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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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1150 William R. Roy<br />

Table 17.1.1. The six groups <strong>of</strong> solvents discussed in this section<br />

Alcohols<br />

n-Butyl alcohol<br />

Isobutyl alcohol<br />

Methanol<br />

Benzene Derivatives<br />

Benzene<br />

Chlorobenzene<br />

o-Cresol<br />

o-Dichlorobenzene<br />

Ethylbenzene<br />

Nitrobenzene<br />

Toluene<br />

o-Xylene<br />

Chlorinated Aliphatic Hydrocarbons<br />

Carbon tetrachloride<br />

Dichloromethane<br />

Tetrachloroethylene<br />

1,1,1-Trichloroethane<br />

Trichloroethylene<br />

Chlorinated Fluorocarbons<br />

Trichlor<strong>of</strong>luoromethane (F-11),<br />

1,1,2,2-Tetrachloro-1,2-difluoroethane ( F-112)<br />

1,1,2-Trichloro-1,2,2-trifluoroethane (F-113)<br />

1,2,-Dichlorotetrafluoroethane (F-114)<br />

Ketones<br />

Acetone<br />

Cyclohexanone<br />

Methyl ethyl ketone<br />

Methy isobutyl ketone<br />

Others<br />

Carbon disulfide<br />

Diethyl ether<br />

Ethyl acetate<br />

Hexane<br />

Decane (a major component <strong>of</strong> mineral spirits)<br />

Pyridine<br />

Tetrahydr<strong>of</strong>uran<br />

17.1.2 WATER<br />

17.1.2.1 Solubility<br />

One <strong>of</strong> the most important properties <strong>of</strong> an organic solvent is its solubility in water. The<br />

greater a compound�s solubility, the more likely that a solvent or a solvent-containing waste<br />

will dissolve into water and become part <strong>of</strong> the hydrological cycle. Hence, water solubility<br />

can affect the extent <strong>of</strong> leaching <strong>of</strong> solvent wastes into groundwater, and the movement <strong>of</strong><br />

dissolved solvent into rivers and lakes. Aqueous solubility also determines the efficacy <strong>of</strong><br />

removal from the atmosphere through dissolution into precipitation. The solubility <strong>of</strong> solvents<br />

in water may be affected by temperature, salinity, dissolved organic matter, and the<br />

presence <strong>of</strong> other organic solvents.<br />

17.1.2.2 Volatilization<br />

<strong>Solvents</strong> dissolved in water may volatilize into the atmosphere or soil gases. A Henry�s Law<br />

constant (KH) can be used to classify the behavior <strong>of</strong> dissolved solvents. Henry�s Law describes<br />

the ratio <strong>of</strong> the partial pressure <strong>of</strong> the vapor phase <strong>of</strong> an ideal gas (Pi) to its mole fraction<br />

(Xi) in a dilute solution, viz.,<br />

K = P / X<br />

[17.1.1]<br />

H() i i i<br />

In the absence <strong>of</strong> measured data, a Henry�s Law constant for a given solvent may be estimated<br />

by dividing the vapor pressure <strong>of</strong> the solvent by its solubility in water (S i)atthe<br />

same temperature;<br />

K H(i) = P i (atm) /S i(mol/m 3 solvent) [17.1.2]<br />

AK Hvalue <strong>of</strong> less than 10 -4 atm-mol/m 3 suggests that volatilization would probably<br />

not be a significant fate mechanism for the dissolved solvent. The rate <strong>of</strong> volatilization is

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