A processing apparatus comprising hermetically sealable processing chamber (28) having first through hole (49) communicating the inside and the outside to each other in which processing objects containing organohalogen compounds are introduced; heating means for heating at least part of the inside of the processing chamber; first pipe (51) capable of being taken out and put in through the first through hole with respect to the outside of the processing chamber, which first pipe when inserted in the first through hole, communicates with the first through hole and has a first passage wherein alkali (53) can be charged; first shield member (56) that when the first pipe is taken out from the first through hole, is capable of shielding the first through hole; and first evacuation means capable of evacuating the inside of the processing chamber through the first passage. By the use of this processing apparatus in pyrolytic processing of processing objects, the distance between the processing chamber and the alkali
