Aqueous solutions of sodium salts of trimercapto-s-triazine, their production and use.

摘要

The invention relates to aqueous solutions of sodium salts of trimercapto-s-triazine, whose molar saturation concentration at 0 to 40 DEG C is above the saturation concentration of the trisodium salt of trimercapto-s-triazine (TMT-Na3), where more than two, but fewer than three, H atoms of the trimercapto-s-triazine are replaced by sodium ions. The solutions preferably contain the disodium salt of trimercapto-s-triazine (TMT-Na2) besides a little TMT-Na3. Surprisingly, the solubility in water of TMT-Na2 exceeds that of TMT-Na3. The solutions are a suitable commercial form for the active substance trimercapto-s-triazine (TMT-H3), which is used in the separation of heavy metals. They are prepared by reacting TMT-Na3 with TMT-H3 in a molar ratio of 1 : greater than 0 to less than 0.5, in particular 1 : 0.1 to 1 : < 0.5, in aqueous phase.