Preparation of a crystalline solid from glycine-N,N-diacetic acid derivatives with sufficiently low hygroscopicity

US5981798A · kind A · utility

Assignee

• BASF SE

Inventors

• Michael Schönherr · Bischofswerda, DE
• Matthias Rauls · Ludwigshafen, DE
• Hermann Ascherl · Dirmstein, DE
• Thomas Letzelter · Ludwigshafen, DE
• Dieter Baumann · Greven, DE
• Birgit Potthoff-Karl · Weinheim, DE

Key dates

• Filing date: Nov 5, 1997
• Grant date: Nov 9, 1999
• Expiry date: Nov 5, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C227/42
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A crystalline solid which has a sufficiently low hygroscopicity for processing and use and essentially consists of glycine-N,N-diacetic acid derivatives is prepared by adjusting the water content of the starting material containing the glycine-N,N-diacetic acid derivatives to a value of from 10 to 30% by weight, based on the starting material, and subsequently bringing about crystallization.