High-purity polyalkylene glycols and preparation thereof

Details High-purity polyalkylene glycols and preparation thereof High-purity polyalkylene glycols and preparation thereof

2007-01-16

2007-01-16

Price, Elvis O. (Department: 1621)

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

Organic compounds

Oxygen containing

C568S866000, C568S867000, C568S869000

Reexamination Certificate

active

10857915

ABSTRACT:
A process is described for purifying polyalkylene glycols obtained by adding alkylene oxide to alkylene glycol, in which, after addition is complete, the resultant polyalkylene glycol is treated at a pH of >7 with a bleaching agent selected from the group consisting of peroxides, peracids, percarbonates, perborates, peroxodisulfates or oxygen, in each case with or without addition of a bleaching activator.The process is suitable in particular for preparing polyethylene glycol having molar weights from 196 to 203 g/mol which meets requirements of pharmacopeias.

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Chemical Abstract, RO 114124, Jan. 29, 1999.
Chemical Abstract, CN 1132194, Oct. 2, 1996.
Chemical Abstract, RO 62314, Apr. 25, 1977.
Chemical Abstract, JP 53-046907, Apr. 27, 1978.
Chemical Abstract, RD 372014, Apr. 10, 1995.

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