发明名称 |
PROCESS FOR THE PRODUCTION OF HYDROXYARYLGLYOXYLIC ACIDS AND OF THE ALCALINE SALTS THEREOF,AND ITS APPLICATION TO THE PRODUCTION OF SODIUM PARA-HYDROXYPHENYLGLYOXYLATE |
摘要 |
Process for producing hydroxyarylglycoxylic acids from hydroxyarylglycolic acids by catalytic oxidation in an alkaline aqueous medium, at a pH higher or equal to 11.5 by oxygen or by oxygen-containing gas, characterized in that it is carried out in homogeneous phase at a temperature lower or equal to 30`C and in the presence of cupric ions and in that at the end of the reaction the acid looked for is isolated from the reaction medium by acidification at a pH of about 0.5. The sodium para-hydroxyphenilglyoxylate is obtained at the end of the reaction when the acidification is stopped at a pH of 5. |
申请公布号 |
WO8200821(A1) |
申请公布日期 |
1982.03.18 |
申请号 |
WO1981FR00108 |
申请日期 |
1981.08.27 |
申请人 |
SOC HOECHST FRANCAISE;SCHOUTEETEN A;CHRISTIDIS Y;VALLEJOS J |
发明人 |
SCHOUTEETEN A;CHRISTIDIS Y;VALLEJOS J |
分类号 |
C07C59/90;B01J27/00;B01J31/04;C07C45/39;C07C47/575;C07C51/00;C07C51/235;C07C51/373;C07C51/41;C07C51/487;C07C67/00;(IPC1-7):07C59/90;07C51/41;07C51/373;07C51/487 |
主分类号 |
C07C59/90 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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