ABSTRACT

The solubility of carbon dioxide (CO2) in three different ionic liquids {1,2,3-Tris(diethylamino) cyclopropenylium dicyanamide, [TDC] [DCN]; Ethyldimethylpropylammonium bis (trifluoro methyl sulfonyl)imide, [EMMP] [TF2N]; and 1,2,3-Tris(diethylamino)cyclopropenylium bis(trifluoro methane sulfonyl)imide, [TDC] [TF2N]} has been studied experimentally using a gravimetric microbalance. The CO2 + IL systems were studied at 313.15, 323.15 and 333.15K and over a pressure range of 100 mbar to 20000 mbar. The experimental density, Henry s law constant, entropy and the enthalpy of absorption for CO2 are also reported. The results obtained showed that CO2 solubility diminished in the following sequence: [TDC][TF2N]greater than [EMMP][TF2N] greater than[TDC][DCN]. It was found that [TDC][TF2N] shows comparable CO2 solubility to other well- known ionic liquids such as [hmim][TF2N], which makes it an attractive solvent for CO2 removal processes. The experimental solubility of CO2 in the three solvents were well correlated using the standard Peng-Robinson (PR) EoS, the Soave-Redlich-Kwong (SRK) EoS with quadratic mixing rules, and the Non-Random Two-Liquid (NRTL) model.

Compounds

#	Formula	Name
1	C17H30N6	1,2,3-tris(diethylamino)-cyclopropenylium dicyanoamide
2	C9H18F6N2O4S2	N-ethyl-N,N-dimethyl-1-propanaminium 1,1,1-trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamide
3	C17H31F6N4O4S2	1,2,3-tris(diethylamino)-cyclopropenylium bis(trifluoromethylsulfonyl)imide
4	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	Vibrating tube method	16
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	16
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	12
POMD	4 1	Mole fraction - 4 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Gravimetric Microbalance	38
POMD	4 2	Mole fraction - 4 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Gravimetric Microbalance	39
POMD	4 3	Mole fraction - 4 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Gravimetric Microbalance	39

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Experimental and thermodynamic study of CO2 solubility in promising [TF2N and DCN] ionic liquids

Zoubeik, M.[Mohamed], Henni, A.[Amr]

ABSTRACT