Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

The liquid liquid equilibrium (LLE) data of four binary systems (o-dichlorobenzene(1) + 1,2-ethanediol (2)), (o-dichlorobenzene(1) + 1,2-propanediol(2)), (nitrobenzene(1) + 1,2-ethanediol(2)) and (nitrobenzene( 1) + 1,2-propanediol(2)) under atmospheric pressure and at temperatures 290 400 K were determined in this study. The results indicated the mutual solubility between all the binary systems increased with temperatures. The NRTL and UNIQUAC models were applied to correlate the liquid liquid equilibrium data. In addition, the data were correlated well by the UNIFAC (Do) group contribution method, in which 1,2-ethanediol was treated as a single DOH group (methodI) or two CH2OH groups (method II), and 1,2-propanediol was divided into groups ( CH3, CH2OH, CHOH). The new group interaction parameters for (ACCl DOH, ACNO2 DOH, ACCl CH2OH, ACNO2 CH2OH, ACH CH2OH) were obtained by the experimental LLE data regression. Moreover, all the new interaction parameters except the group ACNO2 DOH were proved reliable, among which the parameters for ACCl DOH were proved by estimating the binary system (chlorobenzene + 1,2-ethanediol) LLE data from literature and the parameters for (ACCl CH2OH, ACNO2 CH2OH, ACH CH2OH) were proved by estimating the LLE data of the (o-dichlorobenzene(1) + 1,2-ethanediol(2)) and (nitrobenzene(1) + 1,2-ethanediol(2)) binary systems in this work.