A Simple Mixing Rule for the Deiters Equation of State: Prediction of Interaction Second Virial Coefficients and PVTx Properties of Binary Mixtures

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  • Jalili Amir Hossein
    Gas Division Department, Research Institute of Petroleum Industry (RIPI), National Iranian Oil Company (NIOC)
  • Khodagholi Mohammad Ali
    Gas Division Department, Research Institute of Petroleum Industry (RIPI), National Iranian Oil Company (NIOC)
  • Nonahal Behrouz
    Gas Division Department, Research Institute of Petroleum Industry (RIPI), National Iranian Oil Company (NIOC)

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The interaction second virial coefficients, B12, and PVTx behavior for the binary systems consisting of N2, CO2, CH4, C2H6, C3H8, and normal C4H10 are estimated by means of the Deiters equation of state (EoS). In this way a new combining rule based on the modified Lorentz–Berthelot combining rule is proposed for this EoS. The binary interaction parameters for these combining rules are calculated by fitting the expression for the interaction second virial coefficient derived from the Deiters EoS to the experimental cross virial coefficient data. The calculated B12 values from the optimized binary interaction parameters and Deiters EoS are in good agreement with experimental data. Also a van der Waals type mixing rule with the two binary interaction parameters kij and lij obtained from the experimental B12 values is presented for the Deiters equation of state, which is able to predict the volumetric properties of the above mixtures to a good degree of accuracy in the specified temperature and pressure range. Also it has been shown that the Deiters EoS has higher accuracy relative to the Peng–Robinson EoS for the prediction of the volumetric properties of the mixtures studied in this work.

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