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Solubility System: Nitroethane with Methylcyclohexane (Original Report)

Components:
(1) Nitroethane, C2H5NO2; [79-24-3] NIST Chemistry WebBook
(2) Methylcyclohexane, C7H14; [108-87-2] NIST Chemistry WebBook
Original Measurements

Variables:
T = Ambient Temperature (K)
w1 = Mass Fraction (Component 1)
x1 = Mole Fraction (Component 1)
Evaluated By:
Valerii P. Sazonov
Critical Review (-):
Solubilities in the system nitroethane (1) + methylcyclohexane (2) were reported in three publications. Francis1determined the upper critical solution temperature. Clever et al.2 measured the mutual solubilities of the two components between 282 and 298 K by the synthetic method. Pyzuk et al.3 determined the upper critical solution temperature by the synthetic method and the critical solution composition.
The upper critical solution temperature has been reported as 294.5 K,1 295.2 K ,3 and 298.2 K.2 The corresponding critical solution composition has been reported as Ø*cl = 0.346, xc1 = 0.486.2 The experimental data reported in Clever et al.2 and Pyzuk et al.3 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 = 0.76790, a2 = 0.64079, b1 = -2.48127, b2 = 1.78400, (mean standard error of estimate was 0.0183).

For this approximation UCST and xcl from Clever et al.2 and Pyzuk et al.3 were used respectively. In the opinion of the evaluator, the smoothed mutual solubilities, calculated by this equation, may be treated as tentative. The results of calculations for the selected temperatures are presented in Table. This relationship together with experimental points (Clever et al.2) are also presented in Fig. 6.

Experimental Data:
T (K)w1 x1
283.211.5 x 10-20.145
288.216.0 x 10-20.2
293.222.0 x 10-20.27
294.223.5 x 10-20.287
295.225.4 x 10-20.308
296.227.5 x 10-20.332
297.230.5 x 10-20.365
297.531.8 x 10-20.379
297.632.4 x 10-20.385
297.732.9 x 10-20.391
297.833.6 x 10-20.398
297.934.3 x 10-20.406
298.035.3 x 10-20.416
T (K)w1 x1
283.278.5 x 10-20.827
288.272.9 x 10-20.779
293.265.5 x 10-20.713
294.263.5 x 10-20.695
295.261.3 x 10-20.674
296.258.5 x 10-20.648
297.254.7 x 10-20.612
297.553.1 x 10-20.597
297.652.5 x 10-20.591
297.751.9 x 10-20.585
297.851.0 x 10-20.577
297.950.2 x 10-20.569
298.049.1 x 10-20.558
Figures:
Figure 1

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