IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: 2,3-Dimethylbutane with Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) 2,3-Dimethylbutane; C6H14; [79-29-8]  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 2,3-dimethylbutane (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. For convenience, further discussion of this system will be divided into two parts.

1. THE SOLUBILITY OF 2,3-DIMETHYLBUTANE (1) IN WATER (2)

The solubility data for 2,3-dimethylbutane in water (ref 2,3) are listed in Table 2 and plotted in Figure 1 The datum of Krzyzanowska and Szeliga (ref 4) has been excluded from this Evaluation as it does not appear to be independent of that of Price (ref 3).

At 298 K where comparison is possible, agreement between the reported values is only fair. At other temperatures only the values of Price (ref 3) are available. Thus all values are classified as Tentative. It should be noted firstly that the increase in solubility at lower temperatures reported by Polak and Lu (ref 2) is larger than is usually observed in hydrocarbon –water systems (e.g. benzene in water), and secondly the values of Price (ref 3) are usually reliable over the entire temperature range studied.

2. THE SOLUBILITY OF WATER (2) IN 2,3-DIMETHYLBUTANE (1)

The reported solubility data for water in 2,3-dimethylbutane (ref 1,2) are listed in Table 3. There are insufficient data to warrant plotting.

Agreement between the values at 273 K is excellent but at 298 K the datum of Englin et al. (ref 1) is about 50% (relative) higher than that of Polak and Lu (ref 2). In well characterized systems (e.g. water in benzene) the data of Englin et al. are generally satisfactory at T < 300 K but are markedly higher than "Recommended" values at higher temperatures. The value of Polak and Lu (ref 2) is therefore preferred at 298 K and at higher temperatures the data of Englin et al. should be regarded only as order of magnitude values.

Experimental Data:   (Notes on the Nomenclature)

Table 1. Quantitative Solubility Studies of the 2, 3-Dimethylbutane (1) - Water (2) System
Author	T/K	Reference	Solubility	Method
Englin et al.	273-323	1	(2) in (1)	analytical
Polak and Lu	273, 298	2	mutual	GLC, Karl Fischer
Price	298-423	3	(1) in (2)	GLC
Krzyzanowska and Szeliga	298	4	(1) in (2)	GLC

Table 2. Tentative Values for the Solubility of 2, 3-Dimethylbutane (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
273	2	3	3.29 g(1)/100g sln	a	3	3.3 g(1)/100g sln	b	6	6.9	b
298	2, 3	3	2.25, 1.91 g(1)/100g sln	a	3	2.1 ± 0.2 g(1)/100g sln	b	6	4.4	b
303	3	3	1.9* g(1)/100g sln	a	3	1.9 g(1)/100g sln	b	6	4.0	b
313	3	3	1.9* g(1)/100g sln	a	3	1.9 g(1)/100g sln	b	6	4.0	b
323	3	3	2.1* 10³ g(1)/100g sln	a	3	21 g(1)/100g sln	b	6	4.4	b
343	3	3	2.8* g(1)/100g sln	a	3	2.8 g(1)/100g sln	b	6	5.9	b
363	3	3	3.5* g(1)/100g sln	a	3	3.5 g(1)/100g sln	b	6	7.3	b
383	3	3	4.6* g(1)/100g sln	a	3	4.6 g(1)/100g sln	b	6	9.6	b
403	3	3	7.5* g(1)/100g sln	a	3	7.5 g(1)/100g sln	b	6	16	b
423	3	3	18* g(1)/100g sln	a	3	18 g(1)/100g sln	b	6	38	b

Table 3. Recommended (R) and Tentative Values of the Solubility of Water (2) in 2, 3-Dimethylbutane (1)
T/K	Reference	Sol. Power	Solubility	Best Sol. Power	Best Solubility	Best Sol. Note	x₂ Power	x₂	x₂ Note
273	1, 2	3	2.9, 3.0 g(2)/100 g sln	3	3.0 (R) g(2)/100 g sln	-	4	1.43 (R)	-
283	1	3	5.8 g(2)/100 g sln	3	5.8 g(2)/100 g sln	-	4	2.8	-
293	1	3	11.0 g(2)/100 g sln	3	11 g(2)/100 g sln	-	4	5	-
298	1, 2	3	15^a, 9 g(2)/100 g sln	3	9 g(2)/100 g sln	-	4	4	-
303	1	3	19.2 g(2)/100 g sln	3	20 g(2)/100 g sln	b	4	10	b
313	1	3	32.3 g(2)/100 g sln	3	30 g(2)/100 g sln	b	4	14	b
323	1	3	51.6 g(2)/100 g sln	3	50 g(2)/100 g sln	b	4	24	b

View Figure 1 for this Evaluation

Notes:
Table 2^a  Values marked with an asterisk ( * ) have been obtained by the Evaluator by graphical interpolation of the original measurements.
Table 2^b  Obtained by averaging where appropriate, σ_n has no statistical significance.
Table 3^a  Graphically interpolated by the Evaluator; datum of Polak and Lu (ref 2) preferred, see text.
Table 3^b  Order-of-magnitude values only, see text.

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

   1  Englin, B.A.; Plate, A.F.; Tugolukov, V.M. Pryanishnikova, M.A., Khim. Tekhnol. Topl. Masel 1965, 10, 42-6.
   2  Polak, J.; Lu, B.C.Y., Can. J. Chem. 1973, 51, 4018-23.
   3  Price, L.C., Am. Assoc. Petrol. Geol. Bull. 1976, 60, 213-44.
   4  Krzyzanowska, T.; Szeliga, J., Nafta (Katowice) 1978, 12, 413-7.