| 摘要 |
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 DEG to about 120 DEG C. for a time at an activating temperature of 40 DEG to 50 DEG C. of from 15 to 180 minutes, at from 50 DEG to 90 DEG 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. |
