PρTx Measurements for Gas-Phase Pentafluoroethane + Propane Mixtures by the Burnett Method

Abstract

In some refrigeration-based applications, hydrocarbons (HCs) are expected to be promising long-term alternative refrigerants because of their zero ozone depletion potential (ODP) and negligible global warming potential (GWP) values. But there exists a serious disadvantage that they are flammable. Despite their flammability, however, commercial demands for HCs are increasing not only in several European countries but also in southeast Asia. On the other hand, the flammability is considered a major issue in U.S.A. and Japan. To suppress the flammability, blended mixtures of HCs with nonflammable HFCs are considered. As one of such mixtures, pentafluoroethane (R-125) and propane (R-290) mixtures are dealt with in the present study. Although the thermodynamic properties of each single component have been studied rather extensively, there is no study reported on those of this binary system. Accordingly, we have measured the gas-phase P ρ Tx properties of the binary R-125 (1) + R-290 (2) system by using the Burnett isothermal−isochoric coupling method. The present measurements cover an extensive range of temperatures (305 to 380 K), pressures up to 4.5 MPa, and densities up to 2.5 mol·dm-3 for the binary systems with four different mole fractions of x 1 = 0.00, 0.29, 0.50, and 0.75, respectively. The present paper discusses the gas-phase P ρ Tx properties for the first time regarding the present binary mixtures at their selected compositions.

Vapor–liquid equilibria for the binary system of 1,1-difluoroethane (HFC-152a)+n-butane (R-600) at various temperatures

“…VLE data for binary systems of HFC-152a (1) + n-butane (2) were measured at six temperatures between (273.15 and 323.15) K using a circulation-type equilibrium apparatus. The experimental data were correlated with the PR EOS using the Wong-Sandler mixing rules and the CSD EOS.…”

“…Azeotropic mixtures have merits since their behaviors are similar to pure compounds. However, few experimental data have been reported previously in the literature [1][2][3].…”

Thermo-Economic Evaluation of Organic Rankine Cycles for Geothermal Power Generation Using Zeotropic Mixtures

“…Experimental data for density of the selected zeotropic mixtures are available for propane/isobutane. Kayukawa and Watanabe [73] examined the liquid density at constant temperature depending on pressure for three mixture compositions. Figure 5b shows the liquid density for 26.85 °C as a function of mixture composition and pressure.…”

Vapor−Liquid Equilibria for Propane (R-290) + 1,1,1,2,3,3,3-Heptafluoropropane (HFC-227ea) at Various Temperatures

“…This system shows strong positive azeotropes for the full temperature range studied here. According to the results of this work, the PR-EOS gave better correlation results than the CSD-EOS for propane (1) + HFC-227ea (2).…”

“…VLE data for binary systems of propane (1) + HFC-227ea (2) were measured at five equally spaced temperatures between (273.15 and 323.15) K using a circulation-type equilibrium apparatus. The experimental data were correlated with the PR-EOS using the Wong-Sandler mixing rules and the CSD-EOS.…”