PURPOSE: 1,1,1-trichloroethane is decomposed efficiently by oxidative decomposing gas containing 1,1,1-trichloroethane out of ozone after being brought into contact with a solid acid catalyst and then absorbed and/or adsorbed.
CONSTITUTION: After being brought into contact with a solid acid catalyst such as alumina or the like, gas containing 1ppmW2% or so of 1,1,1- trichloroethane is oxidative decomposed with ozone. Then, the oxidative decomposed gas is brought into contact with alkali water solution or alkali solid bed and removed by absorbing products or adsorbing with an adsorbent such as activated carbon or the like. The suitable temperature of contacting the solid acid catalyst with gas containing 1,1,1-trichloroethane is 100W300°C. The suitable volume of ozone at the time of oxidative decomposition by ozone is 1/10W2mol to one (1)mol of 1,1,1-trichloroethane, and the suitable reaction temperature is 50W120°C.
OKUMA YASUTSUGU
FUKAI YASUSHI
SUZUKI AKIRA
