AN AQUEOUS SOLUTION OF A SODIUM SALT OF HEDTA

摘要

invention is the formula of a chelate compound (chelating compound) sodium salt xNa ⁺ yH ⁺ (where x is 2.1 to 2.7, y is from 0.9 to 0.3, x + y being 3) relates to an aqueous solution comprising: ; (Formula ) ; The invention also comprises a container for the aqueous solution of more than 0.5 , and Na ₃ of sodium salt of the chelating compound of Formula from -HEDTA xNa ⁺ yH ⁺ relates to a method of producing an aqueous solution containing at least 45 wt.%, ; The method bipolar membrane (bipolar membrane) of less than 42% by weight of the Na by using ₃ by electrodialysis of an aqueous solution containing a -HEDTA, the trisodium salt solution, the sodium salt thereof (wherein in formula , x is 2.1 to 2.7, y is from 0.9 to 0.3, x + y is 3 characterized in that it comprises a solution to the conversion step of Im).