TREATING METHOD FOR BLEACHED PULP THAT USES REDUCING BLEACHING AGENT

PROBLEM TO BE SOLVED: To provide a treating method for decreasing a reducing substance in pulp entrained water after bleaching with a reducing bleaching agent containing hydrosulfite or thiourea dioxide.SOLUTION: A treating method for bleached pulp comprises treating pulp entrained water obtained af...

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Bibliographische Detailangaben
Hauptverfasser:	KUWABARA HIDEKO, KOSHIZUKA TETSUO, YOSHIDA KIYOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR CHEMISTRY METALLURGY PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a treating method for decreasing a reducing substance in pulp entrained water after bleaching with a reducing bleaching agent containing hydrosulfite or thiourea dioxide.SOLUTION: A treating method for bleached pulp comprises treating pulp entrained water obtained after pulp is bleached with a reducing bleaching agent containing hydrosulfite or thiourea dioxide, with (A) 0.1-5 times equivalent of hydrogen peroxide relative to the amount of a reducing substance in the pulp entrained water and (B) metal and/or metal salt, so that the amount of the reducing substance in the pulp entrained water is set to be 0.20 meq/L or less.