Experimental and theoretical studies of the crossover behavior of the specific heat Cv,x of ethane, propane, and their mixture at critical isochores

Abstract

The specific heat at constant volume, C~, of propane, and mixture with a concentration of.x-= 0.0081 mol fraction of propane was measured along the critical isochores at temperatures between 290 and 400 K. The measurements were performed with a high-temperature constant-volume adiabatic calorimeter. The uncertainty of most of the measurements is estimated to be less than 1.5%. Measurements have been carried out in both the one-and two-phase regions. The results for the pure components are compared with earlier measurements. Crossover equations for Cv obtained on the basis of the renormalization-group method and e-expansion are applied to represent our experimental specific heat data for ethane, propane, and its mixture along the critical isochores.

Thermodynamic Properties of Propane. III. A Reference Equation of State for Temperatures from the Melting Line to 650 K and Pressures up to 1000 MPa

“…Since the identification of propane in 1910 by Dr. Walter O. Snelling at the U.S. Bureau of Mines, many experimental studies of the thermodynamic properties of propane have been reported, e.g., p ρ T properties, saturation properties, critical parameters, heat capacities, speeds of sound, second virial coefficients, and ideal gas heat capacities (see refs − ...…”

“…There are a number of measurements for the isochoric heat capacity in the liquid phase of propane. These include the data of Perkins et al, Goodwin, Abdulagatov et al, , and Anisimov et al The data of Abdulagatov et al and Anisimov et al were measured in the critical region and at high temperatures. The equation shows substantial deviations from these data sets, and it is unclear whether this is due to deficiencies in the data or in the equation of state.…”

“…Numerous experimental studies have been carried out over the full temperature and pressure range of nearly all applications. In the thermodynamics arena, experimental data are available for density, vapor pressure, speed of sound, virial coefficients, heat capacities, enthalpies, and enthalpies of vaporization as given in refs to …”

Estimation of 2nd-order derivative thermodynamic properties using the crossover lattice equation of state

“…So, we find the last two Kernel term parameters (a 20 and a 21 ) by fitting the xLF EOS to the experimental C v -data [20][21][22] along the critical isochore. The Kernel term parameters for the xLF EOS are listed in table 1.…”

Thermodynamic properties of propane in the critical region

“…The instrument has been used to measure the isochoric heat capacity of (water + sodium hydroxide) (19) (water + potassium hydroxide), (18) (ethane + propane), (26) carbon dioxide, (20,21) water, (22) and ethane.…”