IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

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 Solubility System: Acetonitrile with 1-Octadecanol

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Components:
   (1) 1-Octadecanol; C18H38O; [112-92-5]  NIST Chemistry WebBook for detail
   (2) Acetonitrile; C2H3N; [75-05-8]  NIST Chemistry WebBook for detail

Evaluator:
   Valerii P. Sazonov and Nikolai V. Sazonov, Technical University, Samara, Russia, November, 2001

Critical Evaluation:

           Solubilities in the system comprising acetonitrile (1) and 1-octadecanol (2) have been reported in two publications. Hoerr et al.¹ studied the phase equilibrium of the liquid-liquid-solid system and the mutual solubility of (1) and (2) between 303 and 337 K by the synthetic method. Schmid et al.² measured of the upper critical temperature solution of components (1) and (2) in the course of a study of binary solubilities of acetonitrile and (C₁₀-C₂₀) alcohols. In addition to these data, Francis³ reported the upper critical solution temperature of this system.
        The upper critical solution temperature has been reported as 336.2 K,³ 336.8 K,¹ and 337.2 K,² these data are in reasonable agreement and thus their average value: UCST = 336.7 ± 0.4 K and is recommended. The corresponding critical solution composition has been calculated by evaluators as x_cl = 0.88 from the data of Hoerr et al.¹
        Monotectic equilibrium has been reported to occur at 325.7 K.¹
        All experimental values reported1 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 = 0.3143 a₂= 1.5386, b₁ = -0.4256, b₂ = -1.6183

(mean standard error of estimate was 0.0080).
         For approximation x_cl and UCST from Hoerr et al.¹ 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 results,¹ are also presented in Fig. 17.
        Solubilities in the system comprising acetonitrile (1) and 1-octadecanol (2) have been reported in two publications. Hoerr et al.¹ studied the phase equilibrium of the liquid-liquid-solid system and the mutual solubility of (1) and (2) between 303 and 337 K by the synthetic method. Schmid et al.² measured of the upper critical temperature solution of components (1) and (2) in the course of a study of binary solubilities of acetonitrile and (C₁₀-C₂₀) alcohols. In addition to these data, Francis³ reported the upper critical solution temperature of this system.
        The upper critical solution temperature has been reported as 336.2 K,³ 336.8 K,¹ and 337.2 K,² these data are in reasonable agreement and thus their average value: UCST = 336.7 ± 0.4 K and is recommended. The corresponding critical solution composition has been calculated by evaluators as x_cl = 0.88 from the data of Hoerr et al.¹
        Monotectic equilibrium has been reported to occur at 325.7 K.¹
        All experimental values reported1 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 = 0.3143 a₂= 1.5386, b₁ = -0.4256, b₂ = -1.6183

(mean standard error of estimate was 0.0080).
         For approximation x_cl and UCST from Hoerr et al.¹ 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 results,¹ are also presented in Fig. 17.

Experimental Data:   (Notes on the Nomenclature)

Calculated mutual solubility of acetonitrile (1) and 1-octadecanol (2)

T/K	102 * Mass Fraction w1	Mole Fraction x1	Comment(s)
328.2	21.2	0.640	Alcohol-rich phase
333.2	30.3	0.741	Alcohol-rich phase
334.2	33.1	0.765	Alcohol-rich phase
335.2	36.6	0.792	Alcohol-rich phase
335.7	39.0	0.808	Alcohol-rich phase
336.2	41.9	0.826	Alcohol-rich phase
336.4	43.4	0.835	Alcohol-rich phase
336.6	45.7	0.847	Alcohol-rich phase
328.2	85.5	0.975	Acetonitrile-rich phase
333.2	75.5	0.953	Acetonitrile-rich phase
334.2	72.7	0.946	Acetonitrile-rich phase
335.2	68.9	0.936	Acetonitrile-rich phase
335.7	66.8	0.930	Acetonitrile-rich phase
336.2	63.9	0.921	Acetonitrile-rich phase
336.4	62.3	0.916	Acetonitrile-rich phase
336.6	60.0	0.908	Acetonitrile-rich phase

View Figure 17 for this Evaluation

References: (Click a link to see its experimental data associated with the reference)

   1  Hoerr, C.W.; Harwood, H.J.; Ralston, A.W., J. Org. Chem. 9, 267 (1944).
   2  Schmid, H.H.O.; Mangold, H.K.; Lundberg, W.O., Microchem. J. 9, 134 (1965).
   3  Francis, A.W., Critical Solution Temperature, Washington, Adv. Chem. Ser. 31 (1961).

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Last updated: February 18, 2015 (Created: August 17, 2007)