METHOD OF COMPLEXING IONITE PREPARING Russian patent published in 1994 - IPC

FIELD: complexing ionites. SUBSTANCE: method involves condensation of melamine with formaldehyde in aqueous solution in the presence of alkaline agent following by addition of acidic agent and hardening of condensation product. Condensation is carried out in the presence of heterocyclic amine at the molar ratio of melamine, formaldehyde and heterocyclic amine 1: (3-5): (2-4). Hardening of condensation products is carried out at 150-160 C. 3(5)-Methylpyrazole, imidazole, benzimidazole are used as heterocyclic amine. Ionites prepared are used in analytical chemistry and hydrometallurgy for platinum metals extraction. EFFECT: improved method of ionite preparing. 2 cl, 2 tbl