Regular vapor-liquid solutions, equilibrium

Experimental vapor-liquid-equilibrium data for benzene(l)/n-heptane(2) system at 80°C (176°F) are given in Table 1.8. Calculate the vapor compositions in equilibrium with the corresponding liquid compositions, using the Scatchard-Hildebrand regular-solution model for the liquid-phase activity coefficient, and compare the calculated results with the experimentally determined composition. Ignore the nonideality in the vapor phase. Also calculate the solubility parameters for benzene and n-heptane using heat-of-vaporization data. 

Vapor-liquid equilibrium data, except in the special situations of ideal and regular solutions, must be determined experimentally. Descriptions of experimental methods [18], extensive bibliographies [67], and lists of data [7, 22] are available. 

The regular solution model approach is very similar to the UNIFAC model developed by Fredenslund et al. [23,24], where the interactions between molecules are estimated on the basis of the groups present in each molecule. Extensive tables of interaction parameters [24,25] for vapor-liquid equilibrium data prediction are weii deveioped, and the method has found applicability in the modeling of deodorizer performance [26],... 

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