SDS Volume (4540)
Volume 72. Nitromethane with Water or Organic Solvents: Ternary and Quaternary Systems, p None
Original Measurements
Sazonov, V. P.; Zh. Fiz. Khim. 45, 473-4 (1971).
Variables:
Room Temp: 278 - 304 $\pu{K}$
Prepared by:
Method/Apparatus/Procedure:
The synthetic method (Alekseev [1]) was used. Ampoules with given amount of (1), (2) and (3) were heated with vigorous stirring to a temperature somewhat higher than the phase transition temperature and then were slowly cooled till turbidity appeared. Then the turbidity disappearance temperature was determined when heated at a slow rate.
Source and Purity of Materials:
- Source not specified; pure grade reagent; dried and repeatedly distilled in a packed glass column; $n_{D}^{20}$ = 1.3819, $d_{4}^{20}$ = 1.1380.
- Source not specified; pure grade reagent; dried and repeatedly distilled at vacuum; $n_{D}^{20}$ = 1.4279, $d_{4}^{20}$ = 0.9090.
- Twice distilled.
Estimated Errors:
Ambient temperature: ±0.01 K.
References
1 Alekseev, V. F.; Zh. Russ. Fiz. -Khim. O-va 8, 249 (1876).
Components:
- Nitromethane, $\ce{ CH3NO2 }$; [75-52-5] NIST WebBook
- Octanoic acid, $\ce{ C8H16O2 }$; [124-07-2] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
The temperatures of phase transitions were determined in ternary mixtures with a constant mass content of (3), respectively 1.25, 2.50, 3.75, 5.0, 10.0, 20.0, 40.0, and 70.0 mass %, and also in ternary mixtures with a constant mass relationship of (1) and (2), respectively, 45.0:55.0, 57.5:42.5, and 70.0:30.0. L1 nitromethane-rich phase; L2 acid-rich phase; L3 water-rich phase. The phase which is being dissolved is indicated in the table.
Table 3. Composition of three coexisting liquid phases system nitromethane + octanoic acid + water*
| $T$ (°C) | $T$ ($\pu{K}$) | w1 | w2 | $x_{1}$ | $x_{2}$ |
|---|---|---|---|---|---|
| 9 | 282 | 0.662 | 0.259 | 0.637 | 0.106 |
| 9 | 282 | 0.446 | 0.482 | 0.499 | 0.228 |
| 9 | 282 | 0.032 | 1 x 10-3 | 9.7 x 10-3 | 1 x 10-4 |
(a) Critical opalescence.
(a) Critical opalescence.
(*) These data were extracted graphically by the compilers.
(b) Solubility temperature of solid phase.
