公开(公告)号：US09802884B2

公开(公告)日：2017-10-31

申请号：US15021398

申请日：2014-09-05

Applicant: BASF SE

Inventor： Marta Reinoso Garcia ,  Markus Hartmann ,  Kati Schmidt ,  Matthias Rauls ,  Thomas Schmidt ,  Paul Klingelhoefer ,  Alfred Oftring ,  Somnath Shivaji Kadam

IPC: C11D3/33 ,  C07C227/42 ,  C07C229/24 ,  C07C227/18 ,  C07C227/36 ,  C07C229/16 ,  C07C253/00

CPC classification number: C07C229/24 ,  C07C227/18 ,  C07C227/36 ,  C07C229/16 ,  C07C253/00 ,  C11D3/33

Abstract: Mixture of L- and D-enantiomers of methyl glycine diacetic acid (MGDA) or its respective mono-, di or trialkali metal or mono-, di- or triammonium salts, said mixture containing predominantly the respective L-isomer with an enantiomeric excess (ee) in the range of from 10 to 75%.

公开(公告)号：US11208375B2

公开(公告)日：2021-12-28

申请号：US16484016

申请日：2018-02-20

Applicant: BASF SE

Inventor： Somnath Shivaji Kadam ,  Frank Jaekel ,  Feelly Ruether ,  Lothar Karrer

IPC: C11D7/32 ,  C11D7/02 ,  C07C227/42 ,  B01D9/00 ,  C07C229/16 ,  C11D3/33 ,  C11D3/39

Abstract: Process for making solid methylglycine diacetate (MGDA) alkali metal salt (a), said process comprising the steps of (A) providing a 35 to 60% by weight aqueous solution of said MGDA salt having a temperature in the range of from 50 to 90° C., (B) adding 0.01 to 2% by weight of a particulate solid with a pore volume in the range of from 0.25 to 0.75 cm3/g, determined by nitrogen adsorption in accordance with 66134:1998-02 (b), the percentage referring to the content of (a), (C) crystallizing (a), (D) removing said crystalline (a) from the mother liquor.