(181d) Vapor-Liquid Equilibria of Ternary Systems Containing 1-Butanol (or 2-Butanol), + 1-Hexene and + Methylbenzene At 313.15 K

Ethers and alcohols are usually added to gasolines in order to improve their combustion and reduce pollution. Phase equilibrium data of oxygenated mixtures are important for predicting the vapor-phase composition that would be in equilibrium with hydrocarbon mixtures. In addition to the well-established industrial uses of experimental data for completely miscible ( ethers or alcohols + hydrocarbons) systems, there is a general scientific interest in using such experimental data in combination with theories or mathematical models to improve our understanding of molecular interactions in non-ideal liquid systems.

The present work is part of a research program on vapor liquid-equilibria of binary and ternary mixtures containing 1-butanol or 2-butanol with several hydrocarbons.

In this work experimental isothermal P-x-y data for the ternary systems (1-butanol + 1-hexene + methylbenzene) and (2-butanol + 1-hexene + methylbenzene) at 313.15 K are reported.

A static VLE apparatus, consisting of an isothermal total pressure cell, has been employed for measuring the vapor-liquid equilibrium of ternary systems. The apparatus and measuring technique are based on that by Van Ness and co-workers.

Data reduction by Barker’s method provides correlations for GE, using the Wohl expansion; the Wilson, NRTL, and UNIQUAC models have also been applied successfully. Good results have been obtained for all. The investigated mixtures exhibit a positive deviation from ideality.