IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Hexane with Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Hexane; C6H14; [110-54-3]  NIST Chemistry WebBook for detail

Original Measurements:
   Tsonopoulos, C.; Wilson, G.M., A. I. Ch. E. J. 1983, 29, 990-9.

Variables:
   Temperature = 311-473 K
   Pressure = 0.05-3.5 Mpa

Prepared By:
   G.T. Hefter

Experimental Remarks:

   The three phase critical point was reported to be 496.7 K, 5.295 Mpa and x₁ = 4.982 (0.239 g(1)/100 g sln, compiler).
The authors also report equations fitted to their own and literature data over the range 273-497 K, viz.

ln x₁ = -367.9847 + 16128.646/T + 52.820813 ln T

ln x₂ = -45.1714 - 1635.73/T + 7.53503 ln T

Experimental Data:   (Notes on the Nomenclature)

The solubility of hexane in water
T/K	Pressure [MPa]	10² * g₁/100 g solution (compiler)	10⁴ * Mole Fraction x₁
310.93	-^a	0.114	0.238
366.48	-^a	0.274	0.573
367.55	-^a	0.256	0.535
373.15	0.3482	0.297	0.621
422.04	-^a	1.30	2.71
423.15	1.2548	1.62	3.39
473.15	3.516	8.85	18.5

The solubility of water in hexane
T/K	Pressure [MPa]	g₂/100 g solution (compiler)	10² * Mole Fraction x₂
313.15	0.04537	0.025 (b)	0.117, 0.123
367.55	-^a	0.124	0.595
373.15	0.3482	0.148	0.709
423.15	1.2548	0.667	3.11
473.15	3.516	2.52	11.0

Notes:
   Table 1  ^a  Not specified.
   Table 1  ^b  Average value.

Method/Apparatus/Procedure:
   All experimental details are given in an Appendix deposited in a Documentation Centre rather than in the original paper. The solubility of (1) in (2) was measured by gas chromatography, whilst that of (2) in 91) was measured by Karl Fischer titration.

Source and Purity of Materials:
   (1) Not details given.
   (2) No details given.

Estimated Errors:
   Solubility: ± 5% relative; repeatability of replicate anlyses.
   Temperature: not stated.
   Pressure: ± 1%; type of error not stated.