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

Abstract

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 nbutanol−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 npropanol−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 equilibria was investigated. Experimental data were fitted using the nonrandom two liquids model.

Computer Simulations of Deep Eutectic Solvents: Challenges, Solutions, and Perspectives

“…Most of the works are devoted to the structure and dynamical properties of DESs to understand how those relate to the composition. Another important direction is low molecular weight compounds in DESs with a main focus on the development of separation techniques for CO 2 and SO 2 removal, as well as biofuel purification [ 9 , 25 , 26 ]. In nanotechnology, DESs are applied as solvents for the development of nanoparticles [ 7 ].…”

Separation of Benzene-Cyclohexane Azeotropes Via Extractive Distillation Using Deep Eutectic Solvents as Entrainers

“…Shang et al suggested that deep eutectic solvent ChCl/Urea (1:2) could be used for extractive distillation for the separation of ethanol-water [24]. The study of Samarov [25] tested Choline chloride-based deep eutectic solvent (DES) for the separation of azeotropic mixtures of ethanol-ethyl acetate, n-propanol-n-propyl acetate and n-butanol-n-butyl acetate via liquidliquid extraction. Some researchers believed that azeotropic phenomenon was broken because hydrogen bond sites which exist in DES have strong solvation with polar substances, thus changing the relative volatility [26][27][28][29][30].…”

Ionic Conductivity and Structure of Chitosan Films Modified with Lactic Acid-Choline Chloride NADES

“…The wide application of ILs is held back by their high cost, evidences for their toxicity and lack of biodegradability [23,24]. In this sense increased attention is drawn toward alternative liquids with similar physico-chemical properties, i.e., deep eutectic solvents (DES) [25][26][27], and especially their subclass: natural deep eutectic solvents (NADES) [28]. NADES are composed of two or more natural components, which interact via strong hydrogen bonding with formation of a liquid with the melting temperature much lower than those for individual components.…”