Process for the preparation of a crystalline L-MGDA trialkali metal salt

US9227915B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Alfred Oftring · Bad Dürkheim, DE
• Maxim Weber · Schifferstadt, DE
• Gerold Braun · Ludwigshafen, DE
• Arnulf Lauterbach · Ludwigshafen, DE

Key dates

• Filing date: May 3, 2012
• Grant date: Jan 5, 2016
• Expiry date: Jul 10, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C227/26
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process is proposed for the preparation of a crystalline L-MGDA trialkali metal salt by crystallization from an aqueous solution thereof which has been obtained by Strecker synthesis, starting from L-α-alanine, by reaction with formaldehyde and hydrocyanic acid to give L-α-alanine-N,N-diacetonitrile and subsequent alkaline saponification of the L-α-alanine-N,N-diacetonitrile to give the L-MGDA trialkali metal salt, wherein a temperature of 150° C. is not exceeded during the alkaline saponification.