Pressure, volume, temperature, and composition properties of liquid n-alkane mixtures at elevated pressures
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Chemical engineers and chemists have long been In search of a general equation of state, Given the equation of state and appropriate thermodynamic relationships it Is possible to accurately predict isothermal changes in heat capacity, enthalpy, entropy and fugacity, activity coefficients, latent heat of vaporization, vapor pressure, and vapor-liquid equilibrium in mixtures. To date it has not been found. One attempt to write a specific equation of state has been made for chlorodifluoromethane (36), for example, to densities up to 2.3 times the critical density. This equation of state has constants, making It Impractical for general use and at very best cumbersome to work with. A logical limitation on an equation of state would be to require that it be valid for one phase only. This requires a different equation for each of the gas, liquid, and solid phases.
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