The present invention is directed towards a process for manufacturing a complexing agent, said process comprising the steps of (a) Providing a nitrile according to general formula (I a) or (I b) (formula I a, I b) With M being selected from alkali metal and hydrogen and combinations thereof, (b) Saponification with a total alkali amount of 2.5 to 2.9 mol of alkali metal hydroxide per mole of nitrile according to general formula (I a) or (I b), respectively, and a pH value in the range of from 9.5 to 11.5 at the end of step (b), (c) Adding an amount of alkali metal hydroxide so that the total alkali content is 2.9 to 3.1 moles per mole nitrile according to general formula(I a) or (I b), respectively, and (d) Allowing further conversion.20
本发明涉及一种用于制造络合剂的方法,该方法包括以下步骤:(a)提供符合通用式(I a)或(I b)(式I a、I b)的腈,其中M选择自碱
金属、氢和它们的组合物,(b)皂化,每摩尔通用式(I a)或(I b)的腈使用2.5至2.9摩尔的碱
金属氢氧化物总量,并在步骤(b)结束时的pH值在9.5至11.5范围内,(c)添加适量的碱
金属氢氧化物,使总碱含量为每摩尔通用式(I a)或(I b)的腈分别为2.9至3.1摩尔,(d)允许进一步转化。