Crystals of [S,S]-ethylenediamine-N,N′-disuccinic acid which have a bulk density of 0.45 to 1.2 g/cm3, and a process for obtaining these crystals comprising the steps of adjusting an aqueous solution of an [S,S]-ethylenediamine-N,N′-disuccinic acid metal salt to a temperature of 40 to 80° C. and a pH of 1.9 to 4.5, and cooling the solution to a temperature below 40° C. over a period of 0.2 to 10 hours while supplying a mineral acid so as to maintain the pH at 1.9 to 4.5 to precipitate [S,S]-ethylenediamine-N,N′-disuccinic acid in a high yield.
展开▼
机译:体积密度为0.45至1.2 g / cm 3 Sup>的&sqb; S,S]-乙二胺-N,N′-二丁二酸的晶体,以及获得这些晶体的方法,包括以下步骤将S,S,-乙二胺-N,N,-二琥珀酸金属盐的水溶液调节至40-80℃。溶液的pH值为1.9至4.5,然后将溶液冷却至低于40℃的温度。在0.2至10小时的时间内,同时提供无机酸以将pH维持在1.9至4.5,以高收率沉淀S,S,S,-乙二胺-N,N,-二琥珀酸。
展开▼