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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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22<br />

Solvent Recycling, Removal,<br />

and Degradation<br />

22.1 ABSORPTIVE SOLVENT RECOVERY<br />

Klaus-Dirk Henning<br />

CarboTech Aktivkohlen GmbH, Essen, Germany<br />

22.1.1 INTRODUCTION<br />

A variety <strong>of</strong> waste gas cleaning processes 1-4 are commercially available. They are used to remove<br />

organic vapors (solvents) from air emissions from various industries and product<br />

lines. The main applications <strong>of</strong> solvents in various industries are given in Table 22.1.1.<br />

Table 22.1.1. Application <strong>of</strong> organic solvents. [After references 2-4]<br />

Application <strong>Solvents</strong><br />

Coating plants: Adhesive tapes, Magnetic<br />

tapes, Adhesive films, Photographic<br />

papers, Adhesive labels<br />

Chemical, pharmaceutical, food industries<br />

Fibre production<br />

Acetate fibers<br />

Viscose fibers<br />

Polyacrylonitrile<br />

Naphtha, toluene, alcohols, esters, ketones (cyclohexanone, methyl<br />

ethyl ketone), dimethylformamide, tetrahydr<strong>of</strong>uran, chlorinated hydrocarbons,<br />

xylene, dioxane<br />

Alcohols, aliphatic, aromatic and halogenated hydrocarbons, esters, ketones,<br />

ethers, glycol ether, dichloromethane<br />

Acetone, ethanol, esters<br />

carbon disulfide<br />

dimethylformamide<br />

Synthetic leather production Acetone, alcohols, ethyl ether<br />

Film manufacture Alcohols, acetone, ether, dichloromethane<br />

Painting shops: Cellophane, Plastic<br />

films, Metal foils, Vehicles, Hard papers,<br />

Cardboard, Pencils<br />

Cosmetics industry Alcohols, esters<br />

Rotogravure printing shops Toluene, xylene, heptane, hexane<br />

Textile printing Hydrocarbons<br />

Drycleaning shops Hydrocarbons, tetrachloroethane<br />

Amyl acetate, ethyl acetate, butyl acetate, dichloromethane, ketones (acetone,<br />

methyl ethyl ketone), butanol, ethanol, tetrahydr<strong>of</strong>uran, toluene,<br />

benzene, methyl acetate

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