The present invention is directed towards mixtures comprising (A) 90 to 99.999% by weight of racemic methyl glycine diacetic acid (MGDA) or of MGDA with predominantly the L-isomer in an enantiomeric excess of up to 9.5% or their respective mono-, di- or trialkali metal or mono-, di- or triammonium salts, and (B) in total 0.001 to 10% by weight of the diacetic acid derivative of aspartate as free acid or as mono-, di-, tri- or tetraalkali metal salt or as mono-, di-, tri- or tetraammonium salt, percentages referring to the sum from (A) and (B).
本发明针对的混合物包括(A)90-99.999%(重量)的外消旋甲基甘
氨酸二
乙酸(MG
DA)或对映异构体过量达9.5%的主要为L-异构体的MG
DA或它们各自的一碱
金属盐、二碱
金属盐或三碱
金属盐或一
铵、二
铵或三
铵盐,以及(B)总重量为0.001至10%(重量百分比)的
天冬氨酸二
乙酸衍
生物,作为
游离酸或作为一、二、三或四碱
金属盐或作为一、二、三或四
铵盐,百分比指(A)和(B)的总和。