Equation of state of mixtures of simple molecular fluids: the carbon disulfide + dichloromethane system

Abstract

The equation of state of CS2 + CH2C12 has been studied over the whole composition range and for 298.15 < T/K < 319.15 and 0.1 < p/MPa < 40.0. The results indicate that the system shows a higher degree of nonideality than CS2 + CC14, as well as larger pressure dependences of GE, Vs, and TSE. While the Gubbins-Gray perturbation theory leads to conclusions in agreement with the data, the Deiters equation of state gives worse results than for CS2 + CC14.

Thermodynamic properties of simple molecular fluids: tetrafluoromethane and trifluoromethane

“…Even though the value (n) =21 obtained for CF4 agrees quite well with that used in ref 3, and with the one obtained by Compostizo et al (24), the small value obtained for CHF3 is Table XIV. Thermal Expansion Coefficient ( '1 K"1) for Trifluoromethane at Various Pressures (P, har) and Temperatures (T, K)…”

“…As previously (24), the starting point Is the assumption of an effective intermolecular potential of the form U^r,T,V)…”

“…Figure 6 shows (d (Ua)/dV)T calculated from eq 4 for CF4 and for CCI4 along the saturation curve. We have used = 19 for CF4, = 22 for CCI4 (24) and m -6 in both cases. As shown by Grindley and Lind (25), eq 4 implies that (d (Ua)/dV)T should be temperature-independent along an isochore, whereas Figure 6 shows a clear temperature dependence, which indicates that eq 3 is not good enough for simple molecular fluids Ike CF4.…”

Thermophysical behavior of polar + nonpolar simple molecular mixtures: an experimental study of the acetonitrile + benzene system

“…The densitometer was calibrated with different substances of well-known densities. 6 In contrast to previous works22"24 we have found that a linear relationship between the density and the square of the period of vibration r is not suitable for obtaining the highest precision. Even though, theoretically, one might expect a r4 correction term, we have found that a r-1 term gives better results.…”

“…Even though, theoretically, one might expect a r4 correction term, we have found that a r-1 term gives better results. We have used p-p-T data reported in the literature for N2,25 CO2,26 and the substances studied in ref 6 for establishing a calibration curve for the vibrating tube. The calibration curve was tested after the experiments on each pure substance were carried out.…”