IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ethylbenzene with Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Ethylbenzene; C8H10; [100-41-4]  NIST Chemistry WebBook for detail

Original Measurements:
   Heidman, J.L.; Tsonopoulos, C.; Brady, C.J.; Wilson, G.M., A. I. Ch. E. J. 1985, 31, 376-84.

Variables:
   Temperature = 311 °C - 568 K
   Pressure = 0.01-10.7 MPa

Prepared By:
   G.T. Hefter

Experimental Remarks:

   The three phase critical point was reported to be 568.1 ± 0.6 K, 10.68 ± 0.04 MPa and x₁ = 5.83 × 10^-3 (3.34 g(1)/100 g sln, compiler). The authors also report an equation providing a fit of their own and literature data over the range 273-568 K, viz.

ln x₁ = -185.1695 + 7348.55/T + 26.34525 ln T ln x₂ = -0.37215 - 4.4626 (T_r^-1 - 1) - 0.38596 (1 - T_r)^1/3 - 2.59850 (1 - T_r)
where T_r = T / 568.1

Experimental Data: (Notes on the Nomenclature)

Solubility of ethylbenzene in water
T/K	Pressure [Mpa]	g₁/100 g solution (compiler)	10⁴ * Mole Fraction x₁
311.5	Not specified	0.019	0.32
367.6	0.111	0.051	0.86
423.4	0.627	0.129	2.19
479.5	2.32	0.35	6.0
536.1	6.50	1.88	32.5
552.8	8.59	2.17	37.5

Solubility of water in ethylbenzene
T/K	Pressure [Mpa]	g₂/100 g solution (compiler)	10² * Mole Fraction x₂
310.9	0.0091^a	0.073	0.43
367.6	0.111	0.320	1.86
423.4	0.627	1.06	5.96
479.5	2.32	3.20	16.3
536.1	6.50	10.5	40.8
550.4	8.27	13.2	47.2
568.1 (b)	10.68^b	27.5	69.1^b

Notes:
   Table 2  ^a  Estimated by the authors from pure component data.
   Table 2  ^b  Three phase critical point

Method/Apparatus/Procedure:
   Experimental procedure was similar to that used in ref. 1. Hydrocarbons were determined by gas chromatography and water by Karl Fischer titration. Critical points were determined by the synthetic method using visual observation. This aspect of the procedure is discussed in detail in the paper.

Source and Purity of Materials:
   (1) Aldrich 99+ mol %; water free purity greater or equal to 99.9 mol %, checked by gas chromatography.
   (2) Distilled; no details given.

Estimated Errors:
   Solubility: ± 5%, relative precision of replicate analyses.
   Temperature: not stated.
   Pressure: ± 1%; type of error not stated.

References:
   ¹Tsonopoulos, C.; Wilson, G.M., A. I. Ch. E. J. 1983, 29, 990-9.