Beysens and Tufeu⁷ determined of the variation of the critical temperature as a function of pressure (from 500 to 12500 kPa). All original data are compiled immediately following this Critical Evaluation.
              The data point for the nitroethane-rich phase at 298 K (Hsu and Clever³) is marked disagreement with other studies and is therefore rejected. The table below has been prepared on the basis of all other reported data. Values obtained by the evaluator by graphical interpolation or extrapolation from the data sheets are presented in the Table 2 and Table 3. Data are "recommended" if two or more apparently reliable studies are is reasonable (± 5 % relative) agreement. All other data are regarded as tentative only.

              The upper critical solution temperature (USCT) has been reported as 302.15 K,⁶ 302.7 K,² 303.0 K,¹ 303.18 K,⁴ and 303.20 K.⁵ The UCST of Battler and Rowley⁶ is rejected. Thus, the recommended value is: T_c = (303.0 ± 0.2) K.
              The corresponding critical solution composition has been reported as x_cl = 0.491 (Vreeland and Dunlap¹), x_cl = 0.569 (Beysens⁴) and x_cl = 0.5692 (Tanaka and Wada⁵). The x_cl of Vreeland and Dunlap¹ is rejected. The data average x_cl = 0.569. This value is recommended.
              The recommended and tentative values for the mutual solubility reported in Table 2 and Table 3 have been approximated by an equation based on the scaling law (described in the preface to this volume) for which the following parameters were derived: a₁ = 0.95870, a₂ = -0.24393, b₁ = 1.50442, b₂ = 1.68914 (mean standard error of estimate was 0.0118).
              For this approximation, recommended values of UCST and x_cl have been used. This relationship is presented in Fig. 7 together with experimental data reported in several references.^1,2,4

Experimental Data:   (Notes on the Nomenclature)