发明名称 |
Process for the removal of alkali from condensation resins |
摘要 |
A process for the preparation of a condensation resin of low catalyst content from a ketone and an aldehyde comprising reacting the ketone and aldehyde in a polycondensation reaction in an aqueous medium in the presence of a basic catalyst to form the resin, which is contaminated with alkali ions from the basic catalyst, and then exposing the resin to an electrical field in a cell demarcated by ion-selective membranes permeable to the alkali ions whereby alkali ions are caused to migrate out of the resin through the membranes. Also, a process for the removal of alkali from condensation resins as described above.
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申请公布号 |
US5770677(A) |
申请公布日期 |
1998.06.23 |
申请号 |
US19970797124 |
申请日期 |
1997.02.10 |
申请人 |
HUELS AKTIENGESELLSCHAFT |
发明人 |
SRIDHAR, SRINIVASAN;DIESTER, ULRICH;ROHDE, CHRISTIAN |
分类号 |
B01D61/44;B01J47/00;B01J47/08;C08G6/02;C25B7/00;(IPC1-7):C08G2/18 |
主分类号 |
B01D61/44 |
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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