METHOD AND APPARATUS FOR BLEACHING HIGH CONSISTENCY PULP WITH A GASEOUS BLEACHING REAGENT

WIPO Patent Application WO1997005324

A3

A method and apparatus for bleaching high consistency pulp with a gaseous bleaching reagent. The pulp is shredded and then fluffed in the presence of a contacting gas which includes the gaseous bleaching reagent within an upstream vessel comprising a pin/foil contactor so as to suspend the pulp in the contacting gas and react the bleaching reagent with the pulp. The pulp is retained in the contactor for a predetermined time which is sufficient to consume about 75% to about 90% of a selected dose of the gaseous bleaching reagent which is required to delignify the high consistency pulp from an initial Kappa number to an intermediate Kappa number. The pulp and contacting gas are then separately supplied to a porous bed reactor where the reaction of the selected dose of the gaseous bleaching reagent with the pulp is substantially completed so as to further delignify the high consistency pulp from the intermediate Kappa number to a final Kappa number.

WO/2003/023134	LACCASE ACTIVITY ENHANCERS FOR PULP BLEACHING
WO2000068396	BACILLUS CIRCULANS XYLANASE MUTANTS

SHACKFORD LEWIS D (US)
CARLSMITH L ALLAN (US)

PCT/US1996/012903

June 19, 1997

July 16, 1996

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BELOIT TECHNOLOGIES INC (US)
SHACKFORD LEWIS D (US)
CARLSMITH L ALLAN (US)

D21C9/10; D21C9/14; D21C9/153; (IPC1-7): D21C/

WO1994015018A1	1994-07-07
WO1995008667A1	1995-03-30

EP0492040A1	1992-07-01
EP0515303A1	1992-11-25
FR2672314A1	1992-08-07

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