Process for removing alkaline catalysts from polyether polyols

US4482750A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hartmut Hetzel · Cologne, DE
• Pramod Gupta · Bedburg, DE
• Roland Nast
• Herbert Echterhof · Erkelenz, DE
• Ulrich Brocker · Cologne, DE

Key dates

• Filing date: Dec 22, 1982
• Grant date: Nov 13, 1984
• Expiry date: Dec 22, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2648
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for removing alkali material from a polyether polyol. From 1-20 wt. % water and 0-30 wt. % inert organic solvent are added to an alkaline polyether polyol. The resultant emulsion is maintained at a temperature of at least 70.degree. C. for a period of at least 30 minutes with little or no stirring to effect separation of the emulsion into an organic and an aqueous phase. The aqueous phase is then separated from the organic phase and the organic phase is treated by known methods to remove residual alkali material.