Experimental measurement and thermodynamic modelling of liquid-liquid equilibria for the separation of 1,2-dichloroethane from cyclohexane using various extractants

Abstract

Experimental liquid-liquid equilibrium (LLE) data for the cyclohexane +1.2-dichloroethane+solvent ternary systems were determined at T=313.15K and p=101.3kPa, where the extracting agents are sulfolane, dimethyl sulfoxide, 1,4-butanediol and N,N-dimethylmethanamide. According to the experimental values, solute distribution coefficient and selectivity were obtained to estimate the feasibility of the utilization of the selected solvents for extraction of 1,2-dichloroethane from cyclohexane. The reliability and consistency of the experimentally measured LLE results were then corroborated by employing the Hand and Bachman equations. In addition, the experimental tie-line compositions were successfully regressed with the universal quasi-chemical (UNIQUAC) and nonrandom two-liquid (NRTL) thermodynamic models, and the values of relevant binary energy parameters were reported as well. Further, the solvent cost analysis indicated that dimethyl sulfoxide was a desirable extractant for separation of 1,2-dichloroethane from cyclohexane.