Solubilities in the system comprising nitromethane and nonane have been reported in two publications. Malesinska,1 between 296 and 393 K, and Rolla et al.,2 between 366 and 393 K, measured the mutual solubilities of (1) and (2) using the synthetic method.Values obtained by the graphical interpolation or extrapolation from the data sheets are presented in the following table. Data are "recommended" if two or more apparently reliable studies are in reasonable (± 5 % relative) agreement. All other data are regarded as tentative only.
The upper critical solution temperature has been reported as 393.45 K (Malesinska1) and 393.8 K (Rolla et al.2). Thus, the recommended value is (393.6 ± 0.2) K. The corresponding critical solution composition has been reported as xc1 = 0.695 (Rolla et al.2) and xc1 = 0.720 (Malesinska 1). Their average, xc1 = 0.708 ± 0.012, is recommended. These recommended values are consistent with the values calculated in the series nitromethane - n -alkane systems and described in the Introduction material to this volume "Relations of Solubility Data in Binary Systems Containing Nitromethane." The numerical values reported in the above table have been approximated by the equation based on scaling law and described also in the above introduction material to this volume. The following parameters have been adjusted:
a1 = 0.87100, a2 = -0.16820, b1 = 4.42121, b2 = -4.47626 (mean standard error of estimate was 0.0106).
For approximation the recommended values of UCST and xc1 have been used. This relationship is presented in Fig. 17 together with experimental data reported in Malesinska1 and Rolla et al.2