Solubility and thermodynamic analysis of 1,6-Hexanediol in (methanol + dimethyl adipate) and (n-butanol + dimethyl adipate) binary solvents from 283.15 K to 303.15 K

The solubility of 1,6-Hexanediol in (methanol   +   dimethyl adipate (DMA)), ( n -butanol   +   DMA) binary solvents was measured by the dynamic method under 0.1   MPa. The studies were carried out at different mass fractions of methanol or n -butanol from 283.15   K to 303.15   K. The solubility of 1,6-Hexanediol in binary solvents increases with increasing temperature and mass fraction of methanol or n -butanol. In a fixed temperature and fixed mass fraction of methanol or n -butanol, the solubility of 1,6-Hexanediol in (methanol   +   DMA) is greater than in ( n -butanol   +   DMA). In addition, the experimental solubility data were correlated by Jouyban–Acree model, Van't Hoff–Jouyban–Acree model, modified Apelblat–Jouyban–Acree model and Sun model, in which the Sun model shows the best agreement with the experimental solubility data. The maximum of relative average deviation ( RAD ) and the root-mean-square deviation ( RMSD ) between the experimental and calculated solubility were 5.85   ×   10 −   2 and 3.80   ×   10 −   2 , respectively. Additionally, the thermodynamic properties (including enthalpy, Gibbs energy and entropy) were also obtained, and the results show that the dissolution of 1,6-Hexanediol in the two binary solvents is an endothermic process.