发明名称 |
Continuous preparation of polytetrahydrofuran by a transesterification cascade with specific destruction of foam |
摘要 |
A process for preparing hydroxyl-containing polymers and, in particular, a process for preparing polytetrahydrofuran with terminal hydroxyl groups from the corresponding acyloxy-containing polymers by transesterification with alcohols is carried out continuously in at least one stirred vessel, with the foam produced in the transesterification being fed tangentially to a cylindrical container, preferably a cyclone separator, at an adequate velocity to destroy the foam. The liquid phase which separates out is recycled through a line to the at least one stirred vessel. This continuous process is preferably carried out in a cascade of stirred vessels, in which each stirred vessel or a subunit of at least two stirred vessels can in each case be coupled to a cylindrical container, preferably in the form of a cyclone separator.
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申请公布号 |
US5981688(A) |
申请公布日期 |
1999.11.09 |
申请号 |
US19980159086 |
申请日期 |
1998.09.23 |
申请人 |
BASF AKTIENGESELLSCHAFT |
发明人 |
AUER, HEINZ;BEISER, KLAUS;CIPRIAN, JUERGEN;FRANZ, LOTHAR;FRANZISCHKA, WOLFGANG;PESSEL, ULRICH-DIETER;WEINLE, WERNER |
分类号 |
B01J19/18;C08G65/20;C08G65/30;C08G65/331;(IPC1-7):C08G63/00 |
主分类号 |
B01J19/18 |
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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