A modification of Wong-Sandler mixing rule for the prediction of vapor-liquid equilibria in binary asymmetric systems |
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Authors: | Iman Zanganeh Javad Sargolzaei and Behzad Khodakarami |
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Abstract: | Systems consisting of light components and heavy hydrocarbons are highly asymmetric and industrially important. Design and
control of facilities for separation and purification of such mixtures require vapor-liquid equilibrium data. Coupling of
the cubic equation of state (EOS) with excess Gibbs energy models (EOS/G
ex
models) failed to represent the vapor-liquid equilibria (VLE) of such systems accurately. The main purpose of this work is
to present a modification of Wong-Sandler mixing rule with using the composition dependent binary interaction parameter. Vaporliquid
equilibria for 30 binary systems are calculated using the SRK equation of state with proposed model and Wong-Sandler mixing
rule. Calculated pressures and mole fractions of vapor phase are compared with experimental data. The average absolute percentage
deviation indicates that error involved in the application of modified Wong-Sandler model is less than Wong-Sandler model
in most cases. |
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