IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Nitromethane with 1,2-Ethanediol

Components:
   (1) Nitromethane; CH3NO2; [75-52-5]  NIST Chemistry WebBook for detail
   (2) 1,2-Ethanediol; C2H6O2; [107-21-1]  NIST Chemistry WebBook for detail

Evaluator:
   V. P. Sazonov, Technical University, Samara, Russia May, 1996.

Critical Evaluation:

   Quantitative solubility data for the system nitromethane + 1,2-ethanediol have been reported in the publications listed in Table 1.

Apart from Schmid et al.,³ which did not contain sufficient information to justify its inclusion, all the original data are given in the data sheets following this Critical Evaluation.

In the tables that follow, values obtained by the evaluators by graphical interpolation or extrapolation from the data sheets are indicated by an asterisk (*). "Best" values have been obtained by simple averaging. The uncertainty limits (σ_n) attached to these values do not have statistical significance and should be regarded only as a convenient representation of the spread of values rather than as error limits. The letter (R) designates "recommended" data. Data are "recommended" if two or more apparently reliable studies are in reasonable (± 5 % relative) agreement. All other data are regarded as tentative only.

Table 2 summarizes the available data for the solubility of nitromethane in 1,2-ethanediol, with the exception of the data of Markuzin and Nikanorova² whose glycol-rich phase data disagree markedly from all other studies and are rejected.

The numerical values reported in the tables above have been approximated by the equation based on scaling law (described in the Introduction material to this volume "Relations of Solubility Data in Binary Systems Containing Nitromethane") and the following parameters have been adjusted:

a₁ = 0.78077, a₂ =0.00602, b1 =-0.23990, b2 =-0.05808

(mean standard error of estimate was 0.0275).
For approximation the recommended values of UCST and x_c1 have been used. The calculated compositions are inside declared in the tables inaccuracy at the each point. The calculated relationship is presented in Fig. 22 together with the "best" values from the above tables.

The upper critical solution temperature has been reported as 312.2 K,³ 312.9 K,¹ 313.17 K,⁶ 314.2 K,⁵ and 314.5 K⁴. The UCST of Schmid et al.³ is rejected. The remaining values give an average recommended value of: UCST = 313.7 ± 0.6 K.

The corresponding critical solution composition has been reported as x_c1 = 0.624,^1,6 x_c1 = 0.6309, and x_c1 = 0.644.⁵ The average of these values, x_c1 = 0.633 ± 0.008, (100 w₁ = 62.9) has a spread which is equal to the estimated error given by Sazonov⁶ and is recommended.

Experimental Data: (Notes on the Nomenclature)

Table 1. Summary of Solubilty Data for the System Nitromethane + 1, 2-ethanediol
Author	T/K	Reference	Solubility	Method
Francis	273-313	1	Mutual	Synthetic
Markuzin and Nikanorova	301, 313	2	Mutual	Titration
Schmid et al.	312	3	UCST	Synthetic
Burdykina and Zhuravlev	278-314	4	Mutual	Synthetic
Zhuravlev et al.	289-314	5	Mutual	Synthetic
Sazonov and Filippov	297-313	6	Mutual	Synthetic
Salvi and Van Hook	309-314^a	7	Mutual	Synthetic

Table 2. Tentative and Recommended (R) Values for the Solubility of Nitromethane (1) in 1, 2-ethanediol (2)
T/K	Reference	Sol. Power	Solubility	Sol. Note	Best Sol. Power	Best Solubility	Best Sol. Note	x₁
273	1	2	20.0	w1	2	20.0	w1	0.203
278	1, 4	2	21.5*, 23.1	w1	2	22.3± 0.8 (R)	w1	0.226
283	1, 5	2	23.0, 23.2*	w1	2	23.1 ± 0.1 (R)	w1	0.234
288	1	2	24.7*	w1	2	24.7	w1	0.250
293	1, 4, 5	2	27.0, 28.1, 27.1	w1	2	27.4 ± 0.5 (R)	w1	0.277
298	1, 6	2	29.6, 29.8	w1	2	29.7 ± 0.1 (R)	w1	0.301
303	1, 4, 5, 6	2	33.3, 34.3, 33.4, 33.3	w1	2	33.6 ± 0.6 (R)	w1	0.340
308	1, 6	2	40.0, 38.7	w1	2	39.4 ± 0.6 (R)	w1	0.398
311	1, 6, 7	2	48.0, 45.0, 49.2*	w1	2	47 ± 2 (R)	w1	0.47
313	2, 6, 7	2	59.0, 59.7, 59.6*	w1	2	59.4 ± 0.3 (R)	w1	0.598

Table 3. Tentative and Recommended (R) Values for the Solubility of 1, 2-ethandiol (2) in Nitromethane (1)
T/K	Reference	Sol. Power	Solubility	Sol. Note	Best Sol. Power	Best Solubility	Best Sol. Note	x₂
273	1	2	3.0	w2	2	3.0	w2	0.029
278	1, 4	2	3.5, 3.1	w2	2	3.3 ± 0.2	w2	0.032
283	1	2	4.0*	w2	2	4.0	w2	0.039
288	1	2	4.8*	w2	2	4.8	w2	0.047
293	1, 4, 5	2	6.0, 5.9, 5.8*	w2	2	5.9 ± 0.1 (R)	w2	0.058
298	1, 6	2	7.6, 7.9	w2	2	7.8 ± 0.2 (R)	w2	0.077
303	1, 4, 6	2	10.8, 9.3, 10.6*	w2	2	10.2 ± 0.6	w2	0.101
308	1, 6	2	18.0, 14.6*	w2	2	16 ± 2	w2	0.16
311	1, 6, 7	2	25.0, 19.4, 21.3*	w2	2	22 ± 2	w2	0.22
313	6, 7	2	34.1, 35.5*	w2	2	34.8 ± 0.7 (R)	w2	0.344

View Figure 22 for this Evaluation

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

   1  Francis, A.W., J. Phys. Chem. 60, 20-7 (1956).
   2  Markuzin, N.P.; Nikanorova, L.A., Zh. Obshch. Khim. 32, 3469 (1962).
   3  H.H.O. Schmid; Mangold, H.K.; Lundberg, W.O., Microchem. J. 11, 376-83 (1966).
   4  Burdykina, P.I.; Zhuravlev, E.F., Zh. Fiz. Khim. 42, 1925-9 (1968).
   5  Zhuravleva, I.K.; Zhuravlev,E.F.; Cherkasova, N.M., Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol. 14, 1010-3 (1971).
   6  Sazonov, V.P.; Filippov, V.V., Izv. Vyssh. Uchebn. Zaved., Khim. Khim. Tekhnol. 18, 222-5(1975).
   7  Salvi, M.V.; Van Hook, W.A., J. Phys. Chem. 94, 7812 (1990).