Solubility of aromatic hydrocarbon solids in mixtures of benzene and cyclohexane

Abstract

The solubilities of five solutes, biphenyl, naphthalene, fluorene, phenanthrene, and acenaphthene, In pure benzene and cyclohexane and In mixtures of benzene and cyclohexane, have been determined. The activity coefficients of the five solutes In cyclohexane are correlated to within an average of 0.6% by Wilson's equation compared to 9.3 % by the Scatchard-Hlldebrand expression. Similarly for the solutes In benzene, the activity coefficients were correlated to within an average of 0.5 % and 1.2%, respectively, by the same two methods. For the ternary mixtures Wilson's method correlates the activity coefficients for the 78 measured data points within 1.4% compared to 2.6% by the Scatchard-Hlldebrand expression. As expected, when the solution exhibits a significant deviation from Ideal behavior, regular solution theory becomes Inadequate and Wilson's equation Is proposed as a more appropriate correlation. The solubility data can also be correlated as functions of reduced temperature T"/T where 7m Is the melting point temperature.

IUPAC-NIST Solubility Data Series. 98. Solubility of Polycyclic Aromatic Hydrocarbons in Pure and Organic Solvent Mixtures—Revised and Updated. Part 3. Neat Organic Solvents

“…58 of the Solubility Data Series 2 at temperatures slightly greater than 298.15 K. McLauglin and Zainal 11 conducted acenaphthene solubility measurements from 308.7 to 334.0 K. Choi et al 12 subsequently determined the solubility at 303.4-354.5 K. There is approximately a 10%-15% relative deviation between the two independent sets of measurements. Analysis of the two datasets using Eq.…”

“…Original Measurements: (1) Acenaphthene; C 12 The authors employed a sum of symmetrized functions (SSF) to describe the activity coefficients of acenaphthene and hexatricontane calculated from the solid-liquid equilibrium data. The SSF model gave a calculated eutectic temperature of T/K ¼ 343.…”

“…Original Measurements: (1) Acenaphthene; C 12 Variables: Prepared by: T/K ¼ 298. 15 W. E. Acree, Jr.…”

“…Original Measurements: (1) Acenaphthene; C 12 The authors refer to the compound as 1,8-dihydroacenaphthalene, which the compiler has taken to be acenaphthene. …”

Comments on “Thermodynamic modeling studies of aqueous solubility of caffeine, gallic acid and their cocrystal in the temperature range of 303 K–363 K”

“…The purpose of the following commentary is to inform readers that the thermodynamic relationship used to calculate the activity coefficient of crystalline nonelectrolyte solutes contains additional terms [2,3]:…”