Isobaric vapor–liquid equilibria of 1,1-dimethylethoxy-butane + methanol or ethanol + water at 101.32 kPa
Introduction
The work presented in this paper continues the study on phase equilibria of alcohol and tertiary ether mixtures used as octane-enhancing components in gasoline [1], [2]. The goal of this study is to know the behaviour of these systems when increasing the molecular weight of the ether.
Herein, thermodynamically consistent [3], [4], [5], [6] vapor–liquid equilibrium (VLE) data at 101.325 kPa are presented for the systems 1,1-dimethylethoxy-butane (BTBE) + methanol + water and (BTBE) + ethanol + water and for the two constituent binary systems alcohol + ether. The Wilson [7], NRTL [8] and UNIQUAC [9] equations for the liquid phase activity coefficients are used to correlate experimental data. Group-contribution methods ASOG [10], [11], UNIFAC [3], and modified UNIFAC-Dortmund [12], [13] and UNIFAC-Lyngby [14] are applied to predict VLE data. No VLE data have been found in the open literature for the systems targeted in this work.
Section snippets
Experimental
1,1-Dimethylethoxy-butane (butyl-tert-butyl ether or BTBE) was supplied by Yarsintez (Yaroslav, Russia) with nominal purity >99.9 mass%. Methanol and ethanol were supplied by Merck (Madrid, Spain) and had a nominal purity >99.5 mass%. Water was purified using a Milli-Q Plus system. The water content of BTBE was 0.1 mass%, and for methanol and ethanol were 0.05 and 0.04 mass%, respectively, determined with a Metrohm 737 KF coulometer. Table 1 gathers information about pure components: experimental
Results and discussion
For each binary system studied, Table 2 lists experimental values for x, y, T, γ, and GERT−1. For ternary systems, isobaric VLE data were determined only for the homogeneous zones. Table 3 lists the experimental liquid- and vapor-phase compositions (xi and yi, respectively) and equilibrium temperatures (T), along with the corresponding activity coefficients (γi). Fig. 1 depicts the calculated isotherms of each ternary system. The binodal curves were taken from previous work [19].
At the
Conclusions
Experimental VLE data were determined for the binary systems methanol + BTBE and ethanol + BTBE and for the ternary systems BTBE + methanol + water and BTBE + ethanol + water at the constant pressure of 101.32 kPa. Thermodynamical consistency of the experimental VLE data reported in this work has been checked out by means of the point-to-point Fredenslund's consistency test and the Wisniak's L–W test, for the binary systems, and the Wisniak-LW and Wisniak–Tamir's modification of Mac Dermot–Ellis tests, for
Acknowledgment
The authors are grateful to the Ministerio de Ciencia y Tecnología (Spain) for financial support under project PPQ2003-01236.
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