Weak acidic cation exchange resins for treatment of solutions of high salt concentration

✍ Scribed by V. Civin; H. Gaál; G. Sombor

• Publisher: Elsevier Science
• Year: 1992
• Weight: 82 KB
• Volume: 17
• Category: Article
• ISSN: 0923-1137
• DOI: 10.1016/0923-1137(92)90583-n

✦ Synopsis

Styrene-divinylbenzene and ethylene-divinylbenzene copolymers of Wofatit type were applied. The addition reaction was carded out in various solvents (water, methanol, dioxane, DMF and DMSO) at ~ 60°C with the molar ratios: 1 : 1, 1 : 1.5 and 1: 2. Selectivity coefficients of 20 uni-, bi-and multivalent cations were determined.

It was stated that VDP is a very useful reagent for obtaining resins with aminophosphonic functional groups. The best results have been achieved for n = 1 which enabled us to obtain stable and very selective complex-forming ion-exchangers having mixed functional groups, i.e., semi-strong acidic cation exchange and inner-salt forming amphoteric groups.