3-5-1　Measurement of isobaric / isothermal vapor-liquid equilibrium for heptane with ethanol and correlation for phase equilibria and liquid density using equation of state

Abstract

Isothermal vapor-liquid equilibria (VLE) were measured for ethanol–heptane by use of a modified Rose-Williams equilibrium still combined with ebulliometer at 363.15, 393.15 and 423.15 K. The apparatus enable VLE measurements not only for isobaric 101.33 kPa, but also for isothermal conditions. The experimental data showed a similar tendency to the data of literature at 343.15 and 483.15 K, and were well correlated with improved Peng-Robinson (PRSV) equation of state. Applying Eyring theory, PRSV equation was extended to the prediction for the liquid viscosity data. The method will contribute to design for engines using fuels mixed with bioethanol.