Process for activating cellulose pulp with NO and/or NO.sub.2 an

Details Process for activating cellulose pulp with NO and/or NO.sub.2 an Process for activating cellulose pulp with NO and/or NO.sub.2 an

1982-03-24

1990-01-30

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 78, 162 81, D21C 316

Patent

active

048971561

ABSTRACT:
A process is provided for activating cellulose pulp using NO and/or NO.sub.2 plus oxygen gas in the presence of nitric acid, added in an amount within the range from about 0.1 to about 1.0 gmole per kg of water accompanying the cellulose pulp at a temperature within the range from about 40.degree. to about 120.degree. C. for a time at an activating temperature of 40.degree. to 50.degree. C. of from 15 to 180 minutes, at from 50.degree. to 90.degree. C. of from 5 to 120 minutes, and at higher temperatures of from 1 to 10 minutes, followed by washing, and delignifying bleaching in an alkaline medium with or without oxygen gas and/or peroxide.

REFERENCES:
patent: 4076579 (1978-02-01), Brink
Singh, "The Bleaching of Pulp, 3rd ed.", Tappi Press; Atlanta.

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