Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Critical temperatures and pressures of caprolactam, dimethyl sulfoxide, 1,4-dimethylpiperazine, and 2,6-dimethylpiperazine

Nikitin, Eugene D., Popov, Alexander P.
Fluid Phase Equilib. 2018, 473, 32-36
ABSTRACT
The critical temperatures and pressures of caprolactam (CASRN 105-60-2), dimethyl sulfoxide (CASRN 67-68-5), 1,4-dimethylpiperazine (CASRN 106-58-1), and 2,6-dimethylpiperazine (CASRN 108-49-6) have been measured by the pulse-heating technique applicable to thermally unstable compounds. Experimental critical constants have been compared with those calculated using the group contribution methods of Wilson and Jasperson, Marrero and Gani, Hukkerikar and co-workers. The critical properties of dimethyl sulfoxide measured in this work have also been compared with the results of computer simulation by Vahid and Maginn.
Compounds
# Formula Name
1 C6H11NO 1-aza-2-cycloheptanone
2 C2H6OS dimethyl sulfoxide
3 C6H14N2 1,4-dimethylpiperazine
4 C6H14N2 2,6-dimethylpiperazine
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 temperature, K ; Liquid
  • Liquid
  • Gas
  • Resistive pulse heating
  • 1
  • POMD
  • 1
  • Critical pressure, kPa ; Liquid
  • Liquid
  • Gas
  • Resistive pulse heating
  • 1
  • POMD
  • 2
  • Critical temperature, K ; Liquid
  • Liquid
  • Gas
  • Resistive pulse heating
  • 1
  • POMD
  • 2
  • Critical pressure, kPa ; Liquid
  • Liquid
  • Gas
  • Resistive pulse heating
  • 1
  • POMD
  • 3
  • Critical temperature, K ; Liquid
  • Liquid
  • Gas
  • Resistive pulse heating
  • 1
  • POMD
  • 3
  • Critical pressure, kPa ; Liquid
  • Liquid
  • Gas
  • Resistive pulse heating
  • 1
  • POMD
  • 4
  • Critical temperature, K ; Liquid
  • Liquid
  • Gas
  • Resistive pulse heating
  • 1
  • POMD
  • 4
  • Critical pressure, kPa ; Liquid
  • Liquid
  • Gas
  • Resistive pulse heating
  • 1