Thermodynamics Research Center / ThermoML | International Journal of Thermophysics

Experimental Study of the Thermodynamic Properties of Diethyl Ether (DEE) at Saturation

Polikhronidi, N. G., Abdulagatov, I. M., Batyrova, R. G., Stepanov, G. V., Ustuzhanin, E. E., Wu, J. T.
Int. J. Thermophys. 2011, 32, 3, 559-595
ABSTRACT
The isochoric heat capacities (CV1CV1CV2CV2), saturation densities (S and (S)), vapor pressures (P S), thermal-pressure coefficients V=PTV , and first temperature derivatives of the vapor pressure ? S = (dP S/dT) of diethyl ether (DEE) on the liquid gas coexistence curve near the critical point have been measured with a high-temperature and high-pressure nearly constant-volume adiabatic piezo-calorimeter. The measurements of (CV1CV1CV2CV2) were made in the liquid and vapor one- and two-phase regions along the coexistence curve. The calorimeter was additionally supplied with a calibrated extensometer to accurately and simultaneously measure the PVT, C V VT, and thermal-pressure coefficient, ? V , along the saturation curve. The measurements were carried out in the temperature range from 416 K to 466.845 K (the critical temperature) for 17 liquid and vapor densities from 212.6 kg * m-3 to 534.6 kg * m-3. The quasi-static thermo- (reading of PRT, T - t plot) and baro-gram (readings of the tensotransducer, P - t plot) techniques were used to accurately measure the phase-transition parameters (P S ,? S ,T S) and ? V . The total experimental uncertainty of density (? S), pressure (P S), temperature (T S), isochoric heat capacities (CV1CV1CV2CV2), and thermal-pressure coefficient, ? V , were estimated to be 0.02 % to 0.05 %, 0.05 %, 15 mK, 2 % to 3 %, and 0.12 % to 1.5 %, respectively. The measured values of saturated caloric (CV1CV1CV2CV2) and saturated thermal (P S, ? S, T S) properties were used to calculate other derived thermodynamic properties C P , C S, W, K T , P int, ?H vap, and VTP of DEE near the critical point. The second temperature derivatives of the vapor pressure, (d2 P S/dT 2), and chemical potential, (d2 micro/dT 2), were also calculated directly from the measured one- and two-phase liquid and vapor isochoric heat capacities (CV1CV1CV2CV2) near the critical point. The derived values of (d2 P S/dT 2) from calorimetric measurements were compared with values calculated from vapor pressure equations. The measured and derived thermodynamic properties of DEE near the critical point were interpreted in terms of the complete scaling theory of critical phenomena. In particular, the effect of a Yang Yang anomaly of strength R micro on the coexistence-curve diameter behavior near the critical point was studied. Extended scaling-type equations for the measured properties P S (T), ? S (T), and (CV1CV1CV2CV2) as a function of temperature were developed.
Compounds
# Formula Name
1 C4H10O diethyl ether
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 1
  • Critical pressure, kPa ; Liquid
  • Liquid
  • Gas
  • Extrapolated vapor pressure
  • 1
  • POMD
  • 1
  • Critical temperature, K ; Liquid
  • Liquid
  • Gas
  • quasi-static thermogram technique
  • 1
  • POMD
  • 1
  • Critical density, kg/m3 ; Liquid
  • Liquid
  • Gas
  • quasi-satatic thermogram technique
  • 1
  • POMD
  • 1
  • Molar heat capacity at constant volume, J/K/mol ; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Gas
  • High-temperature High-pressure adiabatci calorimeter
  • 12
  • POMD
  • 1
  • Molar heat capacity at constant volume, J/K/mol ; Gas
  • Temperature, K; Gas
  • Gas
  • Liquid
  • High-temperature High-pressure adiabatci calorimeter
  • 5
  • POMD
  • 1
  • Vapor or sublimation pressure, kPa ; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Gas
  • ISOPVT
  • 12
  • POMD
  • 1
  • Thermal pressure coefficient, kPa/K ; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Gas
  • barogram technique
  • 12
  • POMD
  • 1
  • Thermal pressure coefficient, kPa/K ; Gas
  • Temperature, K; Gas
  • Gas
  • Liquid
  • barogram technique
  • 5
  • POMD
  • 1
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Liquid
  • Gas
  • Constant volume piezo-calorimeter
  • 12
  • POMD
  • 1
  • Mass density, kg/m3 ; Gas
  • Temperature, K; Gas
  • Gas
  • Liquid
  • constant volume piezo-calorimeter
  • 5