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Liquid-liquid equilibria for the quaternary system perfluorodecalln (PFD)/l-hepteneln-heptaneln-hexane at 288.15 K (type 111) and 298.15 K (type 11) and for the ternary systems PFDII-hepteneln-heptane, PFDII-hepteneln-hexane, and PFD/n-heptane/n-hexane at the same temperatures are reported. The experimental results are compared with values predicted by using the NRTL, the UNIQUAC, and the UNIFAC models. I ntroduction Multicomponent mixtures containing perfluorocarbons and hydrocarbons change swiftly from type to type pattern over a small temperature range. After the experimental determination of binary solubility data for some perfluorodecalin/hydrocarbon systems (1), this paper reports the results of measurements on the liquid-liquid equilibrium for quaternary and ternary systems containing perfluorodecalin, I-heptene, n-heptane, and n-hexane. Predictions of equilibrium data for these mixtures were made by using the NRTL and UNIQUAC perfluorodecalin/hydrocarbon parameters obtained from binary data. Hydrocarbon/hydrocarbon parameters were calculated by correlating the ternary data. The results are compared with the experimental ones. The same calculations were made by using the UNIFAC model. The CH,/CF,(c) and CH,CH/CF,(c) parameters were obtained from binary data (7 , 6). Experimental Section The experimental work was carried out by using a thermostated miniature cell similar to that described by Soares et al. Table I. Experimental Liquid-Liquid Equilibrium Compositions for the Ternary System PFD (l)/l-Heptene (2)/a-Heptane (3) weight fractions

Liquid-liquid equlllbrla for the quaternary system perfiuorodecalln + heptane + 1-hexene + hexane at 288.15 and 298.15 K and for the ternary systems perfluorodecalin + heptane + 1-hexene at 288.15, 298.15, and 303.15 K and perfluorodecalin + I-hexene + hexane at 288.15 and 298.15 K are reported. The experimental results are compared with values predicted from the NRTL, the UNIQUAC and the UNIFAC models.