Process for electrochemical reduction of terephthalic acid
Patent 4381229 Issued on April 26, 1983. Estimated Expiration Date: 
November 9, 2001. 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.
November 9, 2001. 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 3929613 Electrochemical manufacture of pinacol Patent #: 3984294 InventorAssigneeApplicationNo. 06/319120 filed on 11/09/1981US Classes:205/443Carbonyl or hydroxy group containing other than as part of the carboxylic acid or derivativeExaminersPrimary: Niebling, John F.Attorney, Agent or FirmInternational ClassesC07C 51/347 (20060101)C07C 51/367 (20060101) C25B 3/04 (20060101) C25B 3/00 (20060101) AbstractTerephthalic acid is electrochemically reduced to p-hydroxymethylbenzoic acid in a process in an electrolysis cell in which (a) the cathode is solid and metal with an amalgam of mercury surface and has a hydrogen overvoltage which is greater than the potential for the reduction of terephthalic acid to p-hydroxymethylbenzoic acid, and, (b) sufficient mercury is added of a mercury compound to maintain the process. |
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