The solubility of ethyl p-aminobenzoate (EPAB) was measured in six different alcohols (methanol, ethanol, n-propanol, n-butanol, isobutyl alcohol, isoamyl alcohol) within (283.15 to 327.15) K by the last solid disappearance method. The solubility increases with increasing temperature. The decreasing order satisfies the following sequence: methanol greater than ethanol greater than n-propanol greater than n-butanol greater than isoamyl alcohol greater than isobutyl alcohol. Four models, including modified Apelblat equation, h model, NRTL model, and Wilson model, were used to correlate the experimental data of EPAB. It is found that the modified Apelblat equation, NRTL model, and Wilson model were suitable to correlate the solubility of EPAB in the selected solvents with an overall RAD less than 2%. In addition, the changes of thermodynamic properties of solution [standard molar enthalpy (disHo), standard molar entropy (disSo), and standard molar Gibbs energy (disGo)] were obtained. The results indicate that the dissolution process of EPAB in these alcohols is endothermic and an entropy-driven process.
Compounds
#
Formula
Name
1
CH4O
methanol
2
C2H6O
ethanol
3
C3H8O
propan-1-ol
4
C4H10O
butan-1-ol
5
C4H10O
2-methyl-1-propanol
6
C5H12O
3-methylbutan-1-ol
7
C9H11NO2
ethyl 4-aminobenzoate
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
7
Triple point temperature, K ; Crystal
Crystal
Liquid
Air at 1 atmosphere
DSC
1
POMD
7
Molar enthalpy of transition or fusion, kJ/mol ; Crystal