Temperature and pressure dependence of the volumetric properties of binary mixtures containing polyhaloalkanes

Abstract

Densities of binary mixtures of 1,1,2-trichlorotrifluoroethane + dibromomethane, + bromochloromethane, or + bromotrichloromethane were measured over their entire composition ranges at 288.15 and 308.15 K. Thermal expansion coefficients (α) and excess molar volumes (VEm) were calculated. Moreover, densities at 298.15 K and pressures up to 80 bar (1 bar = 100 kPa) were determined for these same mixtures. Isothermal compressibilities (KT) of the pure liquids and their mixtures were obtained.Key words: density, excess volume, thermal expansion coefficient, isothermal compressibility.

Temperature and pressure dependence of the volumetric properties of binary liquid mixtures containing 1-propanol and dihaloalkanes

“…The vibratingtube temperature was measured by means of an Anton-Paar DM 100-30 digital thermometer, and was regulated to better than AE0.01 K using a GRANT LT-D6G thermostat. The thermometer was previously checked [7] against the vapor pressure of benzene (Merck, >99.9%) along with the equation of Ambrose [11] relating temperature (T 68 ) with pressure by means of a sum of Chebyshev polynomials up to degree six (as recommended by IUPAC [12]). …”

“…Following our study of the thermodynamic properties of different halogenated aliphatic compounds and their mixtures [1][2][3][4][5][6][7], we present here the densities of 1-propanol þ dibromomethane, or þbromochloromethane, or þ1,2-dichloroethane, or þ1-bromo-2-chloroethane binary mixtures at 288. 15 [8,9].…”

Temperature and Pressure Dependence of the Volumetric Properties of Binary Liquid Mixtures Containing Dihaloalkanes

“…The vibrating-tube temperature was measured using an Anton-Paar DM 100-30 digital thermometer, and was regulated to better than ±0.01 K using a Neslab RTE-210 thermostat. The thermometer was previously checked [7] against the vapor pressure of benzene using the equation of Ambrose [12] relating temperature (T 68 ) with pressure by means of a sum of Chebyshev polynomials up to degree six (as recommended by IUPAC [13]). The mixtures were prepared by weight, and the mole-fraction error was estimated to be less than ±10 −4 .…”

“…In this way, we have studied the thermodynamic properties of different halogenated aliphatic compounds and their mixtures [1][2][3][4][5][6][7]. Mono-and poly-haloalkanes represent a class of technically important compounds, used in industry as intermediates or as final products.…”

Polymorphism of CBr2Cl2

“…As far as halogenomethanes with T d molecular symmetry (CCl 4 and CBr 4 ) are concerned, a high number of experimental and molecular dynamics simulation studies have been published, while for the compounds with lower symmetry (C 3v or C 2v ) only a few experiments have been done. 18,19 The polymorphism of CBrCl 3 (C 3v molecular symmetry) has been studied by several methods such as calorimetry, 15 neutron scattering, 16 densitometry, 20 infrared and Raman spectroscopy, 21 dielectric spectroscopy 22 and the pressure-temperature phase diagram has been recently established. 14 As for CBr 2 Cl 2 the polymorphism at ordinary pressure consists of two stable forms in the solid state.…”