Batch process for preparing kraft pulp in a batch digesting proc

Details Batch process for preparing kraft pulp in a batch digesting proc Batch process for preparing kraft pulp in a batch digesting proc

1992-12-28

1997-07-01

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 40, 162 47, 162 52, 162 59, 162 60, 162 61, D21C 900, D21C 904, D21C 712

Patent

active

056434103

ABSTRACT:
Methods for discharging spent cooking liquors from a batch digester containing cooked lignocellulose-containing material in spent cooking liquor are disclosed, including supplying a first portion of washing liquid to the digester to displace a first portion of the spent cooking liquor at a temperature and dry solids content which substantially corresponds to the temperature and dry solids content of the spent cooking liquor at the end of the batch digestion, supplying a second portion of washing liquid to the digester to displace a second portion of the spent cooking liquor having a temperature and dry solids content substantially lower than that of the spent cooking liquor in the digester, and maintaining the first and second portions of spent cooking liquor separate from each other. Methods of producing kraft pulp in batch digesting processes using this method are also disclosed.

REFERENCES:
patent: 1938957 (1933-11-01), Wells
patent: 2671727 (1954-03-01), Westcott et al.
patent: 4578149 (1986-03-01), Fagerlund
patent: 4849052 (1989-07-01), Grant
patent: 5015333 (1991-05-01), Grant
European Patent Office Communication, European Search Report, Oct. 15, 1992 .

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