CROSS-LINKED COPOLYMERS OF 1-VINYL-1,2,4-TRIAZOLE WITH DIVINYL SULFIDE AS SORBENTS OF PRECIOUS METALS AND METHOD FOR THEIR PREPARING Russian patent published in 2008 - IPC C08F226/06 B01J20/26 

FIELD: chemistry of high-molecular compounds, chemical technology.

SUBSTANCE: invention relates to novel nitrogen- and sulfur-containing cross-linked copolymers of 1-vinyl-1,2,4-triazole with divinyl sulfide that can be used for extraction of gold, silver and platinum from acid solutions. Invention relates to a method for synthesis of cross-linked copolymer of 1-vinyl-1,2,4-triazole with divinyl sulfide for a single step and without using a solvent. Method involves the copolymerization reaction of divinyl sulfide being both as a second monomer and as a cross-linking agent. Synthesized copolymers show high chemical stability, multiple using in cycles sorption-desorption, effective chelating capacity and high values of sorption capacity with respect to ions of precious metals, possibility for extraction of precious metals from complex solution and high values of the partition coefficients that allows their using for extraction of low concentrations of precious metals. Above indicated copolymer comprising triazole cycles is synthesized by the copolymerization reaction of 1-vinyl-1,2,4-triazole and divinyl sulfide without solvent under condition of radical initiating with azobis-isobutyric acid dinitrile (2% of monomers mixture mass) at temperature 60°C for 0.25-2 h, in argon atmosphere followed by washing out copolymer with ethyl alcohol. Synthesized copolymer has the general formula given in the invention description wherein n = 35-81 mole%; m = k = 19-65 mole%.

EFFECT: improved method of synthesis.

3 cl, 5 tbl, 9 ex