Purification process
Patent 4191616 Issued on March 4, 1980. Estimated Expiration Date: 
December 14, 1998. 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 14, 1998. 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 2398485 3036126 3036127 3180878 3511757 3551300 InventorAssigneeApplicationNo. 05/969435 filed on 12/14/1978US Classes:203/44, Of distillate203/48, By crystallizing203/69, Aromatic203/91, VAPORIZATION ZONE UNDER POSITIVE PRESSURE OR VACUUM562/593Purification or recovery per seExaminersPrimary: Bascomb, Wilbur L. Jr.Attorney, Agent or FirmInternational ClassesC07C 51/44 (20060101)C07C 51/42 (20060101) Foreign Application Priority Data1977-12-19 GBAbstractAlkane dicarboxylic acids of at least 4 carbon atoms particularly the mixture of succinic, glutaric and adipic acids obtained as byproduct in the manufacture of adipic acid are purified by co-distillation with an alkylbenzene having an atmospheric pressure boiling point of 300° to 350° C. especially dodecylbenzene. |
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