ANORDNING OCH FOERFARANDE FOER DELIGNIFIERING AV MASSA AV MEDELKONSISTENS MED HJAELP AV SYRE

Medium consistency oxygen delignification of pulp is carried out in a series of tubular reaction zones. Rapid delignification is achieved by agitating the pulp by rotating a timing screw in the first reaction zone at a speed in excess of 10 rpm, modifying the flights on the timing screw to increase...

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Bibliographic Details
Main Authors MARKHAM LARRY DERWOOD, EKLUND HENRIK JARL
Format Patent
LanguageFinnish
Published 12.08.1985
Edition4
Subjects
APPARATUS THEREFOR
BLASTING
HEATING
LIGHTING
MECHANICAL ENGINEERING
MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
NON-POSITIVE DISPLACEMENT PUMPS
PAPER-MAKING
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
REGENERATION OF PULPING LIQUORS
TEXTILES
TRANSPORTING
WEAPONS
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Summary:Medium consistency oxygen delignification of pulp is carried out in a series of tubular reaction zones. Rapid delignification is achieved by agitating the pulp by rotating a timing screw in the first reaction zone at a speed in excess of 10 rpm, modifying the flights on the timing screw to increase the amount of agitation, or a combination of the two. Primary oxygenation is carried out in the first reaction zone while subsequent zones provide the retention time needed for the delignification reaction to go to completion. A thick stock pump is used to introduce the pulp into the first reaction zone.
Bibliography:Application Number: FI19800003722