(222a) Phase Equilibrium Properties of Ternary Mixtures Containing 1-Butanol (or 2-Butanol), Cyclohexane and Methylbenzene At 313.15 K

Oxygenated additives, as ethers and alcohols have been traditionally used as a blending agent in the formulation of the new gasoline to enhance octane number in substitution of the traditional leaded products. To better understand and model the new formulated gasoline, we have started many years ago a research program on the thermodynamic characterization of ternary mixtures, as the simplest multicomponent system, containing oxygenated additives (ethers and alcohols) and different type of hydrocarbons (paraffins, cycloparaffins, aromatics, olefins).

In this work, new accurate vapor liquid equilibrium data for the two ternary systems: 1-butanol (1) + cyclohexane (2) + methylbenzene (3) or 2-butanol (1) + cyclohexane (2) + methylbenzene (3) at 313.15 K have been measured.

A static method using an isothermal total pressure cell (Van Ness’ technique) has been employed.

The investigated systems present a positive deviation from ideal behavior. Reduction of the experimental data has been done by Barker’s method using Wohl expansion, NRTL, Wilson and UNIQUAC models. Good results are obtained for the correlation by all the models.