl brine Chromium oxide in ion exchange resin Patent #: 4569765 InventorAssigneeApplicationNo. 07/221149 filed on 07/19/1988US Classes:210/670, Including rehabilitating or regenerating exchange material or sorbent210/679, Utilizing exchange or sorbent material associated with inert material210/687, Calcium or magnesium (e.g., hardness, water softening, etc.)423/179.5, Lithium423/181Ion exchanging or liquid-liquid extractingExaminersPrimary: Cintins, IvarsInternational ClassesC01D 3/14 (20060101)C01D 3/00 (20060101) B01J 39/00 (20060101) B01J 39/02 (20060101) AbstractA process for the substantial removal of calcium or other divalent ions from natural or industrial brines containing high levels of another ion comprising (a) adjusting the pH of the brine to an alkaline pH of 9 to 11 with an alkaline material; and (b) contacting the brine for at least 5 minutes with an ion exchanger consisting essentially of a hydrous oxide selected from hydrous oxides of zirconium, titanium, tin, molybdenum, tungsten, thorium, niobium or tantalum and mixed hydrous oxides of these aforementioned metals at a temperature between ambient and about the boiling point of the brine being treated. |
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