Process for pulping lignocellulosic material with a preoxidized

Details Process for pulping lignocellulosic material with a preoxidized Process for pulping lignocellulosic material with a preoxidized

1985-11-19

1988-08-16

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 65, 162 82, 162 83, D21C 302, D21C 320

Patent

active

047642521

ABSTRACT:
Lignocellulosic material is pulped by a process comprising the steps of: introducing a molecular oxygen-containing gas, such as air, into an alkaline sulfide solution containing NaOH, Na.sub.2 S and at least one cyclic organic compound selected from quinone, hydroquinone, 9,10-diketohydroanthracene and 9,10-dihydroxyhydroanthracene compounds, to oxidize at least a portion of Na.sub.2 S; delignifying the lignocellulosic material with an alkaline sulfide cooking liquor containing the oxidized alkaline sulfide solution at an elevated temperature and; then, recovering the resultant pulp from the delignification mixture.

REFERENCES:
patent: 1855353 (1932-04-01), Jacobson
patent: 4363700 (1982-12-01), Wada et al.

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