Process for reducing fluoride levels in poly(tetramethylene ethe

Details Process for reducing fluoride levels in poly(tetramethylene ethe Process for reducing fluoride levels in poly(tetramethylene ethe

1989-09-14

1990-09-04

Mars, Howard T.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568621, C07L 3772, C07L 3770

Patent

active

049546589

ABSTRACT:
A process for reducing fluoride levels in PTMEG by heating aqueous PTMEG having an undesired level of fluoride (80'600 ppm) to a temperature in the range between about 200.degree. and 300.degree. C. for a period of time sufficient to reduce the fluoride content of said PTMEG. Preferably, heating is carried out with agitation to a temperature between about 225.degree. and about 275.degree. C. for about 1 minute to about 8 hours in the presence of an aqueous base, most preferably 240.degree. to 250.degree. C. in presence of aqueous lime.

REFERENCES:
patent: 2751419 (1956-06-01), Hill et al.
patent: 3925484 (1975-12-01), Baker
patent: 4115408 (1978-04-01), Baker
patent: 4371713 (1983-02-01), Matsumoto et al.

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