Chemical Engineering December 2011 - 45

Engineering Practice
compounds (compounds with more
than ten carbons, that is compounds
larger than C10) should be considered
rough values useful for initial analysis.
If initial analysis is favorable, follow-up
experimental determination
is recommended.
Estimation equation
The following equation was used to ascertain
values for the estimates:
(2)
Where:
S = solubility of the compound in water
at T = 298.15, 363.15 and 477.59K,
ppm (wt.)
TB = boiling point temperature of compound,
K
A = 3.780 for T = 298.15K,
= 4.590 for T = 363.15K and
= 5.625 for T = 477.59K
B = - 2.720  10-03
Solubility values obtained from
Equation (2) and experimental data
are shown in Figure 2 for the three
temperatures (298.15,
363.15, and
477.59K). The data in the figure are
based on the compilations of Englin
(and others) [4], Polak and Lu [9],
and Solubility Data Series [10-15] at
ambient temperature, and Chen and
Wagner [1-3] and Tsonopoulos (and
others) [18-20] at higher temperatures.
Boiling point temperatures are
from the compilations of Yaws [22-25].
General agreement of the equation
and data are displayed for the curves
at the three different temperatures.
An example calculation
In hydrocarbon processing, benzene
(C6H6) comes into contact with water
at 363.15K (90°C). The organic and
aqueous phases are subsequently separated.
Estimate the concentration of
water in benzene at this temperature.
Substitution of the coefficients from
Table 1 and the temperature into the
correlation equation yields:
log(S) = -14.7094 - 287.1471/363.15 +
7.4815 log(363.15)
= 3.6532
S = 103.6532
= 4,500.00 ppm (wt.)
■
Edited by Gerald Ondrey
References
1. Chen, H. and Wagner, J., An apparatus and
procedure for measuring mutual solubilities
of hydrocarbons + water: Benzene + water
from 303 to 373K, J. Chem. Eng. Data, 39, pp.
470-474, 1994.
2. Chen, H. and Wagner, J., An efficient and
reliable gas chromatographic method for
measuring liquid-liquid mutual solubilities
in alkylbenzene + water mixtures: Toluene +
water from 303 to 373K, J. Chem. Eng. Data,
39, pp. 475-479, 1994.
3. Chen, H. and Wagner, J., Mutual solubilities of
alkylbenzene + water systems at temperatures
from 303 to 373K: Ethylbenzene, p-Xylene,
1,3,5-trimethylbenzene, and butylbenzene, J.
Chem. Eng. Data, 39, pp. 679-684, 1994.
4. Englin, B. A., others, Solubility of water in individual
hydrocarbons, Khim. Tekhnol. Topl.
Massel, 9, 42, 1965.
5. Glasoe, P. K. and Schultz, S. D., J. Chem. Eng.
Data, 17, 66, 1972.
6. Jones, J. R. and Monk, C. B., J. Chem. Soc.,
2,633, 1963.
7. Marche, C., C. Ferronato, De Hemptinne, J.
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Chemical Engineering December 2011

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