Abstract
Vapor-liquid equilibrium data of chloroform + ethanol and chloroform + ethanol + CaCl 2 (at saturation) were measured at a pressure of 94.0 kPa, using a modified Malanowski equilibrium still. The salt investigated in this work, i.e. CaCl 2, exhibits a slight salting-out effect on chloroform. The experimental results of the salt-free binary were compared with those predicted by ASOG, original UNIFAC, and modified UNIFAC models which predicted the bubble-point temperatures with a root-mean-square-deviation (RMSD) of: 0.40, 0.55, and 1.48 K, respectively. RMSD values of the vapor-phase composition given by these models were: 0.020, 0.019 and 0.039 mole fraction, respectively. On the other hand, the experimental data of the salt-containing system were compared with those predicted by Wilson-Tan and NRTL-Tan models for the effect of the electrolyte on the phase behavior of the system under study which has an azeotrope around x 1 = 0.93. Both models showed similar capability in predicting the bubble-point temperatures and vapor-phase compositions: temperatures were predicted by both models with an RMSD of about 0.4 K whereas the RMSD values of the vapor-phase mole fractions, predicted by these models, were 0.026 and 0.022, respectively.
Published Version
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