公开(公告)号：US10421711B2

公开(公告)日：2019-09-24

申请号：US16061007

申请日：2016-12-07

Applicant: BASF SE

Inventor： Constanze Franzke ,  Axel Franzke ,  Armin Stamm ,  Markus Hartmann ,  Robert Baumann

IPC: C07C227/10 ,  C07C227/18 ,  C07C227/42 ,  C07C227/02 ,  C07C229/36 ,  C11D3/33

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.