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Experimental vapor-liquid phase compositions, phase densities, and Interfacial tensions are presented for C02 + n-tetradecane at 160 °F and pressures from 1000 psia to the critical point (interfacial tensions as low as 0.01 mN/m). These data, in combination with our previously reported results for C02 + n -butane and C02 + n-decane, provide useful Information on the effects of molecular size on the behavior of C02 + n-paraffin systems.

A study was made of the abilities of the Soave and Peng‐Robinson equations to represent the phase behavior of ethane + n‐paraffin and CO2 + n‐paraffin systems. These equations are capable of describing the phase behavior of such systems; however, the level of precision obtained varies with the degree of complexity used in representing the interaction parameters in the mixing rules employed. For ethane/C02 with n‐paraffins extending from C3 to n‐C44, an uncertainty of about 1 % is obtained for bubble point pressures (or about 0.005 mole fraction for solubilities) when two system‐specific interaction parameters per isotherm are used. Simple generalized correlations are presented for the equation‐of‐state interaction parameters which allow prediction of the bubble point pressures with an expected uncertainty of about 5.7% (0.014 in mole fraction).

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