ABSTRACT

Several hydrophilic amide-based Bronsted acidic ionic liquids (BAILs) were prepared by simple acid-base neutralization reaction of N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), and N-methylpyrrolidone (NMP) with trifluoroacetic acid (TFA) or tetrafluoroboric acid (FBA). The solubility data of CO2 in these BAILs were determined at T = (303.15, 313.15, and 323.15) K and subatmospheric pressure using isochoric saturation method. With the same cation, CO2 solubility in TFA-based BAILs was higher than that in FBA-based ones. From the variation of solubility, expressed as Henry s law constants, with temperature, the standard Gibbs free energy, enthalpy, and entropy changes of CO2 solvation were calculated. The solubilities of CO2 in these BAILs were apparently increased with increasing the molar volume of BAIL except for [DMFH][TFA].

Compounds

#	Formula	Name
1	C5H8F3NO3	N,N-dimethylformamide trifluoroacetate
2	C3H8BF4NO	N,N-dimethylformamide tetrafluoroborate
3	C7H10F3NO3	N-methylpyrrolidone trifluoroacetate
4	C5H10BF4NO	N-methylpyrrolidone tetrafluoroborate
5	C6H10F3NO3	N,N-dimethylacetamide trifluoroacetate
6	CO2	carbon dioxide

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	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	3
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	3
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	3
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	3
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	3
POMD	6 3	Mole fraction - 6 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Material balance	18
POMD	6 4	Mole fraction - 6 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Material balance	18
POMD	6 1	Mole fraction - 6 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Material balance	18
POMD	2 6	Mole fraction - 6 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Material balance	18
POMD	6 5	Mole fraction - 6 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Material balance	18

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Solubility of CO2 in amide-based Bronsted acidic ionic liquids

Deng, D.[Dongshun], Cui, Y.[Yanhong], Chen, D.[Dong], Ai, N.[Ning]

ABSTRACT