期刊
FLUID PHASE EQUILIBRIA
卷 448, 期 -, 页码 123-127出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fluid.2017.03.029
关键词
Liquid-liquid equilibria; Deep eutectic solvents; Choline chloride; NRTL
资金
- Russian Foundation for Basic Research [16-33-60128 mol_a_dk]
- St. Petersburg State University [12.50.1195.2014]
Two different choline chloride based deep eutectic solvents (DES) were tested for the separation of azeotropic mixture of n-hexane and ethanol via liquid-liquid extraction. The simplest mixtures of choline chloride with dibasic acids: oxalic (DES1) or malonic (DES2) with molar ratio 1:1 were used. The selected DESs were characterized by differential scanning calorimetry (DSC). Extraction experiments were conducted with pseudo-ternary mixtures n-hexane ethanol DES. Tie-lines were obtained at temperatures 293.15 K, 313.15 K and atmospheric pressure. The extraction performance of DES was characterized with solute distribution coefficients and values of selectively for ethanol. It has been shown that the most successful component for the separation of a mixture of n-hexane-ethanol is water. It was found that DES1 is more effective then DES2 for extraction of ethanol. The higher efficiency of separation of DES as compared to conventional ionic liquids (IL) makes it possible to consider them as an alternative promising solution in the separation of multicomponent mixtures. Experimental data was fitted using the nonrandom two liquids (NRTL) model. (C) 2017 Elsevier B.V. All rights reserved.
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