Process for the purification of alkylene oxide adducts

US5012013A · kind A · utility

Inventors

• Ignaz Wimmer · Winhöring, DE
• Siegfried Billenstein · Altötting, DE

Key dates

• Filing date: Apr 26, 1990
• Grant date: Apr 30, 1991
• Expiry date: Apr 26, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/30
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A novel process for the purification of an alkylene oxide adduct which has been prepared using halogen-containing metal catalysts and contains halogen-containing compounds and also metals as impurities comprises treating the alkylene oxide adduct which is to be purified with an excess of alkali metal compound and adjusting the pH of the alkaline mixture obtained to a value of at most 7 using an acid, with the proviso that the water content of the product mixture which is then present is at least 0.1% by weight, relative to the weight of the product. This product mixture is freed from water and other solvents, this resulting in the precipitation in coarse crystalline form of salts which are insoluble in the alkylene oxide adduct and which can be easily separated off to isolate the desired pure alkylene oxide adduct.