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Solubility System: Nitroethane with 1,2-Ethanediol and 1-Dodecanol (Original Report)

Components:
(1) Nitroethane, C2H5NO2; [79-24-3] NIST Chemistry WebBook
(2) 1,2-Ethanediol, C2H6O2 ; [107-21-1] NIST Chemistry WebBook
(3) 1-Dodecanol, C12H26O; [112-53-8] NIST Chemistry WebBook
Original Measurements

Variables:
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Evaluated By:
Valerii P. Sazonov
Critical Review (-):
A survey of solubilities (soly) and liquid-liquid equilibrium data (equil.) for the system nitroethane + 1,2-ethanediol + 1-dodecanol is given in Table 1.

The system nitroethane + 1,2-ethanediol + 1-dodecanol includes a three-phase region. All three binary pairs of components, nitroethane + 1,2-ethanediol, nitroethane + 1-dodecanol and 1,2-ethanediol + 1-dodecanol are partially miscible. The data for the binary systems (1) + (2) and (1) + (3) were compiled and critically evaluated in this volume. Recommended data for the system 1,2-ethanediol + 1-dodecanol are not yet available. The reported values of UCST (upper critical solution temperature) of the binary systems are reported in Francis1 and Zhuravlev and Erofeeva2 and presented in Table 2.

Solubility data obtained by the synthetic method for the ternary system are reported in Francis1 and Zhuravlev and Erofeeva.2 Maximal temperature of the three-phase liquid equilibrium is reported to occur at 289.7 K (Francis1) and 291.8 K.2 Thus, the tentative value is: Tc = (291 ±1) K. Experimental errors were not reported in the papers. Depending on temperature the system nitroethane + 1,2-ethanediol + 1-dodecanol forms a miscibility gaps of Type I to IV. 3 In the temperature range 292 to 301.2 K,1 where the three binary systems are partially miscible, the solubility curves correspond to Type III3. Below 292 K the solubility curves correspond to Type IV. A three-phase region occurs below 291 K.1 In the temperature range 301.2 to 341.6 K, where the two binary systems nitroethane + 1,2-ethanediol and 1-dodecanol + 1,2-ethanediol are partially miscible, the solubility curves correspond to Type II.3 Above 341.6 K this ternary system has only one partially miscible region.

Liquid-liquid equilibrium data

Compositions of the coexisting two and three liquid phases for the ternary system nitroethane + 1,2-ethanediol + 1-dodecanol were reported in two references. Composition of each phase at 288 and 293 K, 2 was calculated from the index of refraction-composition curve of saturated mixtures prepared at the time of saturation curve measurements and are also presented in a graphical form. Compositions of three liquid phases in equilibrium reported in Francis1 were measured at 287 and 289 K and detailed information about experimental procedures is not reported. Experimental errors were not reported in the papers. All experimental data are considered tentative.

References:

(1) Francis, A. W. ; J. Phys. Chem. 60, 20-7 (1956).
(2) Zhuravlev, E. F. ; Erofeeva, L. F. ; Uch. Zap. ; Perm. Gos. Univ. 178, 10-7 (1968).
(3) Treybal, R. E. ; Liquid Extraction, McGraw-Hill, New York (1963).

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