Patent ID: 6599485
Filing Date: 2003-07-29
Classification: A62D,B01D

Abstract:
A PCB decomposing apparatus comprising:a PCB extracting container for extracting PCB from a PCB containing material with an organic solvent; a distilling tower for distilling an extracted solution introduced from the PCB extracting container, thereby separating the PCB from the organic solvent; a primary reactor including a container for receiving a PCB-containing fluid separated from the distilling tower, a nozzle for introducing aqueous sodium carbonate solution into the container for decomposing the PCB, and a nozzle for introducing an oxidizing agent; a secondary reactor having a bent conduit to increase a moving distance of the fluid and serving to further decompose unreacted PCB contained in the fluid introduced from the primary reactor in the conduit; a gas-liquid separator for separating, from the fluid, carbon dioxide contained in the fluid introduced from the secondary reactor; means for separating the unreacted PCB flowing out of the primary reactor and the deposited sodium carbonate, thereby returning the sodium carbonate to the primary reactor, said means for separating the unreacted PCB and the deposited sodium carbonate comprising a cyclone separator, the cyclone separator being caused to communicate with an oxidizing agent supply path in the primary reactor, thereby promoting separation in the cyclone separator and return of the separated sodium carbonate to the primary reactor by the flow of the oxidizing agent; pH detecting means for measuring pH of at least one of the primary reactor and the secondary reactor; sodium hydroxide supply means for supplying sodium hydroxide to the reactor including the pH detecting means; and control means for controlling an amount of sodium hydroxide to be supplied corresponding to a pH value detected by the pH detecting means.