Process for preparing kraft pulp using black liquor pretreatment

Details Process for preparing kraft pulp using black liquor pretreatment Process for preparing kraft pulp using black liquor pretreatment

1991-11-19

1993-02-02

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 37, 162 40, 162 41, D21C 106, D21C 1100

Patent

active

051835355

ABSTRACT:
Processes for prepariing kraft pulp are disclosed. The processes include pretreating cellulosic material or chips with spent cooking liquor at the temperature of about 20.degree. to 100.degree. C., followed by heating the impregnated chips at the temperature of from about 120.degree. to 180.degree. C., followed by digestion of the lignin with white liquor, which is facilitated by using this pretreatment process.

REFERENCES:
patent: 4236961 (1980-12-01), Green
patent: 4578149 (1986-03-01), Fagerlund
patent: 4764251 (1988-08-01), Ostman
patent: 4814942 (1989-03-01), MacLeod et al.
patent: 4849052 (1989-07-01), Grant

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