Solubility determination and correlation for 1,8-dinitronaphthalene in (acetone + methanol), (toluene + methanol) and (acetonitrile + methanol) mixed solvents

• Solubility of 1,8-dinitronaphthalene in mixed solvents were determined.
• The measured solubility data were correlated with five thermodynamic models.
• The dissolution enthalpy of 1,8-dinitronaphthalene in mixed solvents were calculated.

The solubility of 1,8-dinitronaphthalene in mixed solvents of (acetone + methanol), (toluene + methanol) and (acetonitrile + methanol) were determined experimentally by using the isothermal dissolution equilibrium method within the temperature range from (273.15 to 313.15) K under 101.3 kPa. The solubility of 1,8-dinitronaphthalene increased with increasing temperature and mass fraction of acetone or acetonitrile for the systems (acetone + methanol) and (acetonitrile + methanol). For the (toluene + methanol) system, at a certain composition of toluene, the solubility of 1,8-dinitronaphthalene increased with an increase in temperature; nevertheless at the same temperature, they increased at first and then decreased with an increase in mass fraction of toluene. At the same temperature and mass fraction of acetone, acetonitrile or toluene, the solubility of 1,8-dinitronaphthalene in acetone was greater than that in two others. The obtained solubility data were correlated by employing Jouyban–Acree model, van’t Hoff–Acree model, modified Apelblat–Acree model, Ma model and Sun model. The Jouyban–Acree model was proven to give good representation of the experimental solubility data. On the base of the measured solubility, the dissolution enthalpies of the dissolution process were calculated. Dissolution of 1,8-dinitronaphthalene in these mixed solvents is an endothermic process.

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