Process for the manufacture of pulp using sodium carbonate and o

Details Process for the manufacture of pulp using sodium carbonate and o Process for the manufacture of pulp using sodium carbonate and o

1976-09-09

1977-08-30

Corbin, Arthur L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Chemical treatment after start or completion of mechanical...

162 31, 162 40, 162 65, 162 90, 210 38B, 210 42R, 210 63R, D21C 302

Patent

active

040452794

ABSTRACT:
A process for preparing pulp in a closed system by pre-cooking fibrous raw material in an alkaline aqueous solution of sodium carbonate or a mixture of sodium carbonate and sodium bicarbonate as the only alkaline ingredients at 90.degree.-190.degree. C, defibrating the pre-cooked material, pulping the defibrated material in an alkaline aqueous solution of sodium carbonate or a mixture of sodium carbonate and sodium bicarbonate as the only alkaline ingredients in a pressurized vessel at 90.degree.-170.degree. C in the presence of an oxygen-containing gas, subjecting waste liquor discharged from the pre-cooking and pulping steps to wet combustion to recover an alkaline aqueous substance and recycling the alkaline aqueous substance resulting from combustion to the pre-cooking and/or pulping steps.

REFERENCES:
patent: 2904460 (1959-09-01), Nolan
patent: 2913362 (1959-11-01), Cusi
patent: 3207572 (1965-09-01), Saul
patent: 3617563 (1971-11-01), Fuxelius
patent: 3691008 (1972-09-01), Worster et al.
patent: 3701712 (1972-10-01), Samuelson et al.
patent: 3790370 (1974-05-01), Lalancette
"Is Pulping Technology on Verge of Revolution?", Pulp & Paper, 7-1974, pp. 52-56.

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