Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1997-02-18
1998-10-20
Chin, Peter
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 17, 162 19, 162 29, D21C 700
Patent
active
058241876
ABSTRACT:
The present invention relates to a method for continuously producing pulp in which finely divided fiber material, preferably wood chips, is impregnated in an impregnation vessel (10), preferably by being fed in at the top (14) and fed out from the bottom (16) of the said vessel (10), in which cooking pressure essentially prevails in the said first vessel (10). The impregnation vessel, preferably, does not have a screen. The chips are heated and impregnated with the aid of black liquor that is concurrently flowing with a flow of the wood chips which have been thoroughly impregnated with boiling hot black liquor are transferred to the top (28) of a steam-phase digester (12). The pulp is permitted to flow passed at least one screen girdle (32) for drawing off spent liquor. The drawn off spent liquor has a high amount of effective alkali. The upper portion of the digester (12) has an effective alkaline level that is higher than the effective alkali level at the lower portion of the digester but the temperature in the lower portion of the digester is higher than the temperature in the upper portion thereof.
REFERENCES:
patent: 4123318 (1978-10-01), Sherman
patent: 5053108 (1991-10-01), Richter
patent: 5080755 (1992-01-01), Backlund
patent: 5089086 (1992-02-01), Silander
patent: 5192396 (1993-03-01), Backlund
patent: 5346591 (1994-09-01), Henricson
Richter Johan
Richter Ole
Chin Peter
Fasth Rolf
Kvaerner Pulping AB
Leavitt Steven B.
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