Perfluoro-n-heptane

LIQUID SOLVENTS Hepione, Iso-octane, Benzene, Carbon Tetrachloride,Corbon Oisuifide, Perfluoro-n- Heptane, Acetone,Ethyl Acetate,Methanol, and Water... 

Steele, W.V., Chirico, R.D., Knipmeyer, S.E., and Nguyen, A. Vapor pressure, heat capacity, and density along the saturation line, measurements for cyclohexanol, 2-cyclohexen-l-one, 1,2-dichloropropane, 1,4-di-ferf-butyl benzene, (+)-2-ethyl-hexanoic acid, 2-(methylamino)ethanol, perfluoro-n-heptane, and sulfolane, / Chem. Eng. ilafa, 42(6) 1021-1036,1997a. 

A high-pressure reactor was charged with water (1200 g), perfluoro-n-heptane (690 g), perfluoro(ethyl vinyl ether) (22 g), perfluoro(propyl vinyl ether)(26 g), and methanol (0.1 g). After the temperature was increased to 30°C, tetrafluoroethylene (160 g) was added until a pressure of 0.85 MPa was obtained. The overall monomer ratio... 

Using the benzene data, we obtain (<5P - <5 )2 = 10.8 cal/mol or <5j, = <5I + 3.3 = 12.5 or 5.9. Note that we can not choose between these two values solely on the basis of the data here. Activity coefficient data on perfluoro-n-heptane in other fluids would be needed to fix <5p. The value 5.9 is, however, quite close to the value of 6.0 given in Table 7.6-1. 

Doing a similar calculation to the one above, but not using the perfluoro-n-heptane data yields... 

The experimental data for the partial solubility of perfluoro-n-heptane in various solvents has been plotted as a function of both mole fraction and volume ftaction in Fig. 11.2-3. It is of interest to notice that these solubility data are almost symmeuic functions of the volume fraction and nonsymmetric functions of the mole fraction. Such behavior has also been found with other thermodynamic mixture properties these observations suggest the use of volume fractions, rather than mole fractions or mass fractions, as the appropriate concentration variables for describing nonideal mixture behavior. Indeed, this is the reason that volume fractions have been used in both the regular solution model and the Wohl expansion of Eq. 94-8 for liquid mixtures. 

Figure 11.2-3 The solubility of perfiuoro-n-heptane in various solvents."-Species 1 is perfluoro-n-heptane species 2 is the solvent. [Reprinted with permission from J.H. Hildebrand, B. B. Fisher, and H. A. Benesi, J. Am. Chem. Soc., 72, 4348 (1950). Copyright by the American Chemical Society.]...

The liquids perfluoro-n-heptane and benzene are only partially miscible at temperatures below their upper consolute temperature of 113.4°C. At 100°C one liquid phase is approximately 0.48 mole fraction benzene and the other 0.94 mole fraction- benzene (see Fig. 11.2-3). The liquid molar volume of perfluoro-tj-hepfane at 25°C is 0.226 m /kmol. 

CAS 335-57-9 EINECS/ELINCS 206-392-1 Synonyms Hexadecafluoroheptane Perfluoro-n-heptane Empirical C,F,6 Formula CF3(CF2)sCF3... 

Perfluoro-n-heptane. See Perfluoroheptane Perfluoroheptanecarboxylic acid. See Perfluorooctanoic acid Perfluorohexane... 

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