PURPOSE: To reactivate catalytic properties, by a method wherein the gas passing surface of a catalyst layer is divided into plural sections to wash the same successively as well as waste water with low contamination degree is utilized as washing water of the next section to carry out economical washing.
CONSTITUTION: The gas passing surface of a catalyst layer 4 is divided into plural sections 4-a, 4-b, 4-c and a washing nozzle 5 is provided so as to be opposed to the gas passing surface as well as a washing liquid receiving tray 6 is provided at every sections below the catalyst layer 4. In this structure, fresh washing water 14 is sprayed toward the catalyst layer 4 from the upper part of said layer 4 through a valve 15-a, a washing nozzle 5-a to wash out and elute the alkali metal component contained in the catalyst composition. After this treatment, the receiving tray 6 receives waste water but waste water 7 containing contaminating substances at high concn. is discarded and a liquid after washing with low contamination degree is supplied to the next section to be succeedingly used in washing. As referred above, the catalyst composition is washed by water in an apparatus to reactivate catalitic properties by a small amount of water within a short time.
KUBO KIYOUJI
SETO TOORU
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