Modeling of solubility of 1,5-dinitro-naphthalen in eight organic solvents from T=(273.15 to 313.15) K and dissolution properties

Abstract The solubilities of 1,5-dinitro-naphthalen in eight organic solvents (acetonitrile, ethanol, trichloromethane, 1-propanol, acetone, toluene, ethyl acetate and ethylbenzene) were determined experimentally by using a static equilibrium method at temperatures ranging from (273.15 to 313.15) K under atmosphere pressure (101.2 kPa). They all increased non-linearly with the increase in temperature for a certain solvent. Generally, the order of the solubility of 1,5-dinitro-naphthalen from high to low in different organic solvents was: trichloromethane > toluene > (ethyl acetate, acetone) > ethylbenzene > acetonitrile > 1-propanol > ethanol. The maximum solubility was 4.508 × 10− 3 in mole fraction. As the temperature decreased from 313 K to 273 K, the maximum solubility decreased from 4.508 × 10− 3 to 1.573 × 10− 4. The measured solubility data of 1,5-dinitro-naphthalen in the studied solvents were correlated with four solubility models, which corresponded to the modified Apelblat equation, λh equation, Wilson model and NRTL model. The calculated solubilities agreed better with the experimental values by using the modified Apelblat equation than the other three models. The relative average deviations obtained via the four models were all