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) : Novinson, Thomas

Report Date : 14 Feb 1989

Pagination or Media Count : 3

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: (CH2)n (CO2H)2, where n=0 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 methanol/water, 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)

Descriptors :   *BIPHENYL, *DETOXIFICATION, *PATENTS, *CHLORINATED HYDROCARBONS, *POLLUTION ABATEMENT, *WASTE TREATMENT, *OXIDATION REDUCTION REACTIONS, ALCOHOLS, BENZOIC ACIDS, BIODETERIORATION, CARBINOLS, CARBOXYLIC ACIDS, CATALYSTS, CHEMICALS, CHLORINE COMPOUNDS, DECONTAMINATION, HAZARDS, HYDROGEN PEROXIDE, MOISTURE, MUD, NITRIC ACID, OXIDATION, PERMANGANATES, POTASSIUM COMPOUNDS, SODIUM BOROHYDRIDES, SOILS, SOLIDS, TEMPERATURE, WATER, WATER SUPPLIES, YIELD

Subject Categories : Organic Chemistry
      Toxicology
      Environmental Health and Safety

Distribution Statement : APPROVED FOR PUBLIC RELEASE