PULP BLEACHING PROCESS

PULP BLEACHING PROCESS

Bleaching of a lignocellulose-contg. matl. by the gas phase chlorination of a 20-40% (pref. 30%) pulp combined with displacement bleaching with ClO2 as an oxidation agent, is improved in that the spent liquor from the ClO2-stage is used as a displacing agent to dilute an unbleached or preliminarily...

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Bibliographische Detailangaben
1. Verfasser: GORAN ERIK ANNERGREN
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
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Zusammenfassung:Bleaching of a lignocellulose-contg. matl. by the gas phase chlorination of a 20-40% (pref. 30%) pulp combined with displacement bleaching with ClO2 as an oxidation agent, is improved in that the spent liquor from the ClO2-stage is used as a displacing agent to dilute an unbleached or preliminarily O2-bleached pulp, the pulp is concentrated before the gas phase chlorination to a solids content >=30% (pref. >=40%), and the gas phase chlorination is carried ut at an elevated temp. pref. for less than 2 mins. Spent solns. from the ClO2-stage is utilised, whereby the total consumption of water is considerably reduced and the heat economy is improved.