Title:
【発明の名称】連続相と分散相の交換による末端ヒドロキシル基を有するポリテトラヒドロフランの製造方法
Document Type and Number:
Japanese Patent JP2002505712
Kind Code:
A
Abstract:
The present invention relates to a process for preparing hydroxyl-containing polymers, in particular for preparing polytetrahydrofuran with terminal hydroxyl groups, from the corresponding acyloxy-containing polymers by transesterification with alcohols in the presence of an alkali metal- or alkaline earth metal-containing catalyst, which entails the appropriate acyloxy-containing polymer being introduced together with the alcohol and the catalyst into a first prereactor (I) and converted therein at least partly to the hydroxyl-containing polymer, and the reaction solution being fed into the upper zone (IIa) of a distillation column (II) into whose lower zone (IIb) alcohol in vapor phase is additionally fed. This involves a phase exchange at the coherent and the disperse phase at the transition from the prereactor to the distillation column. Preferably, in addition to the first prereactor, a further 3 prereactors are used which serve as holdup reactors.
Inventors:
Auer, Heinz
Cyprian, Jurgen
Franz, Rotal
Franzishka, Wolfgang
Ifrant, Gabriele
Veck, alexander
Weinle, Werner
Cyprian, Jurgen
Franz, Rotal
Franzishka, Wolfgang
Ifrant, Gabriele
Veck, alexander
Weinle, Werner
Application Number:
JP55242999A
Publication Date:
February 19, 2002
Filing Date:
April 15, 1999
Export Citation:
Assignee:
BASF Akchen Gezel Shaft
International Classes:
C08G65/20; C08G65/30; C08G65/32; C08G65/331; (IPC1-7): C08G65/331; C08G65/20; C08G65/30
Attorney, Agent or Firm:
Sato Eto