COMPARISON OF MULTICOMPONENT GAS-CHROMATOGRAPHY MEASUREMENTS OF VAPOR-LIQUID-EQUILIBRIUM WITH STATIC MEASUREMENTS USING A POLYMER 2 SOLVENT TERNARY-SYSTEM
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Perturbation gas-liquid chromatography (GLC) was used to determine the equilibrium properties of the ternary cyclohexane/polybutadiene (PBD)/benzene system at finite concentrations for temperatures of 319.30, 333.15, and 348.15 K. Calculations using the multicomponent chromatography theory of Glover and Lau1showed an opposite temperature dependence for GLC-based solvent/solvent parameters compared with binary vapor-liquid equilibrium based solvent/solvent parameters. This confirms the trend previously reported by Ruff et al.2for the same system as in the present work. Static sorption data were also collected at 302.35, 319.30, and 333.15 K. Binary data for the benzene/PBD and cyclohexane/PBD systems were also obtained by both methods at the same temperatures. Excellent agreement was found between the two sets of binary data, reinforcing the utility of the GLC method to obtain polymer /solvent vapor-liquid equilibria. A comparison of calculated equilibria compositions using GLC-based parameters and the multicomponent chromatography of Glover and Lau1gave reasonable agreement with the ternary static sorption data at 302.35 and 319.30 K; however, due to the difficulties involved in these experiments, no definitive conclusion may be drawn from the data as to the adequacy of the multicomponent chromatography theory of Glover and Lau. 1987, American Chemical Society. All rights reserved.
