This simulation uses the Peng-Robinson equation of state for mixtures to plot isotherms for n-butane(1)/n-octane(2) mixtures on a log pressure versus log volume graph. Use the sliders to select the temperature. Selecting the mole fraction x₁ of the liquid yields the isotherm for the liquid in blue. The green isotherm is for the vapor phase (mole fraction y₁) that is in equilibrium with the liquid; the values of y₁ and the pressure are determined from Raoult’s law and are displayed in the upper-right corner. The dashed black line connects the blue isotherm to the green isotherm at the VLE pressure.

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About:

This simulation was made at the University of Colorado Boulder, Department of Chemical and Biological Engineering.  Author(s): Rachael L. Baumann

View the source code for this simulation