Abstract
The Deiters equation of state and the Redlich–Kwong equation of state were used for calculations of low-temperature vapour–liquid phase equilibria and related thermodynamic properties in binary systems containing halogenhydrocarbons. In all calculations, standard mixing rules for the Deiters equation of state as well as the modified mixing rules (including the repulsion function and density-dependent weight factors or the repulsion function and modified mean density approximation with density-dependent weight factors) were used. The calculations were done for the following systems: CF 4/CHF 3, CF 3Cl/CF 2Cl 2, CH 4/CHF 2Cl, CH 4/CF 2Cl 2, CHF 3/CFCl 3, N 2/CF 2Cl 2. The best results were achieved with the Deiters equation of state, especially with modified mixing rules. For higher pressures and lower temperatures the Redlich–Kwong equation of state is not able to predict the phase equilibria in halogenhydrocarbon systems accurately. It fails too in the case of strongly polar substances. The best parameter sets for the Redlich–Kwong equation of state and the Deiters equation of state for the systems investigated were collected.
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