Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Liquid-liquid phase separation of {amine e H2O e CO2} systems: New methods for key data

Coulier, Y.[Yohann], Lowe, A. R.[Alexander R.], Moreau, A.[Alejandro], Ballerat-Busserolles, K., Coxam, J.-Y.[J-Yves]
Fluid Phase Equilib. 2017, 431, 1-7
ABSTRACT
The LLE in aqueous solutions of N- methylpiperidine (NMPD, tertiary amine) and 2- methylpiperidine (2MPD, secondary amine) were investigated as function of CO2 dissolution. New experimental techniques were developed in order to determine the temperatures of phase separation in aqueous solutions loaded with controlled quantities of gas. The experimental investigation with NMPD and 2MPD solutions shows opposite effects on phase separation temperatures with CO2 dissolution. The influence of CO2 on LLE was discussed in terms of chemical reactions occurring in aqueous solutions of secondary and tertiary amines.
Compounds
# Formula Name
1 C6H13N N-methylpiperidine
2 C6H13N 2-methylpiperidine
3 CO2 carbon dioxide
4 H2O water
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
  • 3
  • 1
  • 4
  • Liquid-liquid equilibrium temperature, K ; Liquid mixture 1
  • Solvent: Mass fraction - 1; Liquid mixture 1
  • Mole fraction - 3; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • VISOBS
  • 34
  • POMD
  • 2
  • 3
  • 4
  • Liquid-liquid equilibrium temperature, K ; Liquid mixture 1
  • Solvent: Mass fraction - 2; Liquid mixture 1
  • Mole fraction - 3; Liquid mixture 1
  • Pressure, kPa; Liquid mixture 1
  • Liquid mixture 1
  • Liquid mixture 2
  • VISOBS
  • 12