Alkoxylation catalyst

US6365541B1 · kind B1 · utility

Assignee

• Clariant Corporation · DE

Inventors

• Ignaz Wimmer · Winhöring, DE
• Hildegard Freundl · Altötting, DE

Key dates

• Filing date: Feb 25, 1999
• Grant date: Apr 2, 2002
• Expiry date: Feb 25, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2231/4288
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

An alkoxylation catalyst is prepared bya) reaction of one mol of a dicarboxylic acid with from 1.5 to 8 mol of an alkoxylated alcohol to form the corresponding dicarboxylic monoester,b) formation of an alkaline earth metal salt of the dicarboxylic monoester by addition of water and from 0.45 to 0.55 mol of a basic alkaline earth metal compound per mol of dicarboxylic acid originally used,c) partial neutralization of the alkaline earth metal salt by addition of from 0.25 to 0.7 mol of H2SO4 per mol of basic alkaline earth metal compound originally used andd) removal of the water present at a temperature of less than 100° C.The catalyst prepared in this way makes it possible to prepare colorless alkoxylates having a narrow homologue distribution.