发明名称 |
PROCESS FOR THE REMOVAL OF CATALYSTS FROM POLYETHER POLYOLS |
摘要 |
The present invention relates to a process for removing a basic catalyst from a polyether polyol having a hydroxyl number of from 4 to 250 comprising adding from 0.7 to 7 percent by weight of water, based on the polyether polyol, to an alkaline reaction medium containing the polyether polyol at a temperature of from 20 to 120.degree.C; introducing 1 to 2 times the stoichiometric amount of gaseous carbon dioxide at a temperature of from 75 to 120.degree.C, thereby forming a carbonate salt; and removing the carbonate salt by filtration.
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申请公布号 |
CA2010433(C) |
申请公布日期 |
1999.08.17 |
申请号 |
CA19902010433 |
申请日期 |
1990.02.20 |
申请人 |
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发明人 |
GUPTA, PRAMOD;SANDHAGEN, HANS-JOACHIM;ROSENBAUM, HEINZ-JORG |
分类号 |
C08G65/28;C08G65/02;C08G65/30;(IPC1-7):C07C41/34;C07C43/11 |
主分类号 |
C08G65/28 |
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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