| 摘要 |
A process of treatment for harmful impurity-containing residue produced in the purification of industrial pentachlorophenol, which process is characterized in that said harmful impurities are all rendered harmless by carrying out the following steps: volatilizing the water and gases adsorbed on the active charcoal in said residue; heating the above treated residue so that most of the adsorbed materials in said residue are either carbonized or thermally decomposed whereas the rest volatilizes as such together with the thermal decomposition products to be deposited; and treating repeatedly the organic matter thus deposited in the next cycle of the purification in the same manner, or subjecting the matter remaining after heating treatment to decomposition combustion by heating; or heating said organic matter thus deposited in an aqueous solution of sodium hypochlorite so as to dissolve most of it, and treating the insoluble matter formed thereby in the next cycle of the purification in the same manner, or subjecting said insoluble matter to decomposition combustion by heating.
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