ABSTRACT

In present research the binary solutions containing ionic liquid (IL), 1-ethyl-3-methylimidazolium dimethylphosphate ([EMIM] [DMP]), are considered as new working pairs for absorption heat pumps or absorption refrigerators. The IL was synthesized in the lab and mixed with water, ethanol, or methanol. Experimental (vapor + liquid) equilibrium (VLE) of these binary systems was measured at different mole fractions ranging from 0.1 to 0.5 and was correlated by the NRTL equation within the average relative deviation of 2%, which means that the (vapor + liquid) equilibrium of these binary solutions containing ionic liquid can be predicted by traditional non-electrolyte solution model. Meanwhile these binary solutions are a negative deviation from Raoult s law. Excess enthalpy of these binary systems was measured at the temperature of T = 298.15 K and at the pressure of 1 atm. The results indicate that the mixing processes of [EMIM] [DMP] with water, ethanol, or methanol are exothermal, which is a very important characteristic for working pairs used in absorption heat pumps or in absorption refrigerators.

Compounds

#	Formula	Name
1	C8H17N2O4P	1-ethyl-3-methylimidazolium dimethylphosphate
2	H2O	water
3	CH4O	methanol
4	C2H6O	ethanol

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	2 1	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Adiabatic Solution Calorimetry	5
POMD	2 1	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Adiabatic Solution Calorimetry	20
POMD	2 1	Vapor or sublimation pressure, kPa ; Gas	Temperature, K; Gas Mole fraction - 1; Liquid		Gas Liquid	Closed cell (Static) method	43
POMD	3 1	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Adiabatic Solution Calorimetry	5
POMD	3 1	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Adiabatic Solution Calorimetry	20
POMD	3 1	Vapor or sublimation pressure, kPa ; Gas	Temperature, K; Gas Mole fraction - 1; Liquid		Gas Liquid	Closed cell (Static) method	46
POMD	4 1	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Adiabatic Solution Calorimetry	5
POMD	4 1	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Adiabatic Solution Calorimetry	20
POMD	4 1	Vapor or sublimation pressure, kPa ; Gas	Temperature, K; Gas Mole fraction - 1; Liquid		Gas Liquid	Closed cell (Static) method	47

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Vapor pressures, excess enthalpies, and specific heat capacities of the binary working pairs containing the ionic liquid 1-ethyl-3-methylimidazolium dimethylphosphate

Ren, J.[Jing], Zhao, Z.[Zongchang], Zhang, X.

ABSTRACT