IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: 2-Methylpentane with Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) 2-Methylpentane; C6H14; [107-83-5]  NIST Chemistry WebBook for detail

Evaluator:
   M.C. Haulait-Pirson, Department of Chemistry, University of Leuven, Belgium.
G.T. Hefter, School of Mathematical and Physical Sciences, Murdoch University, Perth, W.A., Australia. November 1984.

Critical Evaluation:

   Quantitative solubility data for the system 2-methylpentane (1) and water (2) have been reported in the publications listed in Table 1.

The original data in all of these publications are compiled in the data sheets immediately following this Critical Evaluation.

Connolly (ref 1) has reported solubilities of (1) in (2) at elevated pressures (Table 1) and determined an upper critical solution temperature of 625K at 31 MPa. However, as no other data are available under comparable conditions, no critical evaluation of his results can be made. The interested user is referred to the relevant Data Sheets for experimental values. For convenience, further discussion of this system will be divided into two parts.

1. SOLUBILITY OF 2-METHYLPENTANE (1) IN WATER (2)

The solubility data for 2-methylpentane in water are listed in Table 2 and plotted in Figure 1 with the exceptions noted below.

The datum of Krzyzanowska and Szeliga (ref 6) has been excluded because it does not appear to be independent of that of Price (ref 5). The data of Connolly (ref 1) have already been discussed above.

The datum of Polak and Lu (ref 4) at 298K is somewhat higher than those reported by others (ref 2, 3, 5). Also their value at 273K, as with other hydrocarbons investigated by these authors, shows an unusually large increase over the value at 298K. Their data are therefore rejected. At temperatures other than 298K only the data of Price (ref 5) are available and thus must be considered “Tentative”.

2. THE SOLUBILITY OF WATER (2) IN 2-METHYLPENTANE

The solubility of water in 2-methylpentane has been reported only by Polak and Lu (ref 4) and thus no Critical Evaluation can be made. However, it can be noted that the data of these authors are generally close to "Recommended" values in well characterized systems. The interested user is referred to the appropriate data sheet for solubility values.

Experimental Data:   (Notes on the Nomenclature)

Table 1. Quantitative Solubility Studies of the 2-Methylpentane (1) - Water (2) System
Author	T/K	T/KNote	Reference	Solubility	Method
Connolly	573-628	a	1	(1) in (2)	cloud-point
McAuliffe	298	-	2	(1) in (2)	GLC
Leinonen and Mackay	298	-	3	(1) in (2)	GLC
Polak and Lu	273, 298	-	4	mutual	GLC, Karl Fischer
Price	298-423	-	5	(1) in (2)	GLC
Krzyzanowska and Szeliga	298	-	6	(1) in (2)	GLC

Table 2. Recommended (R) and Tentative Values for the Solubility of 2-Methylpentane (1) in Water (2)
T/K	Reference	Sol. Power	Solubility	Sol. Note	Best Sol. Power	Best Solubility	Best Sol. Note	x₁ Power	x₁	x₁ Note
298	2, 3, 5	3	1.38, 1.42, 1.30 g(1)/100g sln	a	3	1.37 ± 0.05 (R) g(1)/100g sln	b	6	2.87 (R)	b
303	5	3	1.3* g(1)/100g sln	a	3	1.3 g(1)/100g sln	b	6	2.7	b
313	5	3	1.4* g(1)/100g sln	a	3	1.4 g(1)/100g sln	b	6	2.9	b
323	5	3	1.5* g(1)/100g sln	a	3	1.5 g(1)/100g sln	b	6	3.1	b
343	5	3	1.7* g(1)/100g sln	a	3	1.7 g(1)/100g sln	b	6	3.6	b
363	5	3	2.3* g(1)/100g sln	a	3	2.3 g(1)/100g sln	b	6	4.8	b
383	5	3	3.6* g(1)/100g sln	a	3	3.6 g(1)/100g sln	b	6	7.5	b
403	5	3	6.8* g(1)/100g sln	a	3	6.8 g(1)/100g sln	b	6	14	b
423	5	3	11.6* g(1)/100g sln	a	3	12 g(1)/100g sln	b	6	25	b

View Figure 1 for this Evaluation

Notes:
Table 1^a  At elevated pressures, p = 14-70 MPa
Table 2^a  Values marked with an asterisk ( * ) obtained by graphical interpolation of original measurements by the Evaluators.
Table 2^b  "Best" values obtained by averaging where appropriate; σ_n has no statistical significance.

References: (Click a link to see its experimental data associated with the reference)

   1  Connolly, J.F., J. Chem. Eng. Data 1966, 11, 13-6.
   2  McAuliffe, C., J. Phys. Chem. 1966, 70, 1267-75.
   3  Leinonen, P.J.; Mackay, D., Can. J. Chem. Eng. 1973, 51, 230-3.
   4  Polak, J.; Lu, B.C.Y., Can. J. Chem. 1973, 51, 4018-23.
   5  Price, L.C., Am. Assoc. Petrol. Geol. Bull. 1976, 60, 213-44.
   6  Krzyzanowska, T.; Szeliga, J., Nafta (Katowice) 1978, 12, 413-7.