Patent · US Expired

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

US5258515A · kind A · utility

1Cited by

1References

7Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Klaus Hentschel · Rodenbach, DE
Marc Samson · Lokeren, BE
Marcel Vingerhoets · Brecht, BE
Karl-Ludwig Weber · Dieburg, DE

Key dates

Filing date	Aug 25, 1992
Grant date	Nov 2, 1993
Priority date	—
Expiry date	Aug 25, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D251/38
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The invention relates to aqueous solutions of sodium salts of trimercapto-s-triazine whose molar saturation concentration at 0.degree. C. to 40.degree. C. is above the saturation concentration of trimercapto-s-triazine trisodium salt (TMT-Na.sub.3). More than two but less than three hydrogen atoms of the trimercapto-s-triazine are replaced by sodium ions. The solutions preferably contain trimercapto-s-triazine disodium salt (TMT-Na.sub.2) in addition to a little TMT-Na.sub.3. Surprisingly, the water solubility of TMT-Na.sub.2 is greater than that of TMT-Na.sub.3. The solutions represent a suitable supply form for the active substance trimercapto-s-triazine (TMT-H.sub.3) used in the separation of heavy metals The preparation takes place by means of reacting TMT-Na.sub.3 with TMT-H.sub.3 in a molar ratio of 1:greater than 0-less than 0.5, especially 1:0.1 to 1:<0.5 in aqueous solution.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.