Study of Deep Eutectic Solvent on the Base Choline Chloride as Entrainer for the Separation Alcohol-Ester Systems

Choline chloride-based deep eutectic solvent (DES) was tested for the separation of azeotropic mixtures of ethanol-ethyl acetate, n-propanol-n-propyl acetate and n-butanol-n-butyl acetate via liquid-liquid extraction. The mixture of choline chloride with malonic acid with a molar ratio of 1:1 was used. Extraction experiments were conducted with the ternary mixture ethanol-ethyl acetate-DES at temperatures 293.15, 303.15, and 313.15 K and with ternary mixtures n-propanol-n-propyl acetate-DES and n-butanol n-butyl acetate DES at 293.15, 303.15, 313.15, and 323.15 K. Liquid-liquid tie-lines for studied systems were determined. The extraction performance of DES was characterized with solute distribution coefficients and values of selectively respectively to alcohol. The influence of the alkyl chain length of the alcohol and ester on the phase data were fitted using the nonrandom two liquids model. equilibria was investigated. Experimental