Solubility Modeling and Mixing Properties for Benzoin in Different Monosolvents and Solvent Mixtures at the Temperature Range from 273.15 to 313.15 K

In the present work, the benzoin solubility in ethanol, methanol, n-propanol, isopropyl alcohol, n-butanol, acetone, ethyl acetate, acetonitrile, cyclohexane, butyl acetate, isobutyl alcohol, and toluene and ethyl acetate + ethanol solvent mixtures was measured by using the static method at the temperature range from 273.15 to 313.15 K under atmospheric pressure (101.1 kPa). The solubilities in mole fraction increased with increasing temperature and followed the order from high to low in the selected monosolvents: ethyl acetate > acetone > butyl acetate > (acetonitrile, toluene) > methanol > ethanol > n-propanol > n-butanol > isobutyl alcohol > isopropyl alcohol > cyclohexane; and for the ethyl acetate + ethanol mixture, the mole fraction solubilities of benzoin increased with the increase in temperature and ethyl acetate mass fraction. The obtained solubility of benzoin in neat solvents was correlated with the Apelblat equation, lambda h equation, and Wilson and NRTL models; and in solvent mixtures of ethyl acetate (w) + ethanol (1- w), with the Jouyban-Acree, van't Hoff-Jouyban-Acree and Apelblat-Jouyban-Acree models. The largest value of root-mean-square deviation was 4.02 X 10(-4), and relative average deviation was 2.36 x 10(-2). Furthermore, the mixing,enthalpy, mixing Gibbs energy, mixing entropy, activity coefficients under infinitesimal concentration, (y(1)(infinity)), and reduced excess enthalpy (H-1(E,infinity)) were deduced.