Patent ID: 6235963
Filing Date: 2001-05-22
Classification: A62D,B01D

Abstract:
A PCB decomposing method comprising the steps of:pressurizing PCB mixed with water to a pressure between 200 to 300 atmospheres and heating the mixture;then introducing the mixture into a primary reactor;introducing aqueous Na.sub.2 CO.sub.3 solution for PCB decomposition into said primary reactor forming deposited Na.sub.2 CO.sub.3 therein and blowing an oxidizing agent through a nozzle into the primary reactor to mix the deposited Na.sub.2 CO.sub.3 with the PCB;decomposing the PCB into biphenyl containing no chlorine and NaCl;causing the biphenyl to react with the oxidizing agent, thereby decomposing the biphenyl into carbon dioxide and water; andcausing a fluid containing unreacted PCB to flow into piping in a secondary reactor, so as to extend a residence time of the fluid in the secondary reactor for increasing a reaction time for decomposition of the PCB,wherein the unreacted PCB flowing from the primary reactor and the deposited sodium carbonate are separated from each other, and the separated sodium carbonate is returned to the primary reactor.