METHOD FOR DELIGNIFYING AND BLEACHING PULP

METHOD FOR DELIGNIFYING AND BLEACHING PULP

Process for the delignification and bleaching of pulp, comprising a first bleaching stage with hydrogen peroxide in the presence of a molybdate or tungstate in an acidic aqueous mixture; subsequent to the first bleaching stage, a second bleaching stage with hydrogen peroxide in an alkaline aqueous m...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: ILLHARDT, Verena, HOPF, Bernd, DIETZ, Thomas, GRIMMER, Ralf, WEGMANN, Sigrid
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
APPARATUS THEREFOR
PAPER-MAKING
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
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Beschreibung
Zusammenfassung:Process for the delignification and bleaching of pulp, comprising a first bleaching stage with hydrogen peroxide in the presence of a molybdate or tungstate in an acidic aqueous mixture; subsequent to the first bleaching stage, a second bleaching stage with hydrogen peroxide in an alkaline aqueous mixture; and, subsequent to the second bleaching stage, a third bleaching stage with hydrogen peroxide in the presence of a molybdate or tungstate in an acidic aqueous mixture.