Fugacity Coefficients in Gas Mixtures Containing Light Hydrocarbons and Carbon Dioxide

Vapor-Liquid Equilibria at High Pressures. Vapor-Phase Fugacity Coefficients in Nonpolar and Quantum-Gas Mixtures

“…We present here a modified mixing rule for the constant a; this modification incorporates one characteristic binary constant and we report such constants for 115 binary systems. Extension to multicomponent systems follows without further assumptions and with no ternary (or higher) somewhat similar study, restricted to paraffin-carbon dioxide where mixtures, has recently been published by Joffe and Zudkevitch (1966). Other modifications of the Redlich-Kwong equation have been reported by Wilson (1964), Estes and Tully (1967), Robinson andJacoby (1965), and Earner, Pigford, and Shreiner (1966).…”

Equations of state for the calculation of fluid‐phase equilibria

“…equation Redlich and Kwong, 1949 . It retains the original van der Waals hard-sphere term with the addition of a temperature-dependent attractive term Joffe and Zudkevitch 1966 showed that a substantial improvement in the representation of fugacity of gas mixtures could be obtained by treating interaction parameters as empirical parameters. Calculations of the critical properties of binary mixtures indicated that, for most binary mixtures, the accuracy of the predicted critical properties could be improved substantially by adjusting the value of the interaction parameter in the mixing rule for the a term.…”

Extensions of the Theorem of Corresponding States

“…Pitzer approximated Equation 21as log PB = log P^HJr) + * log P$(Tn) (22) where log PB(0) is the simple fluid (to = 0) value. At Tb = 0.7, log P,j(0> = -1.000 and log PB(1) was defined to be -1.000 so that w = "log ^|Ts_0 7 " 1-000 (23) Equation 23 is thus the definition of the third parameter for nonpolar fluids, called the acentric factor. A similar definition of a third parameter for nonpolar fluids, ac, in terms of the reduced vapor pressure has been proposed by Riedel (42).…”

“…Similar relationships are obtained for other pseudocritical rules(40). Joffe and Zudkevitch(23) compared experimental fugacity coefficients and those calculated from Equation64 and indicate that good agreement is obtained in most cases. The extension of Equation 64 to mixtures containing polar and quantum constituents is straightforward once correction terms are established for the pure component thermodynamic properties and pseudocritical constants are determined for these mixtures.…”