Representación simultánea del Equilibrio Líquido-Vapor, el volumen molar y la entalpía de exceso de mezclas complejas mediante una ecuación de estado tipo Peng-Robinson

A generalized Peng -Robinson equation of state with the Huron-Vidal mixing rules is selected to correlate vapor-liquid equilibrium, molar volume and excess enthalpy of polar and non-polar mixtures. The concept of homologous series is used to develop generalized expressions that can be used to describe the thermodynamic properties of a binary mixture from parameters of the pure substances. The homologous series analyzed are: ethanol+n-alkanes, butanol+n-alkanes, 2-methoxy-2-methylbutane+n-alkanes, dimethyl carbonate+n-alkanes, 2-methoxy-2-methylbutane+n-alcohols and dimethyl carbonate+n-alcohols. Generalized expressions to obtain the binary interaction parameters of a mixture were developed as a function of the ratio between the critical temperature and the critical pressure of the compounds in the homologous series. In general, results are acceptable and show the ability of the thermodynamic model to represent the three properties simultaneously.