Thermodynamic Properties of <i>cis</i>-1,1,1,4,4,4-Hexafluorobutene [R-1336mzz(Z)]: Vapor Pressure, (<i>p</i>, ρ, <i>T</i>) Behavior, and Speed of Sound Measurements and Equation of State
Mark O. McLinden, Ryo Akasaka
Abstract
= 293.15 K. Densities were measured in the liquid and supercritical regions over the temperature range of 230 to 460 K, with pressures up to 36 MPa. Vapor-phase sound speeds were measured at temperatures between 280 and 480 K, with pressures from 0.021 to 2.2 MPa. Densities and dew points were measured in a two-sinker densimeter with a magnetic suspension coupling. Vapor pressures were measured with a static technique in the densimeter. Sound speed data were measured with a spherical acoustic resonator. An equation of state written in terms of the Helmholtz energy was developed based on these data together with additional data from the literature; it represents the present experimental data with relative average absolute deviations (AAD) of 0.0081% for densities, 0.027% for vapor pressure, and 0.017% for vapor-phase speed of sound. Literature data for liquid-phase speed of sound have an AAD of 0.023%, and for saturated liquid density data, the AAD is 0.049%.