Separation of acids and esters in the processing of waste salt solution of cyclohexanone manufacture
Patent 4052441 Issued on October 4, 1977. Estimated Expiration Date: 
October 4, 1994. 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.
October 4, 1994. 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 2824123 2904584 3428656 3590080 InventorApplicationNo. 05/620306 filed on 10/07/1975US Classes:560/179, Oxy in acid moiety560/204, Preparing esters by esterification or carbonylation562/513, Preparation from source of undetermined composition (e.g., industrial waste, etc.)562/593Purification or recovery per seExaminersPrimary: Killos, Paul J.Attorney, Agent or FirmForeign Application Priority Data1974-10-10 OEAbstractAfter acidification and separation of a concentrated aqueous solution of sodium sulfate, the water-containing organic phase that remains is first distilled to remove mainly water, then chilled to crystallize out the bulk of the dicarboxy acids, then esterified and distilled again to obtain monocarboxy acid esters in distillate fractions, after which the residue is further esterified to facilitate obtaining the remaining dicarboxy acids in usable form. |
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