Apparent thermodynamic models for determination of the solubility of N-acetyl-1,3-phenylenediamine in eight pure solvents and two different miscible systems at T = (278.15–323.15) K

In this paper, a gravimetric method was utilized to measure the solubility of the N-acetyl-1,3-phe-nylenediamine under atmospheric pressure in N,N-dimethylformamide, ethyl acetate, acetone, methanol, water, tetrahydrofuran, acetonitrile, isopropanol, (isopropanol + tetrahydrofuran) and (ethyl acetate + tetrahydrofuran) binary mixtures with temperatures from T = (278.15–323.15) K. The experiment values have proved that rising temperature leads to increasing the solubility of the N-acetyl-1,3-phenylenediamine in all selected solvents. Solubility data of all pure solvents were fitted using the modified Apelblat model and the Buchowski–Ksiazaczak λh model. Solubility data of (isopropanol + tetrahydrofuran) and (ethyl acetate + tetrahydrofuran) binary solvent mixtures were fitted using the tow of the combined nearly ideal binary solvent/Redlich–Kister (CNIBS/R–K) model and the Jouyban–Acree model. During the research, the computational values match the experimental results well according to the calculations founded on all selected equations, and the combined nearly ideal binary solvent/Redlich–Kister (CNIBS/R–K) model provides a superior correlation in the binary solvent systems. In addition, the apparent thermodynamic properties of the solution process, including the Gibbs energy, enthalpy, and entropy were calculated by the van't Hoff analysis.