IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Nitromethane with Cycloheptane

Components:
   (1) Nitromethane; CH3NO2; [75-52-5]  NIST Chemistry WebBook for detail
   (2) Cycloheptane; C7H14; [291-64-5]  NIST Chemistry WebBook for detail

Original Measurements:
   Riccardi, R.; Franzosini, P.; Rolla, M., Z. Naturforsch. 23A, 1816-8 (1968).

Variables:
   Temperature = 362 K to 375 K

Prepared By:
   V. P. Sazonov

Experimental Remarks:

   The numerical data were not included in the original publication but were provided by Professor R. Riccardi at the request of the compiler.

Experimental Data:   (Notes on the Nomenclature)

Mutual solubility of nitromethane and cycloheptane
t/°C	T/K	10² * Mass Fraction w₁ (compiler)	Mole Fraction x₁	Comment(s)
88.8	362.0	-	-	Hydrocarbon-rich phase
88.8	362.0	77.9	0.850	Nitromethane-rich phase
96.2	369.4	-	-	Hydrocarbon-rich phase
96.2	369.4	70.3	0.792	Nitromethane-rich phase
96.3	369.5	23.7	0.333	Hydrocarbon-rich phase
96.3	369.5	-	-	Nitromethane-rich phase
97.3	370.5	-	-	Hydrocarbon-rich phase
97.3	370.5	68.7	0.779	Nitromethane-rich phase
98.7	371.9	26.2	0.363	Hydrocarbon-rich phase
98.7	371.9	-	-	Nitromethane-rich phase
99.3	372.5	-	-	Hydrocarbon-rich phase
99.3	372.5	64.3	0.743	Nitromethane-rich phase
100.2	373.4	30.6	0.415	Hydrocarbon-rich phase
100.2	373.4	-	-	Nitromethane-rich phase
100.8	374.0	36.2	0.477	Hydrocarbon-rich phase
100.8	374.0	-	-	Nitromethane-rich phase
100.9	374.1	39.4	0.511	Hydrocarbon-rich phase
100.9	374.1	-	-	Nitromethane-rich phase
101.3	374.5	47.2	0.590	Hydrocarbon-rich phase
101.3	374.5	-	-	Nitromethane-rich phase
101.4	374.6	-	-	Hydrocarbon-rich phase
101.4	374.6	55.8	0.670	Nitromethane-rich phase
101.4	374.6	-	-	Hydrocarbon-rich phase
101.4	374.6	- (UCST)	-	Nitromethane-rich phase

Method/Apparatus/Procedure:
   The synthetic method¹ was used. Tubes were filled under vacuum with known masses of degassed and moisture-free components, sealed, and then placed in a thermostat bath filled with paraffin oil. The mixtures in the tubes were shaken by a Chemap vibromixer type E-1. Temperatures were measured with Degussa Pt resistance thermometers, which were checked against standards. Phase changes (cloud points) were observed as mixtures were cooled.

Source and Purity of Materials:
   (1) Fluka AG; purity 99 mole %; fractionally distilled, degassed and finally distilled through a P₂O₅ filled tube.
   (2) Fluka AG; purity 99 mole %; purification as above.

Estimated Errors:

   Temperature: reproduced better than 0.1K.

References:
   ¹ P. Franzosini, Z. Naturforsch. 18A, 224 (1963).