METHOD FOR BLEACHING KRAFT PULP

PROBLEM TO BE SOLVED: To provide a method for bleaching kraft pulp with excellent resistance to discoloring by which the consumption ratio of hydrogen peroxide is improved and also the amount of hypo used in the next stage can be reduced. SOLUTION: This method for bleaching the kraft pulp is charact...

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Bibliographische Detailangaben
Hauptverfasser:	KON TOSHIO, ITO KOJI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for bleaching kraft pulp with excellent resistance to discoloring by which the consumption ratio of hydrogen peroxide is improved and also the amount of hypo used in the next stage can be reduced. SOLUTION: This method for bleaching the kraft pulp is characterized by carrying out the bleaching at the final pH >=11 in a hydrogen peroxide bleaching stage subsequent to a chlorine bleaching stage in the method for bleaching the kraft pulp comprising bleaching a pulp obtained by cooking wood in many stages.