Solubility System: Nitromethane with 1,2,3-Propanetriol and Octanoic acid
Components:

(1) Nitromethane, CH3NO2 ; [75-52-5] NIST WebBook
(2) 1,2,3-Propanetriol, C3H8O3; [56-81-5] NIST WebBook
(3) Octanoic acid, C8H16O2; [124-07-2] NIST WebBook

Original Measurements

Sazonov, V. P.; Zhilyaeva, I. N.; Zh. Fiz. Khim. 45, 733-4 (1971).

Variables:

Ambient temperature: 286 - 307 K

Prepared by:

N.V. Sazonov, V.P. Sazonov

Method/Apparatus/Procedure:

The synthetic method (Alekseev1) was used. Mixtures of (1), (2) and (3) of total mass 10g were heated with vigorous stirring to a temperature higher than the homogenization temperature, then slowly cooled until turbidity appeared. Heating and cooling cycles were repeated twice. Temperature values obtained for appearing and disappearing turbidity were averaged.

Source and Purity of Materials:
  1. Source not specified; pure grade reagent; dried and twice distilled in glass packed column.
  2. Source not specified, analytical purity; twice distilled at vacuum; 0.03 mass% of water by the Karl Fischer analysis.
  3. Source not specified, pure grade reagent; dried and twice distilled at vacuum.
Estimated Errors:

Ambient temperature: ±0.02 K.

References

1 Alekseev, V. F.; Zh. Russ. Fiz. -Khim. O-va 8, 249 (1876).

Experimental Values:
Note: The temperatures of phase transitions were determined in ternary mixtures with a constant mass content of (2), respectively, 2.5, 5.0, 7.5, 10.0, 20.0, 40.0, 70.0 mass % and also in ternary mixtures with constant mass relationship of (1) and (3) as 45.0:55.0, 57.5:42.5, and 70.0:30.0, respectively. L1 nitromethane-rich phase; L2 propanetriol-rich phase; L3 acid-rich phase. The phase which is being dissolved is indicated in the table.
Table 1. Solubility temperatures of the three liquid phases
T (°C) T (K) w1 w2 x1 x2
19.15 292.3 8.288 x 10-1 2.50 x 10-2 9.135 x 10-1 1.83 x 10-2
19.15 292.3 8.075 x 10-1 5.00 x 10-2 8.963 x 10-1 3.68 x 10-2
23.0 296.15 7.600 x 10-1 5.00 x 10-2 8.700 x 10-1 3.79 x 10-2
24.52 297.67 7.125 x 10-1 5.00 x 10-2 8.420 x 10-1 3.92 x 10-2
25.17 298.32 6.650 x 10-1 5.00 x 10-2 8.122 x 10-1 4.05 x 10-2
25.27 298.42 6.175 x 10-1 5.00 x 10-2 7.803 x 10-1 4.19 x 10-2
19.18 292.33 7.863 x 10-1 7.50 x 10-2 8.788 x 10-1 5.56 x 10-2
23.02 296.17 7.400 x 10-1 7.50 x 10-2 8.525 x 10-1 5.73 x 10-2
23.44 296.59 4.163 x 10-1 7.50 x 10-2 6.110 x 10-1 7.30 x 10-2
24.52 297.67 6.938 x 10-1 7.50 x 10-2 8.246 x 10-1 5.91 x 10-2
24.52 297.67 4.626 x 10-1 7.50 x 10-2 6.534 x 10-1 7.02 x 10-2
25.06 298.21 5.088 x 10-1 7.50 x 10-2 6.925 x 10-1 6.77 x 10-2
25.17 298.32 6.475 x 10-1 7.50 x 10-2 7.948 x 10-1 6.10 x 10-2
25.27 298.42 5.926 x 10-1 7.50 x 10-2 7.568 x 10-1 6.35 x 10-2
25.29 298.44 5.782 x 10-1 7.50 x 10-2 7.464 x 10-1 6.42 x 10-2
25.3 298.45 5.550 x 10-1 7.50 x 10-2 7.290 x 10-1 6.53 x 10-2
12.7 285.85 8.102 x 10-1 1.000 x 10-1 8.860 x 10-1 7.25 x 10-2
19.05 292.2 3.149 x 10-1 1.000 x 10-1 5.008 x 10-1 1.054 x 10-1
19.23 292.38 7.649 x 10-1 1.000 x 10-1 8.610 x 10-1 7.46 x 10-2
21.57 294.72 3.599 x 10-1 1.000 x 10-1 5.497 x 10-1 1.012 x 10-1
23.05 296.2 7.199 x 10-1 1.000 x 10-1 8.348 x 10-1 7.68 x 10-2
23.41 296.56 4.050 x 10-1 1.000 x 10-1 5.949 x 10-1 9.74 x 10-2
24.5 297.65 4.499 x 10-1 1.000 x 10-1 6.366 x 10-1 9.38 x 10-2
24.57 297.72 6.750 x 10-1 1.000 x 10-1 8.069 x 10-1 7.92 x 10-2
25.05 298.2 4.949 x 10-1 1.000 x 10-1 6.755 x 10-1 9.05 x 10-2
25.18 298.33 6.300 x 10-1 1.000 x 10-1 7.772 x 10-1 8.18 x 10-2
25.28 298.43 5.851 x 10-1 1.000 x 10-1 7.457 x 10-1 8.45 x 10-2
25.29 298.44 5.627 x 10-1 1.000 x 10-1 7.291 x 10-1 8.59 x 10-2
25.29 298.44 5.399 x 10-1 1.000 x 10-1 7.117 x 10-1 8.74 x 10-2
18.95 292.1 2.801 x 10-1 2.000 x 10-1 4.427 x 10-1 2.095 x 10-1
19.31 292.46 6.800 x 10-1 2.000 x 10-1 7.876 x 10-1 1.535 x 10-1
21.37 294.52 3.201 x 10-1 2.000 x 10-1 4.881 x 10-1 2.022 x 10-1
23.07 296.22 6.401 x 10-1 2.000 x 10-1 7.617 x 10-1 1.578 x 10-1
23.28 296.43 3.600 x 10-1 2.000 x 10-1 5.304 x 10-1 1.953 x 10-1
24.45 297.6 4.000 x 10-1 2.000 x 10-1 5.699 x 10-1 1.889 x 10-1
24.61 297.76 6.000 x 10-1 2.000 x 10-1 7.342 x 10-1 1.622 x 10-1
25.0 298.15 4.400 x 10-1 2.000 x 10-1 6.070 x 10-1 1.828 x 10-1
25.22 298.37 5.600 x 10-1 2.000 x 10-1 7.052 x 10-1 1.669 x 10-1
25.28 298.43 5.201 x 10-1 2.000 x 10-1 6.745 x 10-1 1.719 x 10-1
25.29 298.44 5.002 x 10-1 2.000 x 10-1 6.585 x 10-1 1.745 x 10-1
25.3 298.45 4.800 x 10-1 2.000 x 10-1 6.417 x 10-1 1.772 x 10-1
17.9 291.05 2.100 x 10-1 4.000 x 10-1 3.280 x 10-1 4.141 x 10-1
19.43 292.58 5.097 x 10-1 4.000 x 10-1 6.269 x 10-1 3.261 x 10-1
20.87 294.02 2.400 x 10-1 4.000 x 10-1 3.650 x 10-1 4.032 x 10-1
23.0 296.15 2.699 x 10-1 4.000 x 10-1 4.000 x 10-1 3.929 x 10-1
23.1 296.25 4.801 x 10-1 4.000 x 10-1 6.032 x 10-1 3.331 x 10-1
24.27 297.42 3.001 x 10-1 4.000 x 10-1 4.336 x 10-1 3.830 x 10-1
24.68 297.83 4.500 x 10-1 4.000 x 10-1 5.779 x 10-1 3.405 x 10-1
24.96 298.11 3.301 x 10-1 4.000 x 10-1 4.653 x 10-1 3.737 x 10-1
25.24 298.39 4.201 x 10-1 4.000 x 10-1 5.518 x 10-1 3.482 x 10-1
25.27 298.42 3.600 x 10-1 4.000 x 10-1 4.954 x 10-1 3.648 x 10-1
25.27 298.42 4.048 x 10-1 4.000 x 10-1 5.379 x 10-1 3.523 x 10-1
25.3 298.45 3.900 x 10-1 4.000 x 10-1 5.242 x 10-1 3.563 x 10-1
25.3 298.45 3.751 x 10-1 4.000 x 10-1 5.100 x 10-1 3.605 x 10-1
19.48 292.63 1.199 x 10-1 7.000 x 10-1 1.816 x 10-1 7.029 x 10-1
19.55 292.7 2.551 x 10-1 7.000 x 10-1 3.456 x 10-1 6.286 x 10-1
21.97 295.12 1.351 x 10-1 7.000 x 10-1 2.020 x 10-1 6.937 x 10-1
23.15 296.3 2.400 x 10-1 7.000 x 10-1 3.290 x 10-1 6.361 x 10-1
23.58 296.73 1.500 x 10-1 7.000 x 10-1 2.214 x 10-1 6.849 x 10-1
24.73 297.88 1.650 x 10-1 7.000 x 10-1 2.405 x 10-1 6.762 x 10-1
24.75 297.9 2.250 x 10-1 7.000 x 10-1 3.122 x 10-1 6.438 x 10-1
25.15 298.3 1.799 x 10-1 7.000 x 10-1 2.590 x 10-1 6.679 x 10-1
25.26 298.41 2.098 x 10-1 7.000 x 10-1 2.947 x 10-1 6.517 x 10-1
25.3 298.45 1.949 x 10-1 7.000 x 10-1 2.771 x 10-1 6.597 x 10-1

(a) Critical opalescence.

Table 2. Solubility temperatures of the two liquid phases
T (°C) T (K) w1 w2 x1 x2
14.2 287.35 2.438 x 10-1 2.50 x 10-2 4.278 x 10-1 2.91 x 10-2
19.85 293.0 2.925 x 10-1 2.50 x 10-2 4.892 x 10-1 2.77 x 10-2
23.16 296.31 7.801 x 10-1 2.50 x 10-2 8.873 x 10-1 1.88 x 10-2
23.62 296.77 3.412 x 10-1 2.50 x 10-2 5.450 x 10-1 2.65 x 10-2
25.61 298.76 7.313 x 10-1 2.50 x 10-2 8.593 x 10-1 1.95 x 10-2
26.09 299.24 3.900 x 10-1 2.50 x 10-2 5.962 x 10-1 2.53 x 10-2
26.9 300.05 6.825 x 10-1 2.50 x 10-2 8.294 x 10-1 2.01 x 10-2
27.27 300.42 4.387 x 10-1 2.50 x 10-2 6.430 x 10-1 2.43 x 10-2
27.71 300.86 6.337 x 10-1 2.50 x 10-2 7.974 x 10-1 2.08 x 10-2
28.16 301.31 4.876 x 10-1 2.50 x 10-2 6.863 x 10-1 2.33 x 10-2
28.21 301.36 5.850 x 10-1 2.50 x 10-2 7.631 x 10-1 2.16 x 10-2
28.32 301.47 5.606 x 10-1 2.50 x 10-2 7.449 x 10-1 2.20 x 10-2
28.33 301.48 5.363 x 10-1 2.50 x 10-2 7.261 x 10-1 2.24 x 10-2
16.75 289.9 2.850 x 10-1 5.00 x 10-2 4.753 x 10-1 5.53 x 10-2
20.37 293.52 3.324 x 10-1 5.00 x 10-2 5.302 x 10-1 5.29 x 10-2
22.83 295.98 3.800 x 10-1 5.00 x 10-2 5.807 x 10-1 5.06 x 10-2
24.3 297.45 4.275 x 10-1 5.00 x 10-2 6.270 x 10-1 4.86 x 10-2
25.03 298.18 4.750 x 10-1 5.00 x 10-2 6.698 x 10-1 4.67 x 10-2
25.38 298.53 5.225 x 10-1 5.00 x 10-2 7.094 x 10-1 4.50 x 10-2
25.42 298.57 5.700 x 10-1 5.00 x 10-2 7.461 x 10-1 4.34 x 10-2
25.5 298.65 5.463 x 10-1 5.00 x 10-2 7.281 x 10-1 4.42 x 10-2
19.19 292.34 3.238 x 10-1 7.50 x 10-2 5.156 x 10-1 7.92 x 10-2
21.71 294.86 3.700 x 10-1 7.50 x 10-2 5.652 x 10-1 7.59 x 10-2
25.31 298.46 6.746 x 10-1 3.63 x 10-2 8.217 x 10-1 2.93 x 10-2
25.6 298.75 6.768 x 10-1 3.31 x 10-2 8.238 x 10-1 2.67 x 10-2
26.02 299.17 6.793 x 10-1 2.96 x 10-2 8.263 x 10-1 2.39 x 10-2
26.57 299.72 6.816 x 10-1 2.63 x 10-2 8.285 x 10-1 2.12 x 10-2
26.91 300.06 6.826 x 10-1 2.49 x 10-2 8.295 x 10-1 2.01 x 10-2
27.3 300.45 6.842 x 10-1 2.26 x 10-2 8.311 x 10-1 1.82 x 10-2
28.25 301.4 6.868 x 10-1 1.89 x 10-2 8.336 x 10-1 1.52 x 10-2
29.32 302.47 6.894 x 10-1 1.51 x 10-2 8.362 x 10-1 1.21 x 10-2
30.45 303.6 6.922 x 10-1 1.11 x 10-2 8.389 x 10-1 8.9 x 10-3
31.58 304.73 6.948 x 10-1 7.4 x 10-3 8.414 x 10-1 5.9 x 10-3
32.96 306.11 6.975 x 10-1 3.6 x 10-3 8.440 x 10-1 2.9 x 10-3
25.33 298.48 5.433 x 10-1 5.52 x 10-2 7.246 x 10-1 4.88 x 10-2
25.39 298.54 5.442 x 10-1 5.35 x 10-2 7.257 x 10-1 4.73 x 10-2
25.5 298.65 5.462 x 10-1 5.01 x 10-2 7.280 x 10-1 4.43 x 10-2
25.69 298.84 5.484 x 10-1 4.63 x 10-2 7.306 x 10-1 4.09 x 10-2
25.91 299.06 5.504 x 10-1 4.28 x 10-2 7.329 x 10-1 3.78 x 10-2
26.26 299.41 5.525 x 10-1 3.91 x 10-2 7.354 x 10-1 3.45 x 10-2
26.37 299.52 5.531 x 10-1 3.81 x 10-2 7.361 x 10-1 3.36 x 10-2
26.73 299.88 5.549 x 10-1 3.50 x 10-2 7.382 x 10-1 3.09 x 10-2
27.31 300.46 5.572 x 10-1 3.10 x 10-2 7.409 x 10-1 2.73 x 10-2
27.94 301.09 5.594 x 10-1 2.72 x 10-2 7.435 x 10-1 2.40 x 10-2
28.56 301.71 5.615 x 10-1 2.34 x 10-2 7.460 x 10-1 2.06 x 10-2
29.39 302.54 5.638 x 10-1 1.95 x 10-2 7.486 x 10-1 1.72 x 10-2
30.27 303.42 5.659 x 10-1 1.58 x 10-2 7.511 x 10-1 1.39 x 10-2
31.34 304.49 5.684 x 10-1 1.15 x 10-2 7.540 x 10-1 1.01 x 10-2
32.49 305.64 5.705 x 10-1 7.8 x 10-3 7.565 x 10-1 6.9 x 10-3
33.66 306.81 5.727 x 10-1 4.0 x 10-3 7.590 x 10-1 3.5 x 10-3
23.55 296.7 4.206 x 10-1 6.53 x 10-2 6.172 x 10-1 6.35 x 10-2
23.65 296.8 4.210 x 10-1 6.44 x 10-2 6.178 x 10-1 6.26 x 10-2
23.82 296.97 4.238 x 10-1 5.83 x 10-2 6.217 x 10-1 5.67 x 10-2
23.93 297.08 4.244 x 10-1 5.68 x 10-2 6.226 x 10-1 5.52 x 10-2
24.09 297.24 4.264 x 10-1 5.24 x 10-2 6.255 x 10-1 5.09 x 10-2
24.21 297.36 4.270 x 10-1 5.11 x 10-2 6.263 x 10-1 4.97 x 10-2
24.77 297.92 4.306 x 10-1 4.31 x 10-2 6.315 x 10-1 4.19 x 10-2
25.14 298.29 4.322 x 10-1 3.95 x 10-2 6.337 x 10-1 3.84 x 10-2
25.52 298.67 4.339 x 10-1 3.58 x 10-2 6.361 x 10-1 3.48 x 10-2
26.6 299.75 4.371 x 10-1 2.86 x 10-2 6.407 x 10-1 2.78 x 10-2
27.31 300.46 4.391 x 10-1 2.42 x 10-2 6.436 x 10-1 2.35 x 10-2
28.33 301.48 4.413 x 10-1 1.93 x 10-2 6.467 x 10-1 1.87 x 10-2
29.41 302.56 4.434 x 10-1 1.47 x 10-2 6.497 x 10-1 1.43 x 10-2
30.25 303.4 4.448 x 10-1 1.16 x 10-2 6.517 x 10-1 1.13 x 10-2
31.34 304.49 4.466 x 10-1 7.6 x 10-3 6.542 x 10-1 7.4 x 10-3
32.42 305.57 4.483 x 10-1 3.8 x 10-3 6.566 x 10-1 3.7 x 10-3

(a) Critical opalescence.

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