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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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1154 William R. Roy<br />

17.1.4.2 Atmospheric residence time<br />

Vapor-phase solvents can dissolve into water vapor, and be subject to hydrolysis reactions<br />

and ultimately, precipitation (wet deposition), depending on the solubility <strong>of</strong> the given solvent.<br />

The solvents may also be adsorbed by particulate matter, and be subject to dry deposition.<br />

Lyman 16 asserted that atmospheric residence time cannot be directly measured; that it<br />

must be estimated using simple models <strong>of</strong> the atmosphere. Howard et al. 14 calculated ranges<br />

in half-lives for various organic compounds in the troposphere, and considered reaction<br />

rates with hydroxyl radicals, ozone, and by direct photolysis.<br />

17.1.5 THE 31 SOLVENTS IN WATER<br />

17.1.5.1 Solubility<br />

The solubility <strong>of</strong> the solvents in Table 17.1.1 ranges from those that are miscible with water<br />

to those with solubilities that are less than 0.1 mg/L (Table 17.1.2). Acetone, methanol,<br />

pyridine and tetrahydr<strong>of</strong>uran will readily mix with water in any proportion. The solvents<br />

that have an aqueous solubility <strong>of</strong> greater than 10,000 mg/L are considered relatively<br />

hydrophillic as well. Most <strong>of</strong> the benzene derivatives and chlorinated fluorocarbons are relatively<br />

hydrophobic. Hexane and decane are the least soluble <strong>of</strong> the 31 solvents in Table<br />

17.1.1. Most material safety data sheets for decane indicate that the n-alkane is “insoluble”<br />

and that the solubility <strong>of</strong> hexane is “negligible.” How the solubility <strong>of</strong> each solvent affects<br />

its fate in soil, water, and air is illustrated in the following sections.<br />

Table 17.1.2. The solubility <strong>of</strong> the solvents in water at 25 o C<br />

∞<br />

Solubility, mg/L Solvent (reference)<br />

Acetone (1)<br />

Methanol (1)<br />

Pyridine (1)<br />

Tetrahydr<strong>of</strong>uran (1)<br />

239,000 Methyl ethyl ketone (4)<br />

77,000<br />

76,000<br />

64,000<br />

60,050<br />

25,950<br />

23,000<br />

20,400<br />

13,000<br />

2,100<br />

1,900<br />

1,780<br />

1,495<br />

1,100<br />

1,080<br />

n-Butyl alcohol (4)<br />

Isobutyl alcohol (4)<br />

Ethyl acetate (4)<br />

Diethyl ether (4)<br />

o-Cresol (17)<br />

Cyclohexanone (4)<br />

Methyl isobutyl ketone (4)<br />

Dichloromethane (4)<br />

Carbon disulfide (4)<br />

Nitrobenzene (18)<br />

Benzene (19)<br />

1,1,1-Trichloroethane (4)<br />

Trichloroethylene (4)<br />

F-11 (4)<br />

Miscible<br />

Relatively hydrophillic

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