Process for preparing polyether polyols

US7015364B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Georg Heinrich Grosch · Bad Dürkheim, DE
• Dirk Franke · Birkenheide, DE
• Manfred Munzinger · Dirmstein, DE
• Kathrin Harre · Dresden, DE
• Eva Baum · Schwarzheide, DE
• Michael Stosser · Schifferstadt, DE

Key dates

• Filing date: Dec 22, 2003
• Grant date: Mar 21, 2006
• Expiry date: Feb 13, 2024

Classification

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

Abstract

A process for preparing polyether polyols includes a precipitation step, a recrystallization step, and a reaction step. In the precipitation step, a multimetal cyanide compound is precipitated by reaction of a metal salt with a cyanometalate compound. In the recrystallization step, the multimetal cyanide compound precipitated above is recrystallized by adding further metal salt and/or further cyanometalate compound. The recrystallization forms a multimetal cyanide catalyst compound. In the reaction step, an initiator and one or more alkylene oxide are reacted in the presence of the multimetal cyanide catalyst compound.