Continuous preparation of polytetrahydrofuran by a transesterifi

Details Continuous preparation of polytetrahydrofuran by a transesterifi Continuous preparation of polytetrahydrofuran by a transesterifi

1998-09-23

1999-11-09

Mosley, Terressa

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

525411, C08G 6300

Patent

active

059816880

ABSTRACT:
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.

REFERENCES:
Pruckmayer, Enc. of Chem. Tech., Kirk-Othmer 4th Ed., vol. 19, pp. 743-777.

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