发明名称 |
PROCESS FOR THE PREPARATION OF ALKALI METAL SALTS OF 1-HYDROXY-3-OXA-1,2,4,5-PENTANE TETRACARBOXYLATE AND 3,6-DIOXA-1,2,4,5,7,8-OCTANE HEXACARBOXYLATE |
摘要 |
05-21(6804)A There is disclosed herein improved processes for the preparation of mixtures of alkali metal salts of 1-hydroxy-3-oxa-1,2,4,5-pentane tetracarboxylate and alkali metal salts of 3,6-dioxa-1,2,4,5,7,8-octane hexacarboxylate wherein D,L-tartaric acid is employed and recovered by lowering the pH of the reaction median to within the range of from about 7 to about 9.5. At the reduced pH calcium D,L-tartrate precipitates and is easily separated. The recovered tartrate may be recycled to the synthesis reaction to prepare further product. |
申请公布号 |
CA1315291(C) |
申请公布日期 |
1993.03.30 |
申请号 |
CA19890609176 |
申请日期 |
1989.08.23 |
申请人 |
MONSANTO COMPANY |
发明人 |
BOSCH, RICHARD J.;HORNG, LIOU-LIANG |
分类号 |
B01J31/04;B01J35/12;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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