The molar enthalpy of vaporization, Dgl Ho m(Tav), at the average temperature, Tav = 438.15 K, for the ionic liquids (ILs), 1-alkyl-3-methylimidazolium threonine salt [Cnmim][Thr](n = 2, 4) were determined by using the isothermogravimetrical analysis. With the use of Verevkin s method, the difference of heat capacities between the gaseous phase and the liquid phase, Dgl Cp o m, for [Cnmim][Thr](n = 2, 4) were calculated based on the statistical thermodynamics. Therefore, with the use of Dgl Cp o m, the values of Dgl Ho m(Tav) were transformed into Dgl Ho m(298). According to the new scale of polarity for ILs, the order of the polarity of [Cnmim][Thr](n = 2, 4) was predicted, that is, the polarity reduces with the increasing of methylene. In addition, a new model about the enthalpy of vaporization for aprotic ILs was proposed and used to predict the vaporization enthalpy for [Cnmim][Thr](n = 3, 5, 6), but these predicted values also need to be verified in our future experiments.
Compounds
#
Formula
Name
1
C10H19N3O3
3-ethyl-1-methyl-1H-imidazolium DL-threoninate
2
C12H23N3O3
3-butyl-1-methyl-1H-imidazolium DL-threoninate
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
Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid
Temperature, K; Liquid
Liquid
Gas
Derived by Second law
1
POMD
2
Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid