VAPOR-LIQUID-EQUILIBRIUM OF THE TERNARY NORMAL-HEPTANE ISOPROPYL-ALCOHOL ATACTIC POLYPROPYLENE MIXTURE FROM PERTURBATION GAS-CHROMATOGRAPHY
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Multicomponent equation of state polymer solution theories have been in existence for a number of years but have not been widely applied to multicomponent experimental data. This work is a demonstration of the application of two of these theories and the classical Flory-Huggins theory in the polymer-rich concentration regime as well as a demonstration of our recent extension of the chromatographic technique to multicomponent systems. With experiments at 85, 105, and 140 C, weight fractions of up to 0.05 IPA and 0.11 n-heptane were achieved. As would be expected, these random-mixing theories had some difficulty modeling this polar-nonpolar system with the exception of Florys equation of state, which, by adjusting the segment-surface ratios, fit the data to within experimental error. All theories accurately modeled the binary n-heptane/APP system. Results from the ternary mixtures are consistent with poor solvent/solvent miscibility. Optimum interaction parameters are given for the three binary pairs for each theory. 1986, American Chemical Society. All rights reserved.