Process for preparing oligo ethylene glycol methyl ether borate

US11926639B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Kathrin Luise Mariethres Werth · Dressendorf, DE
• Thomas Holtmann · Speyer, DE
• Rainer Papp · Speyer, DE
• Mirko Haider · Ludwigshafen am Rhein, DE
• Joachim Wulff-Doering · Bischofswerda, DE

Key dates

• Filing date: Nov 19, 2020
• Grant date: Mar 12, 2024
• Expiry date: Mar 5, 2041

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing oligo ethylene glycol methyl ether borate involves feeding boric acid and oligo ethylene glycol monomethyl ether into a reactor, and reacting to obtain a raw product containing oligo ethylene glycol methyl ether borate, water, and unreacted boric acid and oligo ethylene glycol monomethyl ether. The raw product is fed to a reactive distillation device and boric acid is reacted with oligo ethylene glycmonomethyl ether for full conversion of boric acid. A distillate stream containing water is transferred from the top of the reactive distillation device to a condenser, and a condensed liquid stream is recycled to the top of the reactive distillation device. A bottom product stream containing oligo ethylene glycol methyl ether borate is withdrawn from the reactive distillation device. The bottom product stream is partially recycled to a reboiler. The resulting vapor stream is recycled to the bottom of the reactive distillation device.