Process for preparing an N,N-dialky-ethanolamine having high color stability

US8791302B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Frank-Friedrich Pape · Kleinniedesheim, DE
• Johann-Peter Melder · Schifferstadt, DE
• Alfred Krause · Speyer, DE
• Roland Bou Chedid · Mannheim, DE
• Martin Rudloff · Bad Dürkheim, DE

Key dates

• Filing date: Dec 16, 2011
• Grant date: Jul 29, 2014
• Expiry date: Jun 13, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C213/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing an N,N-dialkylethanolamine of the formula I having high color stabilitywhere R1 and R2 are each independently a C1- to C8-alkyl group, by reacting ethylene oxide (EO) with a corresponding dialkylamine (R1R2NH) in the presence of water, wherein the reaction is effected continuously in a reactor, the reaction temperature is in the range from 90 to 180° C. and the residence time (RT) in the reactor is in the range from 1 to 7 min, the reactor output is treated thermally at a temperature in the range from 80 to 160° C. over a period in the range from 20 to 1000 min, and then the N,N-dialkylethanolamine is removed by distillation.