FOERFARANDE FOER FRAMSTAELLNING AV OBLEKT SULFITCELLULOSA MED HOEG LJUSHET RENHET OCH STYRKA ELLER BLEKT CELLULOSA FRAON KVISTMASSA

FOERFARANDE FOER FRAMSTAELLNING AV OBLEKT SULFITCELLULOSA MED HOEG LJUSHET RENHET OCH STYRKA ELLER BLEKT CELLULOSA FRAON KVISTMASSA

Knots separated from sulphite cellulose produced by a sulphite cellulose cooking process are converted to unbleached sulphite cellulose by first separating and defibrating the sulphite knots and then treating the defibrated sulphite knots with oxygen under pressure in an alkaline milieu at an elevat...

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Bibliographische Detailangaben
1. Verfasser: HASVOLD KETIL
Format: Patent
Sprache:fin
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:Knots separated from sulphite cellulose produced by a sulphite cellulose cooking process are converted to unbleached sulphite cellulose by first separating and defibrating the sulphite knots and then treating the defibrated sulphite knots with oxygen under pressure in an alkaline milieu at an elevated temperature. The resultant cellulose may be bleached by itself, or mixed with sulphite cellulose produced from knot-free cellulose pulp for bleaching therewith.