发明名称 |
Verfahren zur Reinigung von Acrylsäure oder Methacrylsäure durch Kristallisation und Destillation |
摘要 |
The invention relates to a method for purifying acrylic acid or methacrylic acid by crystallization and distillation, which consists of the following steps: (a) crystallization of a mixture containing the acrylic acid or methacrylic acid, resulting in formation of a product crystallizate enriched with acrylic acid or methacrylic acid and a mother liquor; (b) distillation of at least part of the mother liquor obtained under step (a) to obtain a distillation bottom which is at least partly extracted and an overhead; (c) crystallization of at least part of the overhead obtained under step (b) so as to obtain a crystallization residue which is extracted and a crystallizate; and (d) recirculation of the crystallizate obtained under step (c) into the crystallization process (a).
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申请公布号 |
DE19829477(A1) |
申请公布日期 |
2000.01.05 |
申请号 |
DE19981029477 |
申请日期 |
1998.07.01 |
申请人 |
BASF AG |
发明人 |
BASTIAENSEN, ERIK;ECK, BERND;THIEL, JOACHIM |
分类号 |
C07C51/43;C07C51/44;C07C57/07;(IPC1-7):C07C57/07 |
主分类号 |
C07C51/43 |
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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