ABSTRACT

Studies on two-phase equilibria between the water-rich phase (LW) and the gas hydrate phase (H) are important in understanding gas behavior in water at hydrate forming conditions for processes such as carbon dioxide sequestration and natural gas recovery. A new indirect method was developed in this study and applied for measurements of gas solubilities of carbon dioxide, methane, and ethane in aqueous solutions containing gas hydrates with and without sodium chloride. Effects of temperature, pressure, and salt concentrations on the solubility of these gases in the aqueous phase in equilibrium with the hydrate phase were investigated for P ) (10 to 20) MPa. Solubilities for these gases were found to increase as temperature increases. Methane and ethane were found to show a salting-out effect, whereas carbon dioxide showed a salting-in effect in hydrate forming conditions. Solubilities of methane and ethane decreased with pressure, but those of carbon dioxide showed very weak pressure dependence.

Compounds

#	Formula	Name
1	H2O	water
2	CO2	carbon dioxide
3	CH4	methane
4	C2H6	ethane
5	ClNa	sodium chloride

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 2	Mole fraction - 2 ; Liquid mixture 1	Pressure, kPa; Liquid mixture 1 Temperature, K; Liquid mixture 1		Liquid mixture 1 Liquid mixture 2	Phase equilibration	10
POMD	1 3	Mole fraction - 3 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Gas	Phase equilibration	3
POMD	1 4	Mole fraction - 4 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid		Liquid Gas	Phase equilibration	6
POMD	1 5 2	Mole fraction - 2 ; Liquid mixture 1	Pressure, kPa; Liquid mixture 1 Temperature, K; Liquid mixture 1	Solvent: Molality, mol/kg - 5; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Phase equilibration	6
POMD	1 5 3	Mole fraction - 3 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Solvent: Molality, mol/kg - 5; Liquid	Liquid Gas	Phase equilibration	8
POMD	1 5 4	Mole fraction - 4 ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Solvent: Molality, mol/kg - 5; Liquid	Liquid Gas	Phase equilibration	6

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Solubilities of Carbon Dioxide, Methane, and Ethane in Sodium Chloride Solution Containing Gas Hydrate

Kim, Y. S., Lim, B. D., Lee, J. E., Lee, C. S.

ABSTRACT