Process for cleaning production plants for polyester polyols

US7091304B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Hartmut Nefzger · Pulheim, DE
• Gerhard Klein · Monheim, DE
• Erhard Michels · Neunburg vorm Wald, DE
• Ulrich Boddenberg · Leichlingen, DE

Key dates

• Filing date: Dec 7, 2004
• Grant date: Aug 15, 2006
• Expiry date: Dec 7, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/269
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for cleaning multi-product production plants for polyester polyols with a cleaning polyol. The cleaning polyol can be used as a raw material in the production of further polyols.