Process for making a crystalline alkali metal salt of a complexing agent, and crystalline complexing agent

US10421711B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Constanze Franzke · Goldkronach, DE
• Axel Franzke · Goldkronach, DE
• Armin Stamm · Mainz, DE
• Markus Hartmann · Neustadt, DE
• Robert Baumann · Mannheim, DE

Key dates

• Filing date: Dec 7, 2016
• Grant date: Sep 24, 2019
• Expiry date: Dec 7, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D3/33
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for manufacturing a crystalline alkali metal salt of the general formula (I) [R1—CH(COO)—N(CH2—COO)2]M13 (I) wherein M1 is selected from alkali metal cations, same or different, R1 is selected from C1-C4-alkyl and CH2CH2COOM1, comprising the step of (b) crystallizing said alkali metal salt from an aqueous solution containing in the range of from 5 to 30% by weight of alkali metal hydroxide, referring to said aqueous solution.