Two-Phase Aqueous Systems Based on Polyethylene Glycol Esters of Monoethanolamides of Synthetic Fatty Acids and Inorganic Salting-Out Agents
A. E. LESNOV1, A. V. GOLOVKINA1, O. S. KUDRYASHOVA2, S. A. DENISOVA3
1Institute of Technical Chemistry, Ural Branch of the Russian Academy of Sciences, Ul. Koroleva 3, Perm 614013 (Russia)
2Natural Sciences Institute, Ul. Genkelya 4, Perm 614990 (Russia)
3Perm State University, Ul. Bukireva 15, Perm 614990 (Russia)
Keywords: водные расслаивающиеся системы, синтамид, aqueous layering systems, gel extraction by surfactants, syntamide, гель-экстракция поверхностно-активными веществами
Abstract
The processes of phase formation and metal ion distribution in the systems without organic solvent were studied. The concentration parameters of the existence of two-phase systems water - polyethylene glycol esters of monoethanolamides of synthetic fatty acids (C n H2 n + 1CONHCH2CH2O(C2H4O) m H, where m = 5-6, n = 10-16 (syntamide-5) - inorganic salting-out agent) were determined experimentally. Chlorides, fluorides, bromides, sulphates, nitrates, carbonates and acetates of alkaline, alkaline earth metals and ammonium, and some acids were used as salting-out agents. A comparison of salting-out capacity of salts and acids was carried out on the basis of the concentration boundaries of layering regions. The broadest concentration range of the existence of layering region is observed in the case of ammonium salts. The region of two-phase liquid equilibrium is conserved to water concentration 94 % in the system with ammonium sulphate and 93 % in the system with ammonium chloride. Extraction possibilities of the system water-syntamide-5-hydrochloric acid were evaluated. Quantitative extraction of thallium (III) from HCl solutions with the concentration of 2-3 mol/L was established.
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