In this paper, we carried out bubble pressure calculation of various binary systems using the modified Peng-Robinson equation of state of Coquelet et al. (2004) and considering the temperature dependent binary interaction parameters kij(T), calculated using a group contribution method proposed by Jaubert et al. (2004) . In this work, six groups are defined: CH3, CH2, CH, C, CH4, and C2H6 that means that it is possible to estimate the kij for any mixture of n-alkanes and branched alkanes. The results demonstrate that the new model (GC-CPR) is a very good predictive model. It is shown that binary systems can be accurately predicted with the new model.

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