发明名称 |
Process for the manufacture of ether carboxylic acids. |
摘要 |
<p>There is disclosed herein improved processes for the preparation of ether carboxylates by reacting in an alkaline reaction medium the salts of maleic acid and a carboxylic or polycarboxylic acid having a reactive hydroxyl group on a non-carbonyl carbon atom in the presence of a calcium ion catalyst wherein unreacted acid salts are recovered from the reaction medium by lowering the pH of the reaction medium to a range of from about 4 to about 6. The precipitated salts are recycled to the synthesis reaction to prepare additional amounts of product.</p> |
申请公布号 |
EP0355807(A2) |
申请公布日期 |
1990.02.28 |
申请号 |
EP19890115551 |
申请日期 |
1989.08.23 |
申请人 |
MONSANTO COMPANY |
发明人 |
CRUTCHFIELD, MARVIN MACK;HORNG, LIOU-LIANG;SCHULTZ, ROBERT GEORGE |
分类号 |
B01J31/04;B01J38/62;C07B61/00;C07C51/367;C07C51/41;C07C51/487;C07C59/305 |
主分类号 |
B01J31/04 |
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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