Alkaline Metal Dechlorination Description

This process of chemical dechlorination displaces chlorine from chlorinated organic compounds contained in oils and liquid wastes. Typically, wastes are filtered before entering the reactor system and encountering the dechlorinat-ing reagent. The great affinity of alkali metals for chlorine (or any halide) is the chemical basis of this process.

Successive treatment includes additional centrifugation and filtration. By-products include chloride salts, polymers, and heavy metals. Several chemical dechlorination processes are based on a method developed by the Goodyear Tire and Rubber Company in 1980. The original method uses sodium naphthalene and tetrahydrofuran to strip chlorine atoms from PCBs, polymerizing the biphenols into an inert condensible sludge. The reactor is blanketed with nitrogen because the reagents are sensitive to air and water, and an excess of reagent to chlorine is required. The Goodyear Company has not commercially developed this technology; however, several companies have modified the method by substituting their own proprietary reagents for the naphthalene. The equipment is mobile and can be transported on semi-trailers.

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