Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The solubilities of 3,5-dinitro-2-methylbenzoic acid in thirteen solvents such as 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, 2-propanol, ethyl acetate, 2-butanol, cyclohexane, toluene, ethanol, acetonitrile and water were determined through the shake-flask method from 288.15 K to 333.15 K at local pressure of p = 101.2 kPa. The mole fraction solubility values of 3,5-dinitro-2-methylbenzoic acid in the thirteen solvents rised with increasing temperature and had the sequence in the solvents: ethanol greater than ethyl acetate greater than toluene greater than 1-heptanol greater than 1-propanol greater than 1-pentanol greater than 2-butanol greater than 1-butanol greater than 2-propanol greater than 1-hexanol greater than acetonitrile greater than water greater than cyclohexane. The Wilson model, h equation, modified Apelblat equation and NRTL model were employed to correlate the experimental solubility data. The maximum root-mean-square deviation and relative average deviation values were, respectively, 930.1x10-6 and 4.37x10-2. The relative average deviations attained by using the modified Apelblat equation were lower than that by using the other equations for a certain solvent. The solvent effect upon the mole fraction solubility was studied by using the linear solvation energy relationship based on the solvent descriptors. As well, the mixing properties, the activity coefficient under infinitesimal concentration and reduced excess enthalpy were acquired through the Wilson model.