Accession Number:

ADD013970

Title:

Chemical Detoxification of Polychlorinated Biphenyls (PCBs).

Descriptive Note:

Patent, Filed 4 Nov 85, Patented 14 Feb 89,

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1989-02-14

Pagination or Media Count:

3.0

Abstract:

The present invention relates to the chemical detoxification of polychlorinated biphenyls by converting them to non-hazardous substances. In particular, the invention relates to chemically destroying polychlorinated biphenyls on site for decontamination purposes without creating pollution or hazardous situations. The invention provides a two-step process where polychlorinated biphenyls PCBs, i.e. biphenyl having 2 to 10 chlorine atoms, are first reduced to unsubstituted biphenyl, then oxidized to a biodegradable dicarboxylic acid having the formula CH2n CO2H2, where n0 to 10 possible-CH2-units for application in aqueous systems including water, mud and wet soil. The process effectively destroys PCBs by chemical catalysts and each step is best performed at a temperature range of from 25 to 80 degrees Centigrade. Reduction of PCBs using a mild reducing agent that can be used in water alcohol systems, such as sodium borohydride in methanolwater, to yield biphenyl, followed by oxidation with potassium permanganate or hydrogen peroxide or nitric acid to yield benzoic acid or hexane-1,6-dicarboxylic acid, is a preferred method for detoxifying PCBs since both byproducts are biodegradable solids and relatively non-toxic compared to PCBs. Patents. AW

Subject Categories:

  • Organic Chemistry
  • Toxicology
  • Environmental Health and Safety

Distribution Statement:

APPROVED FOR PUBLIC RELEASE