a predictive correlation for vapor-liquid equilibrium of co2 + n-alkane ternary systems based on cubic mixing rules

The accurate description of the phase equilibria of co2 and nalkane multicomponent mixtures over a wide range of temperature, pressure, and nalkane molecular weight, requires the models that are both consistent and mathematically flexible for such highly nonideal systems. in this study, a predictive correlation was proposed for the vaporliquid equilibrium data (vle) of co2 and nalkane ternary systems, based on the pengrobinson equation of state (pr eos), coupled to cubic mixing rules (cmrs). the ternary interaction parameters (tip) correlation is developed using binary vle data and tested for co2 + nalkane+ nalkane ternary systems. for this purpose, binary vle data of co2 + nalkane and nalkane + nalkane systems for nalkane from c3 to c24, covering a total of about 70 references, used to correlate tip in the ranges of 0.5-31 mpa and 230-663 k. two temperaturedependent tip correlations, based on acentric factor ratio, have been tuned with more than 2000 data points of the co2 + nalkane and the nalkane + nalkane binary systems with aard of 3.13% and 6.71%, respectively. the generalized predictive correlation was proposed based on the proper threebody interaction contributions and successfully tested for vle data of the co2 + n-alkane + n-alkane ternary systems.