Speed of Sound in Binary Mixtures of Pentafluoroethane and 1,1-Difluoroethane from 243.15 K to 333.15 K and Pressures up to 30 MPa

Abstract

The speed of sound in the liquid phase for binary mixtures of pentafluoroethane (CHF 2 CF 3 ) and 1,1-difluoroethane (CHF 2 CH 3 ) was measured along six isotherms from (243 to 333) K and at pressures from near the saturation line up to about 30 MPa. The measurements were carried out by a sing-around technique operated at a frequency of 2 MHz employing the fixed-path acoustic interferometer. The combined uncertainty is estimated to be within (0.2% in the high-density region. The speed of sound in the saturated liquid was estimated by an extrapolation of data obtained for the compressed liquid to the vapor pressure. The results for (1 -x)CHF 2 CF 3 + xCHF 2 CH 3 measured for mole fractions x ) 0.3806, 0.6445, and 0.8447 were correlated by the polynomial equation as functions of temperature and pressure. The variations in the speed of sound with the composition at various temperatures and pressures are discussed for the system investigated as well as for (1 -x)CHF 2 CH 3 + xCF 3 CH 2 F and (1 -x)CHF 2 CH 3 + xCF 3 CH 3 reported elsewhere.

PVT Relationships of Binary Mixtures of Indole with 2-Methylnaphthalene and Biphenyl at 333.15 K and Pressures up to 270 MPa

“…PVT relationships of liquid mixtures under pressure are essential for the correlation of transport properties, ultrasonic speeds of sound, and related thermophysical properties [1][2][3][4] and also for the design of a high-pressure crystallization process developed by Moritoki et al [5,6]. We have been trying to develop an indole recovery process from wash oil fractions of coal tar liquids by the high-pressure crystallization method [7][8][9].…”

Chapter 10. Saturated Liquid Density of Pure Liquids and of Mixtures

“…A summary of the research on the equilibrium properties of fluids is described by Poling et al 2 In our previous studies, the saturated liquid density and related properties were widely investigated for pure liquids and mixtures and the data were utilised for the estimation of other physical properties and process design like heat pumps and refrigerators. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] In this chapter, we describe the latest experimental research and trends in saturated liquid densities of pure liquids and of liquid mixtures. Furthermore, the equations of state used to estimate saturated liquid density estimations are reviewed.…”