Method for obtaining oligomers of polytetrahydofurane or tetrahydrofurane

US7718041B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Volkmar Menger · Neustadt, DE
• Michael Schwarztrauber · Neustadt, DE
• Martin Haubner · Ludwigshafen am Rhein, DE
• Klaus-Peter Pfaff · Friedelsheim, DE

Key dates

• Filing date: Jun 19, 2004
• Grant date: May 18, 2010
• Expiry date: Apr 5, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S203/24
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for obtaining oligomers of polytetrahydrofuran or of tetrahydrofuran copolymers from a methanolic crude product which contains polytetrahydrofuran or tetrahydrofuran copolymers and is obtained in the transesterification of the mono- and/or diesters of polytetrahydrofuran or tetrahydrofuran copolymers with methanol, which includes a) removing the majority of the methanol from the crude product in a first distillation stage, b) separating the resulting bottom product by distillation into a top fraction containing the oligomers of polytetrahydrofuran or of tetrahydrofuran copolymers, and polytetrahydrofuran or tetrahydrofuran copolymer, and c) condensing the oligomers of polytetrahydrofuran or of tetrahydrofuran copolymers out of the top fraction from stage b).