IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Nitromethane with Cyclohexane and Castor oil methyl esters

Components:
   (1) Castor oil methyl esters; ; []  NIST Chemistry WebBook for detail
   (2) Nitromethane; CH3NO2 ; [75-52-5]  NIST Chemistry WebBook for detail
   (3) Cyclohexane; C6H12; [110-82-7]  NIST Chemistry WebBook for detail

Original Measurements:
   Lakshmanan, C. M. and Laddha, G. S.; J. Madras Univ. 29, 97-102 (1959).

Variables:
   Temperature = 303 K

Prepared By:
   V. P. Sazonov

Experimental Remarks:

   The plait point composition: w₁ = 0.648, w₂ = 0.102, and w₃ = 0.250.

Experimental Data:   (Notes on the Nomenclature)

Table 1. Mutual solubility of nitromethane, cyclohexane and castor oil methyl esters
t/°C	T/K	Mass Fraction w₁	Mass Fraction w₂	Mass Fraction w₃
30	303	0.0392	0.9608	0.0000
30	303	0.0431	0.9067	0.0502
30	303	0.0704	0.7789	0.1508
30	303	0.1031	0.6400	0.2569
30	303	0.1872	0.4596	0.3532
30	303	0.2211	0.4034	0.3755
30	303	0.2736	0.3241	0.4023
30	303	0.3285	0.2638	0.4076
30	303	0.4171	0.1982	0.3847
30	303	0.5543	0.1317	0.3139
30	303	0.6044	0.1201	0.2755
30	303	0.6539	0.1005	0.2456
30	303	0.7108	0.0822	0.2070
30	303	0.7778	0.0662	0.1560
30	303	0.8857	0.0647	0.0496
30	303	0.9457	0.0543	0.0000

Table 2. Equilibrium tie line data for the ternary system
t/°C	T/K	Mass Fraction w₃	Comment(s)
30	303	0.0298	(1)-rich phase (OH value of esters = 198.6)
30	303	0.0447	(1)-rich phase (OHV = 188.6)
30	303	0.0632	(1)-rich phase (OHV = 186.3)
30	303	0.0669	(1)-rich phase (OHV = 186.3)
30	303	0.0806	(1)-rich phase (OHV = 185.0)
30	303	0.0889	(1)-rich phase (OHV = 184.7)
30	303	0.1037	(1)-rich phase (OHV = 179.9)
30	303	0.1451	(1)-rich phase (OHV = 175.1)
30	303	0.0819	(2)-rich phase (OHV = 148.3)
30	303	0.1532	(2)-rich phase (OHV = 159.2)
30	303	0.2592	(2)-rich phase (OHV = 155.1)
30	303	0.3114	(2)-rich phase (OHV = 154.6)
30	303	0.3535	(2)-rich phase (OHV = 157.4)
30	303	0.3802	(2)-rich phase (OHV = 156.6)
30	303	0.3984	(2)-rich phase (OHV = 158.5)
30	303	0.3957	(2)-rich phase (OHV = 163.7)

Notes:

Method/Apparatus/Procedure:
   The method (Othmer et al.¹) was used. Known mixtures of (1) and (3), or of (2) and (3), were held in a water bath and titrated with the third component until turbidity. Known mixtures of (1), (2) and (3) within the heterogeneous region were placed in the bath after agitation, and allowed to attain equilibrium. Two phases were seprated and weighted. The amount of (3) distributed in each phase was determined by taking a weighed quantity of each phase and distilling off the solvents on a water bath. Total weight of the esters thus obtained was checked against the weight of esters taken originally in the mixture.

Source and Purity of Materials:
   (1) Fluka AG; distilled over a rectification column; b. p. = (100.5 to 101.5) °C, n(30 °C, D) = 1.3770, d(30 °C, 4 °C) = 1.1237.
   (2) BDH Ltd.; rectified; b. p. = (80.5 to 81.5) °C, n(30 °C, D) = 1.4206, d(30 °C, 4 °C) = 0.7725.
   (3) Prepared by methylation of castor oil; dried and distilled; n(30 °C, D) = 1.4602, d(30 °C, 4 °C) = 0.9250 .

Estimated Errors:

   Temperature: control to ± 1 K.

References:
   ¹D. F. Othmer, R. E. White, and E. Trueger, Ind. Eng. Chem. 33, 1240 (1941).