申请人:Akzo Nobel Chemicals International B.V.
公开号:US10093612B2
公开(公告)日:2018-10-09
The present invention relates to a process to prepare N,N′-di(2-hydroxybenzyl) ethylenediamine-N,N′-diacetic acid and salts thereof comprising a reaction between formaldehyde, ethylenediamine diacetic acid or a salt thereof and phenol at a pH of between 3 and 7 and a temperature below 60° C. wherein the reaction mixture contains 0.2 to 1.1 molar equivalents of alkali metalions on the molar amount of EDDA.
本发明涉及一种制备N,N′-二(2-羟基苄基)乙二胺-N,N′-二乙酸及其盐的工艺,该工艺包括甲醛、乙二胺二乙酸或其盐和苯酚在pH值为3至7和温度低于60℃的条件下进行反应,其中反应混合物含有0.2至1.1摩尔当量的碱金属离子,碱金属离子的摩尔量为乙二胺二乙酸的摩尔量。