The solubilities of trans-cinnamic acid (t-CA) in methanol, ethanol, propanol, n-butanol, isopropyl alcohol, and isobutyl alcohol were
measured by
a synthetic method at temperatures ranging from (283.15 to 333.15)
K. The modified Apelblat equation, the λh equation,
and activity coefficient models (nonrandom two-liquid, NRTL; universal
quasichemical, UNIQUAC) were used to correlate these data. It was
found that all of the models show good agreement with the experimental
data, and the modified Apelblat equation and NRTL model give better
correlation results. Furthermore, on the basis of the NRTL model and
experimental data, the thermodynamic excess functions (G
E, S
E, H
E) of t-CA + alcohols (methanol, ethanol,
propanol, n-butanol, isopropyl alcohol, and isobutyl
alcohol) system were determined.