IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

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 Solubility System: Nitromethane with 1,2-Ethanediol and Heptane

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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
   (3) Heptane; C7H16; [142-82-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Sazonov, V. P.; Zhilyaeva, I. N. and Filippov, V. V.; Zh. Fiz. Khim. 47, 474 (1973); Deposited Doc., VINITI 4960 (1972).

Variables:
   Temperature = 298 K to 315 K

Prepared By:
   V. P. Sazonov

Experimental Remarks:

   The temperatures of phase transitions were determined in ternary mixtures with a constant mass content of (3), respectively, 1.0, 3.0, 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, 65.0:35.0, and 75.0:25.0. L₁ nitromethane-rich phase; L₂ ethanediol-rich phase; L₃ heptane-rich phase. The phase, which is being dissolved, is indicated in the table.

Experimental Data:   (Notes on the Nomenclature)
  

Table 1. Solubility temperatures of the three liquid phases

t/°C	T/K	Mass Fraction w1	Mass Fraction w2	Mole Fraction x1 (compiler)	Mole Fraction x2 (compiler)
26.13 (L2)	299.28	0.8973	0.0727	0.9091	0.0724
26.42 (L1)	299.57	0.2910	0.6790	0.2978	0.6835
31.41 (L2)	304.56	0.8730	0.0970	0.8848	0.0967
32.88 (L1)	306.03	0.3396	0.6304	0.3473	0.6340
36.97 (L1)	310.12	0.3880	0.5820	0.3965	0.5848
37.27 (L2)	310.42	0.8245	0.1455	0.8363	0.1451
39.66 (L1)	312.81	0.4365	0.5335	0.4457	0.5356
40.28 (L2)	313.43	0.7760	0.1940	0.7878	0.1937
40.88 (L1)	314.03	0.4850	0.4850	0.4948	0.4866
41.26 (L2)	314.41	0.7275	0.2425	0.7391	0.2423
41.52 (L1)	314.67	0.5335	0.4365	0.5438	0.4376
41.77 (L2)	314.92	0.6790	0.2910	0.6904	0.2910
41.78 (L1)	314.93	0.5820	0.3880	0.5928	0.3886
41.87 (a)	315.02	0.6305	0.3395	0.6416	0.3398
26.83 (L1)	299.98	0.2850	0.6650	0.2940	0.6746
26.86 (L2)	300.01	0.8787	0.0713	0.8973	0.0716
31.77 (L2)	304.92	0.8546	0.0954	0.8730	0.0958
32.72 (L1)	305.87	0.3325	0.6175	0.3427	0.6259
36.81 (L1)	309.96	0.3800	0.5700	0.3913	0.5773
37.18 (L2)	310.33	0.8075	0.1425	0.8256	0.1433
39.53 (L1)	312.68	0.4275	0.5225	0.4399	0.5288
40.09 (L2)	313.24	0.7600	0.1900	0.7776	0.1912
40.82 (L1)	313.97	0.4750	0.4750	0.4884	0.4803
41.26 (L2)	314.41	0.7125	0.2375	0.7296	0.2392
41.52 (L1)	314.67	0.5225	0.4275	0.5368	0.4319
41.79 (L1)	314.94	0.5700	0.3800	0.5851	0.3836
41.83 (L2)	314.98	0.6648	0.2852	0.6813	0.2875
41.87 (a)	315.02	0.6175	0.3325	0.6334	0.3354
26.53 (L2)	299.68	0.8325	0.0675	0.8674	0.0692
26.77 (L1)	299.92	0.2700	0.6300	0.2841	0.6518
31.18 (L2)	304.33	0.8100	0.0900	0.8443	0.0922
32.88 (L1)	306.03	0.3150	0.5850	0.3312	0.6048
36.86 (L1)	310.01	0.3600	0.5400	0.3782	0.5578
37.06 (L2)	310.21	0.7650	0.1350	0.7980	0.1385
39.61 (L1)	312.76	0.4050	0.4950	0.4251	0.5110
40.17 (L2)	313.32	0.7200	0.1800	0.7516	0.1848
40.88 (L1)	314.03	0.4500	0.4500	0.4720	0.4641
41.43 (L2)	314.58	0.6750	0.2250	0.7052	0.2312
41.77 (L1)	314.92	0.5400	0.3600	0.5655	0.3707
41.78 (L2)	314.93	0.6300	0.2700	0.6587	0.2776
41.87 (a)	315.02	0.5850	0.3150	0.6121	0.3241
25.82 (L1)	298.97	0.2400	0.5600	0.2630	0.6035
26.36 (L2)	299.51	0.7400	0.0600	0.8036	0.0641
31.08 (L2)	304.23	0.7200	0.0800	0.7822	0.0855
33.18 (L1)	306.33	0.2800	0.5200	0.3066	0.5600
36.61 (L1)	309.76	0.3200	0.4800	0.3502	0.5165
37.23 (L2)	310.38	0.6791	0.1209	0.7383	0.1292
39.29 (L1)	312.44	0.3600	0.4400	0.3936	0.4731
40.01 (L2)	313.16	0.6400	0.1600	0.6963	0.1712
40.88 (L1)	314.03	0.4000	0.4000	0.4771	0.4298
41.27 (L2)	314.42	0.6000	0.2000	0.6532	0.2141
24.82 (L1)	297.97	0.1800	0.4200	0.2151	0.4937
27.36 (L2)	300.51	0.5550	0.0450	0.6584	0.0525
31.71 (L1)	304.86	0.2100	0.3900	0.2508	0.4581
32.63 (L2)	305.78	0.5400	0.0600	0.6408	0.0700
36.18 (L1)	309.33	0.2400	0.3600	0.2865	0.4226
37.91 (L2)	311.06	0.5100	0.0900	0.6056	0.1051
39.07 (L1)	312.22	0.2700	0.3300	0.3221	0.3872
40.77 (L2)	313.92	0.4800	0.1200	0.5703	0.1402
40.82 (L1)	313.97	0.3000	0.3000	0.3577	0.3518
41.53 (L1)	314.68	0.3300	0.2700	0.3932	0.3164
41.58 (L2)	314.73	0.4500	0.1500	0.5350	0.1754
41.75 (L2)	314.90	0.4200	0.1800	0.4996	0.2105
41.78 (L1)	314.93	0.3600	0.2400	0.4287	0.2811
41.87 (a)	315.02	0.3900	0.2100	0.4642	0.2458
27.98 (L1)	301.13	0.1050	0.1950	0.1452	0.2652
30.76 (L2)	303.91	0.2775	0.0225	0.3822	0.0305
33.37 (L1)	306.52	0.1200	0.1800	0.1659	0.2447
34.03 (L2)	307.18	0.2700	0.0300	0.3719	0.0407
37.36 (L1)	310.51	0.1350	0.1650	0.1865	0.2242
39.28 (L2)	312.43	0.2550	0.0450	0.3514	0.0610
39.97 (L1)	313.12	0.1500	0.1500	0.2072	0.2038
41.07 (L2)	314.22	0.2400	0.0600	0.3308	0.0813
41.41 (L1)	314.56	0.1650	0.1350	0.2278	0.1833
41.78 (L1)	314.93	0.1800	0.1200	0.2485	0.1629
41.82 (L2)	314.97	0.2250	0.0750	0.3103	0.1017
41.87 (L1)	315.02	0.1950	0.1050	0.2691	0.1425
41.97 (a)	315.12	0.2100	0.0900	0.2897	0.1221
39.62 (L1)	312.77	0.4447	0.5436	0.4508	0.5420
39.62 (L1)	312.77	0.4408	0.5387	0.4484	0.5389
39.62 (L1)	312.77	0.4389	0.5365	0.4472	0.5375
41.87 (a)	315.02	0.6359	0.3424	0.6450	0.3416
41.87 (a)	315.02	0.6332	0.3410	0.6433	0.3407
41.87 (a)	315.02	0.6297	0.3391	0.6411	0.3395
41.17 (L2)	314.32	0.7310	0.2437	0.7413	0.2431
41.17 (L2)	314.32	0.7272	0.2424	0.7390	0.2422

Table 2. Solubility temperatures of the two liquid phases

t/°C	T/K	Mass Fraction w1	Mass Fraction w2	Mole Fraction x1 (compiler)	Mole Fraction x2 (compiler)
25.87	299.02	0.9160	0.0740	0.9207	0.0731
26.32	299.47	0.2970	0.6930	0.3016	0.6922
31.86	305.01	0.8910	0.0990	0.8960	0.0979
32.87	306.02	0.3465	0.6435	0.3516	0.6422
36.38	309.53	0.8415	0.1485	0.8469	0.1470
37.17	310.32	0.3960	0.5940	0.4015	0.5923
39.17	312.32	0.7920	0.1980	0.7977	0.1962
39.31	312.46	0.4455	0.5445	0.4513	0.5425
40.28	313.43	0.7425	0.2475	0.7485	0.2454
40.32	313.47	0.4950	0.4950	0.5011	0.4927
40.79	313.94	0.6930	0.2970	0.6992	0.2947
40.83	313.98	0.5445	0.4455	0.5507	0.4431
40.88	314.03	0.5940	0.3960	0.6003	0.3935
41.02 (a)	314.17	0.6440	0.3460	0.6503	0.3436
39.72	312.87	0.7476	0.2492	0.7516	0.2464
40.03	313.18	0.7446	0.2482	0.7498	0.2458
40.21	313.36	0.7430	0.2477	0.7488	0.2455
40.37	313.52	0.7407	0.2469	0.7474	0.2450
40.72	313.87	0.7377	0.2459	0.7455	0.2444
40.86	314.01	0.7362	0.2454	0.7446	0.2441
41.02	314.17	0.7337	0.2446	0.7430	0.2436
40.22	313.37	0.6479	0.3489	0.6525	0.3455
41.02	314.17	0.6432	0.3463	0.6436	0.3439
41.33	314.48	0.6414	0.3454	0.6485	0.3434
41.72	314.87	0.6392	0.3442	0.6471	0.3427
38.32	311.47	0.4488	0.5485	0.4534	0.5449
38.67	311.82	0.4473	0.5468	0.4524	0.5439
39.07	312.22	0.4462	0.5453	0.4518	0.5430

Notes:
   Table 1  ^a  Critical opalescence   
   Table 2  ^a  Critical opalescence  

Method/Apparatus/Procedure:
   The synthetic method (Alekseev¹) was used. Mixtures of (1), (2) and (3) of mass 10 g were heated with vigorous stirring to a temperature higher than the homogenization temperature, and 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 a glass packed column; n(20 °C, D) = 1.3820, d(20 °C, 4 °C) = 1.1381.
   (2) Source not specified; analytical purity; dried and repeatedly distilled under vacuum; n(20 °C, D) = 1.4320.
   (3) Source not specified; pure grade reagent; dried and fractionated through a laboratory column.

Estimated Errors:

   Temperature: ± 0.01 K.

References:
   ¹V. F. Alekseev, Zh. Russ. Fiz.-Khim. Ova 8, 249(1876).

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