A Group Contribution Modified Peng-Robinson Equation of State

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#