Quantitative solubility data in the system comprising nitromethane and 1-octanol have been reported in the four publications.Schmid et al.1 determined the upper critical solution temperature by synthetic method. Zhuravleva et al.2,3 carried out measurements of the mutual solubilities of (1) and (2) between 294 and 322 K by the synthetic method. Dewan and Menta4 defined the mutual solubility of components (1) and (2) at 303 K. Apart from the work of Schmid et al.,1 which did not contain sufficient information to justify its inclusion, all the available data are listed in the data sheets following this Critical Evaluation.
Values obtained by the graphical interpolation or extrapolation from the data sheets are presented in Table 1. 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 319.7 K (Ref. 1) and 322.2 K.2,3 The UCST values reported by Schmid et al.1 for many other systems are significantly lower than other data and have generally been rejected. Accordingly, the value of 322.2 K reported by Zhuravleva et al.2,3 is likely to be more realistic. The corresponding critical solution composition has been reported as xc1 = 0.706.2They were verified by the relationship of UCST in the nitromethane - alcohol series discussed at the beginning of this volume. This calculated UCST was equal 321.9 K and may be treated as tentative. Critical solution composition has been reported in Ref. 2 as xc1=0.706, while the value calculated on the basis of relationship in the series was equal to 0.711 and it may be also treated as tentative. The recommended and tentative values for the mutual solubility reported in Table 1 have been approximated by the equation based on scaling law (described in the Introduction to this volume) and the following parameters have been adjusted:
a1 = 0.86725, a2 = 0.09186, b1 = 6.54336, b2 = -6.19573(mean standard error of estimate was 0.0047).
For an approximation these tentative values of UCST and xc1, consistent in the series have been used. This relationship is presented in Fig. 27 together with experimental data reported in Refs 2, 3 and 4.