Solubilities in the system comprising acetonitrile (1) and 1-dodecanol (2) have been reported in four publications. Hoerr et al.¹ studied the phase equilibrium of the liquid-liquid-solid system and the mutual solubility of (1) and (2) between 273 and 309 K by the synthetic method. Francis² determined the upper critical solution temperature of (1) and (2) by the synthetic method. Schmid et al.³ measured of the upper critical temperature solution of components (1) and (2) in the course of a study of solubilities of binary systems of acetonitrile and (C₁₀-C₂₀) alcohols. Sazonov and Gudkina⁴ defined the mutual solubilities of acetonitrile and 1-dodecanol between 299 and 308 K by the synthetic method.
The upper critical solution temperature has been reported as 307.7 K,³ 308.4 K,² 308.45 K,⁴ and 308.9 K,¹ these data are in reasonable agreement and thus their average value: UCST = 308.4 ±0.5 K and is recommended. The corresponding critical solution composition has been reported as x_cl = 0.788.⁴
Monotectic equilibrium has been reported to occur at 293.2 K.¹
All experimental values reported ^1,4 have been approximated by an equation based on the scaling law (described in the introduction to this volume) for which the following parameters have been derived:

a₁ = 0.6791, a₂= 0.7569, b₁ = -0.4051, b₂ = -1.8542

(mean standard error of estimate was 0.0105).
For approximation x_cl and UCST⁴ have been used. In the opinion of the evaluators, the mutual solubilities calculated by this equation may be treated as tentative. The results of calculations for the selected temperatures are presented in the following table. This relationship, together with experimental points,^1,4 are also presented in Fig. 14.