Abstract
Ternary (liquid + liquid) equilibria data of diethyl carbonate (DEC) + ethanol or 1-propanol + water systems were accurately determined at 303.15 K using jacketed equilibrium cell under atmospheric pressure. The reliability of experimental tie-line data were checked by using Bachman-Brown correlation giving an r-squared value of 0.9933 and 0.9996, respectively. Both systems studied in this work exhibit Treybal’s Type I ternary phase behavior. The experimental tie-line data were correlated well using the Non-Random Two Liquid (NRTL) and Universal Quasi-Chemical (UNIQUAC) activity coefficient models giving root-mean-square deviation (RMSD) of 0.95 and 1.18% for DEC + ethanol + water system.,While DEC + 1-propanol + water system gives RMSD value of 0.30 and 0.37%, respectively. The effect of carbon chain length of alcohol to the phase boundary of both systems was observed and discussed in detail.
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