The solubility of
pentaerythritol (PE) in four binary solvents (methanol + water, ethanol
+ water, isopropanol + water, acetonitrile + water) is determined
using the gravimetric method at temperatures ranging from 283.15 to
323.15 K under 0.1 MPa. The experimental results demonstrate that
the solubility of PE increases with the increase of temperature in
all four binary solvent systems. And water has a relatively positive
effect on the solubility of PE in all four binary solvents. However,
the solubility of PE in ethanol + water and isopropanol + water mixtures
first increases with the increase of the ethanol/isopropanol fraction
and then decreases when the temperature exceeds 303.15 and 288.15
K, respectively. And the solubility reaches the maximum when the initial
mole fractions of ethanol/isopropanol of the binary solvent are 0.2.
Besides, experimental solubility is fitted with three thermodynamic
models including the modified Apelblat model, λh model, and CNIBS/R-K model, and all of the average relative deviation
(ARDs) are less than 4%, indicating good accordance with the experimental
results. In addition, among the three thermodynamic models, the CNIBS/R-K
model has the best fitting performance, in which all of the ARDs are
less than 1.7%.