PROCESS FOR PRODUCING STERILE WATER CONTAINING HYPOCHLOROUS ACID OR CHLOROUS ACID AS ITS MAIN COMPONENT AND APPARATUS THEREFOR

摘要

Carbon dioxide gas is drawn out from carbon dioxide storing steel cylinder (15), decompressed by means of decompression valves (18,19) and fed into pressure vessel (13). A desirable-concentration aqueous solution of sodium hypochlorite is fed through raw material supply pipe (12) into the pressure vessel (13). The raw material supply pipe (12) is connected via distribution valve (102) to first branch pipe (100) and second branch pipe (101). The aqueous solution of sodium hypochlorite passing through the raw material supply pipe (12) is partly fed through the first branch pipe (100) and sprayed into a vapor phase region of the pressure vessel (13). The rest thereof is fed through the second branch pipe (101) into a liquid phase region of the pressure vessel (13). The pressure vessel (13) is provided with water level maintaining means (25-29) so that the water level is maintained within given range. The sterile water produced in the pressure vessel (13) is drawn out through discharge pipe (31) having aperture diaphragm (42). The pH value of the sterile water is detected by means of a pH sensor, and the distribution valve (102) is controlled so that the detected pH agrees with the desired pH.