A GENERALIZED CORRELATION FOR THE INTERACTION COEFFICIENTS OF CO2 HYDROCARBON BINARY-MIXTURES

A generalized correlation for the interaction coefficient (k(ij)) of C O2/n-alkane binary systems with a translated modified Peng-Robinson eq uation of state (t-mPR EoS) is presented. The correlation involves the CO2 reduced temperature and alkane acentric factor as independent var iables and was developed using an extended data base up to n-C-44. Thr ough the use of an ''effective'' acentric factor the correlation is ex tended to other CO2-hydrocarbon systems. The correlation is limited an d does not apply to very asymmetric systems, where the hydrocarbon con tains more than one ring. Typical errors in bubble point pressure pred ictions are below 5-6%. The proposed correlation can also be used with the PR EoS.