High-purity polyalkylene glycols and preparation thereof

US7164048B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Markus Klumpe · Mannheim, DE
• Kai-Uwe Baldenius · Ludwigshafen, DE
• Claus Hackmann · Ludwigshafen, DE
• Arnulf Lauterbach · Ludwigshafen, DE
• Hans-Peter Seelmann-Eggebert · Schifferstadt, DE
• Matthias Zipplies · Hirschberg, DE

Key dates

• Filing date: Jun 2, 2004
• Grant date: Jan 16, 2007
• Expiry date: Jul 15, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2609
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.