Process for manufacturing MGDA/GLDA granules, granules, and their use

US10865362B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Marta Reinoso Garcia · Dossenheim, DE
• Michael Klemens MUELLER · Ludwigshafen, DE
• Carsten SUELING · Bischofswerda, DE
• Verena Mormul · Mannheim, DE

Key dates

• Filing date: Jul 5, 2017
• Grant date: Dec 15, 2020
• Expiry date: Jul 20, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D17/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Process for manufacturing granules of salts of at least two aminopolycarboxylic acids (A), com-prising the steps of (a) providing an aqueous solution of (A1) at least one alkali metal salt of a mixture of L- and D-enantiomers of methyl glycine diacetic acid (MGDA), said mixture containing predominantly the respective L-isomer with an enantiomeric excess (ee) in the range of from 10 to 95%, (A2) at least one alkali metal salt of L- and D-enantiomers of glutamic acid diacetic acid (GLDA) or of enantiomerically pure L-GLDA, the weight ratio of (A1) and (A2) being in the range of from 1:9 to 9:1, (b) spray granulating said solution with a gas inlet temperature of at least 125° C. Additionally, the present invention relates to granules and to their use.