Process for activating cellulose pulp with no and/or...

Details Process for activating cellulose pulp with no and/or... Process for activating cellulose pulp with no and/or...

D - Textiles, Paper

21

C

9/16.5

D21C 3/16 (2006.01) D21C 9/10 (2006.01)

Patent

CA 1180509

A PROCESS FOR ACTIVATING CELLULOSE PULP WITH NO AND/OR NO2 AND OXYGEN IN THE PRESENCE OF NITRIC ACID AND THEN DELIGNIFYING BLEACHING THE ACTIVATED CELLULOSE PULP ABSTRACT OF THE DISCLOSURE A process is provided for activating cellulose pulp using NO and/or NO2 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 to about 120°C for a time at an activating temperature of 40 to 50°C of from is to 180 minutes, at from 50 to 90°C of from 5 to 120 minutes, and at higher tempera- tures of from 1 to 10 minutes, followed by washing, and delignifying bleaching in an alkaline medium with or without oxygen gas and/or peroxide.

399743

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