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 FOR ACTIVATING CELLULOSE PULP WITH NOAND/OR NO2 AND OXYGEN IN THE PRESENCE OF NITRIC ACIDAND THEN DELIGNIFYING BLEACHING THE ACTIVATEDCELLULOSE PULPABSTRACT OF THE DISCLOSUREA process is provided for activating cellulose pulp usingNO and/or NO2 plus oxygen gas in the presence of nitric acid, addedin an amount within the range from about 0.1 to about 1.0 gmoleper kg of water accompanying the cellulose pulp at a temperaturewithin the range from about 40 to about 120°C for a time at anactivating 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 delignifyingbleaching in an alkaline medium with or without oxygen gas and/orperoxide.