Process for recovery of organic acids from aqueous solutions
Patent 4705894 Issued on November 10, 1987. Estimated Expiration Date: 
March 21, 2006. 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 21, 2006. 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 3816524 Process for the synthesis of tertiary phosphine oxides, and new tertiary phosphine oxides Patent #: 4365094 InventorsApplicationNo. 06/842489 filed on 03/21/1986US Classes:562/580, Purification or recovery per se562/582, Polycarboxylic562/584, Citric acid per se or salt thereof562/585, Tartaric acid per se or salt thereof562/593, Purification or recovery per se562/597, Oxalic acid per se or salt thereof987/121Pentavalent P compound having the structure (C)-P(=X)(C or H)(C or H) where X is chalcogen (9/53)ExaminersPrimary: Killos, Paul J.Assistant: Gray, Bruce Attorney, Agent or FirmInternational ClassesC07C 51/42 (20060101)C07C 51/48 (20060101) C07F 9/00 (20060101) C07F 9/53 (20060101) AbstractA mixture of trialkyl phosphine oxides (HTRPO) was prepared having the formula: ##STR1## wherein R1, R2 and R3 are same or different alkyl groups of 5 to 9 carbon atoms and the total number of carbon atoms and the total number of carbon atoms per molecule is from 15 to 27. The mixture of trialkyl phosphine oxides (HTRPO) is useful as an extractant for recovering acids from aqueous solutions. |
| ||||||||||||||
