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5.10 CHAPTER FIVE

TABLE 5.1 Henry's Law Constants for Selected Compounds

Henry's
Compound Formula constant atm a,d
Vinyl chloride CH2CHCI 3.55 X l0 s
Oxygen 02 4.3 × 104
Toxaphene b CloH10C18 c 3.5 × 103
Carbon dioxide CO2 1.51 × 103
Carbon tetrachloride b CC14 1.29 × 103
Tetrachloroethylene b C2C14 1.1 X 103
Trichloroethylene b CHCICC12 5.5 × 102
Hydrogen sulfide H2S 5.15 × 102
Chloromethane b CH3C1 4.8 × 102
l,l,l-Trichloroethane b CCH3CI3 4.0 × 102
Toluene b C6H5CH3 3.4 × 102 (at 25 ° C)
Benzene b C6H6 2.4 × 102
Chloroform b CHCI3 1.7 × 102
Bromodichloromethane CHCI2Br 1.18 × 102e
1,2-Dichloroethane b CH2C1CHzC1 61
Dibromochloromethane CHC1Br2 47 f
Bromoform b CHBr3 35
Methyl tertiary butyl ether CsHI20 22 g
Ammonia NH3 0.76
Pentachlorophenal b C6(OH)CI5 0.12
Dieldrin b C 12H i oOC16 0.0094
aTemperature 20 ° C except where noted otherwise.
bComputed from water solubility data and partial pressure of pure liquid at specified temperature.
CSynthetic; approximate chemical formula.
dKavanaugh and Trussell, 1980, except where otherwise noted.
eWarner, Cohen, and Ireland, 1980.
fSymons et al., 1981.
gZorgorski et al., 1996.

The effective area a represents the total surface area created in the air stripping unit by
producing numerous fine water droplets or by forming minute gas bubbles. The effective
area is a function of air stripping equipment. In terms of effective area, an optimum treat-
ment system is one that includes a high surface area for mass transfer per unit volume.
The mass-transfer coefficient KL and the effective area for mass transfer a are usually
evaluated as one constant, KLa.

DESIGN OF AEFIA TION/AIFI STRIPPING PROCESSES

Air stripping equipment design has been developed extensively in the chemical industry
for handling concentrated organic solutions. Procedures found in the chemical engineer-