Method for producing double metal cyanide (DMC) catalysts

US6835687B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Jörg Hofmann · Krefeld, DE
• Stephan Ehlers · West Chester, US
• Bernd Klinksiek · Bensberg, DE
• Thorsten Fechtel · Recklinghausen, DE
• Matthias Ruhland · Recklinghausen, DE
• Jürgen Scholz · Leverkusen, DE
• Franz Föhles · Tönisvorst, DE
• Ulrich Esser · Moutier, CH

Key dates

• Filing date: Mar 5, 2003
• Grant date: Dec 28, 2004
• Expiry date: Mar 7, 2023

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J27/26
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention provides an improved process for the preparation of double metal cyanide (DMC) catalysts for the preparation of polyether polyols by polyaddition of alkylene oxides on to starter compounds containing active hydrogen atoms, in which aqueous solutions of a metal salt and a metal cyanide salt are first reacted in the presence of an organic complexing ligand and optionally one or more further complex-forming components to form a DMC catalyst dispersion, this dispersion is then filtered, the filter cake is subsequently washed with one or more aqueous or non-aqueous solutions of the organic complexing ligand and optionally one or more further complex-forming components by a filter cake washing and the washed filter cake is finally dried, after an optional pressing out or mechanical removal of moisture.