Process for activating cellulose pulp with NO and/or NO.sub.2 and oxygen in the presence of nitric acid and then delignifying bleaching the activated cellulose pulp

摘要

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