Process for the delignification of cellulose fiber raw materials

Details Process for the delignification of cellulose fiber raw materials Process for the delignification of cellulose fiber raw materials

1994-11-01

1995-11-28

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 19, 162 68, 162 76, 162 90, D21C 320, D21C 302

Patent

active

054704332

ABSTRACT:
A process for the delignification of cellulose fiber plant raw material for the production of pulp using separate impregnating and delignifying stages, each using alcohol and alkali. The process may be carried out in batch or in a continuous process. Less alcohol is used in the delignification stage than in the delignification stage. The pulp produced has very good properties because different amounts of alcohol are being used in the impregnation stage and in the delignification stage.

REFERENCES:
patent: 3585104 (1968-07-01), Kleinert
patent: 4100016 (1978-07-01), Diebold et al.
patent: 4496426 (1985-01-01), Baumeister et al.
Green, Jesse "Alkaline Pulping in Aq. Alcohols & Amines", TAPPI, May 1982, vol. 65, No. 5, pp. 133-137.
Ed McKenna, "Displacement Impregnation in a Continuous Digester", TAPPI, May 1977, vol. 60, No. 5, pp. 102-104.
April et al., "Prehydrolysis achieves higher organosolve delig."TAPPI, Feb. 1982, vol. 65, No. 2, pp. 41-44.
April, et al., "Delignification with Aqueous Organic Solvents", TAPPI, May 1979, vol. 62, No. 5, pp. 83-85.
Williamson, Peter, "Repap's Alcell.TM. Process: How it works & what it offers" Pulp & Paper Canada 88: 12 (87).

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