Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Measurement of the (pressure, density, temperature) relation of two (methane + nitrogen) gas mixtures at temperatures between 240 and 400 K and pressures up to 20 MPa using an accurate single-sinker densimeter

Chamorro, C. R., Segovia, J. J., Martin, M. C., Villamanan, M. A., Estela-Uribe, J. F.[J. F.], Trusler, J. P. M.[J. P. M.]
J. Chem. Thermodyn. 2006, 38, 7, 916-922
ABSTRACT
Comprehensive (p,q,T) measurements on two gas mixtures of (0.9CH4 + 0.1N2) and (0.8CH4 + 0.2N2) have been carried out at six temperatures between 240 and 400 K and at pressures up to 20 MPa. A total of 108 (p,q,T) data for the first mixture and 134 for the second one are given. These measurements were performed using a compact single-sinker densimeter based on Archimedes' buoyancy principle. The overall uncertainty in density q is estimated to be (1.5 Ae 10-4 . q + 2.10-3 kg.m-3) (coverage factor k = 2), the uncertainty in temperature T is estimated to be 0.006 K (coverage factor k = 2), and the uncertainty in pressure p is estimated to be 1.10-4Aep (coverage factor k = 2). The equipment has been previously checked with pure nitrogen over the whole temperature and pressure working ranges and experimental results (35 values) are given and a comparison with the reference equation of state for nitrogen is presented.
Compounds
# Formula Name
1 CH4 methane
2 N2 nitrogen
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
  • 2
  • Mass density, kg/m3 ; Liquid
  • Temperature, K; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Buoyancy - hydrostatic balance with magnetic suspension - one sinker
  • 35
  • POMD
  • 1
  • 2
  • Mass density, kg/m3 ; Gas
  • Mole fraction - 1; Gas
  • Temperature, K; Gas
  • Pressure, kPa; Gas
  • Gas
  • Buoyancy - hydrostatic balance with magnetic suspension - one sinker
  • 242