Liquid-liquid equilibrium, heat capacity and turbidity of binary solution nitrobenzene + n -pentadecane

The liquid-liquid coexistence curve, the isobaric heat capacity per unit volume and the turbidity for the binary solution of nitrobenzene + n-pentadecane have been measured at various temperatures. The upper consolute mole fraction x(c) of nitrobenzene and the upper consolute temperature T-c of the binary solution were determined to be x(c) = 0.696 and T-c = 307.298 K, respectively. The values of the critical exponents related to the width of the coexistence curve, the heat capacity, the osmotic compressibility and the correlation length were deduced and found to be in good agreements with that of the 3-D Ising universality. With the heat capacity data the asymmetric behavior of the diameter of the coexistence curve was studied in terms of the complete scaling theory. The critical amplitudes related to the above four quantities were used to calculate the universal scaling ratios and to confirm their theoretical predictions. (C) 2018 Published by Elsevier Ltd.