Publishing House SB RAS:

Publishing House SB RAS:

Address of the Publishing House SB RAS:
Morskoy pr. 2, 630090 Novosibirsk, Russia

Advanced Search

Chemistry for Sustainable Development

2021 year, number 1

Biphasic Water Systems Based on Alkylbenzyldimethylammonium Chloride and Inorganic Salting-out Agents

1Institute of Technical Chemistry, Ural Branch of the Russian Academy of Sciences, Perm, Russia
2Perm State Agrarian and Technological University, Perm, Russia
3Perm State National Research University, Perm, Russia
Keywords: phase equilibria, catamine AB, two-phase water systems
Pages: 60-67


The development of new two-phase aqueous systems based on surfactants for extraction requires the identification of patterns of delamination depending on the nature of the surfactant and salting-out agent. The phase equilibria in ternary aqueous delaminating systems containing a cationic surfactant - alkylbenzyldimethylammonium chloride (catamine AB) and an inorganic salting-out agent were studied. Catamine AB forms stratifying systems with chlorides (KCl, NaCl, NH4Cl, LiCl, CaCl2), sulphates (K2SO4, Na2SO4, (NH4)2SO4), nitrates (KNO3, NH4NO3, NaNO3, Mg(NO3)2, LiNO3, Al(NO3)3, Ca(NO3)2), as well as with Na2CO3, K2CO3, KHCO3, NaBr, KSCN, NH4F, (NH4)2HPO4 and HNO3. The influence of the nature of the salting-out agent on the process of system delamination is discussed. The best salting-out agents for catamine AB are nitrates, which have relatively low hydration energy in the series of studied anions. The phase diagram of the water - catamine AB - sodium chloride system was built up. The stratification region exists in a rather wide acidity range up to 2.4 mol/L H2SO4 (or HCl), and up to 2.8 mol/L NH3 (or 4.7 mol/L NaOH). The phases remain transparent at all studied concentrations of inorganic acids and bases. The extraction ability of the water - catamine AB - sodium chloride system was evaluated. Thallium (III) is quantitatively recovered in the range of sulphuric acid concentrations from 0.5 to 2 mol/L. The range of recoverable metals may be expanded by using organic complexing agents. Quantitative extraction of lanthanum (100 μg) is observed in the system containing 2.2 g of surfactant, 2.0 g of the salting-out agent, 1 mL of 0.01 mol/L Arsenazo III solution with a total volume of 15 mL and pH ~8.

DOI: 10.15372/CSD2021278