PROCESS FOR MAKING A CRYSTALLINE ALKALI METAL SALT OF A COMPLEXING AGENT, AND CRYSTALLINE COMPLEXING AGENT

摘要

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.