Biphenyl with Cyclohexane (IUPAC SDS Volume 58)
Evaluator
William E. Acree, Jr. Department of Chemistry University of North Texas
Evaluation
Biphenyl solubilities in cyclohexane were retrieved from papers by Choi et al. (1), McLaughlin and Zainal (2), Acree et al. (3), Acree (4) and Chang (5). The first two studies report observed values at several temperatures, Acree et al. determined values at 303, 308 and 313 K, and the latter two studies give the mole fraction solubility at 298 K. There is not a prior reason to exclude any of the five studies from the critical evaluation.
Regressional analysis of the experimental data as Ln x1 versus 1/T yielded the following mathematical relationship:
Ln x1 = - 4295.7 (1/T) + 12.770 (r = 0.9975)
for variation of biphenyl solubility with absolute temperature (see graph below). Back-calculated solubility at 298 K is x1 = 0.1944, and differs by about 1 - 2% from experimental values of x1 = 0.1921 (4) and x1 = 0.190 (5).
Figure
Solubility graph
Sources:

1 Choi, P. B.; Williams, C. P.; Buehring, K. G.; McLaughlin, E.; J. Chem. Eng. Data 1985, 30, 403-409.
2 McLaughlin, E.; Zainal, H. A.; J. Chem. Soc. 1960, 3854-3857.
3 Acree Jr., W. E.; Pontikos, N. M.; Judy, C. L.; Int. J. Pharm. 1986, 31, 225-230.
4 Acree Jr., W. E.; Int. J. Pharm. 1984, 18, 47-52.
5 Chang, W.; Ph.D Dissertation, North Dakota State University, ND, 1969.