Peng-Robinson equation of state was modified to represent vapor-liquid equilibria for hydrogen-containing systems. A new expression of the temperature dependent parameter for the supercritical gas hydrogen, and the binary interaction parameters were introduced to improve the description of VLE for 19 binary systems. Results show that this work is superior to the previous work. Moreover, estimations of PVT behavior, the second virial coefficients for hydrogen, and predictions of the volumetric properties of liquid mixtures and VLE for the ternary systems are in good agreement with the experimental data.
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