Solubilities in the system nitroethane (1) + 1-nonanol (2) were reported in two publications. Zhuravleva et al.1carried out measurement of the mutual solubilities of the two components between 252 and 284 K by the synthetic method. Zhuravleva and Zhukova2 determined the mutual solubility of two components by the synthetic method between 266 and 290 K.
The upper critical solution temperature has been reported as 284.2 K (Zhuravleva et al.1) and 289.7 K;2) the difference is very large and is equal 5.5 K. Both result have been measured by the same main investigator. In the opinion of the evaluator the value 289.7 K (Zhuravleva and Zhukova2) should be treated as tentative because it was published one year later. It may be treated as the improved value and this value is in the agreement with other UCST of the nitroethane - alcohol systems published in this collection. Therefore the UCST reported in Zhuravleva et al.1 is rejected as well as other data from the Zhuravleva et al.1 Thus the tentative values of the critical point are those reported in Zhuravleva and Zhukova2: Tc = 289.7 K and xcl = 0.684. They were used in the approximation of solubility data. Monotectic equilibrium is realized at 265.9 K.2
The experimental data reported in Zhuravleva and Zhukova2 have been approximated (with the same weighing factor) by an equation based on the scaling law (described in the preface to this volume) for which the following parameters were derived:
a1 = 0.83415, a2 = 0.11334, b1 = 5.72965, b2 = -5.17458
(mean standard error of estimate was 0.0097).
For this approximation values of xcl = 0.684 and Tc = 289.7 have been used. In the opinion of the evaluator, all experimental solubility data and the smoothed mutual solubility, calculated by this equation, may be treated as tentative. The results of calculations for selected temperatures are presented in the following table. This relationship together with experimental points (Zhuravleva and Zhukova2) are also presented in Fig. 8.