| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention refers to aqueous solution of sodium salt xNa+yH+ chelating compound of formula , where x = 2.1-2.7, y = 0.9-0.3 and x+y = 3. In addition, the invention concerns containerised aqueous solution in amount at least 0.5 kg, and to process for making aqueous solution containing at least sodium salt 45 wt % xNa+yH + chelating compound of formula (I) from Na3-HEDTA, implying electrodialysis of aqueous solution containing Na3-HEDTA 42 wt % and less with using a bipolar membrane, thereby transforming trisodium salt solution into sodium salt solution of formula (I) at x = 2.1-2.7, y = 0.9-0.3 and x+y = 3. ^ EFFECT: higher recovery. ^ 6 cl, 3 ex, 2 tbl |
