seen pale and delignifiera lignocellulosahaltiga lots with a gas mixture - ozone

摘要

A process for the delignification and bleaching of a lignocellulosic pulp slurry, having a consistency between about 1% and 10%, by weight of oven-dried pulp, and a pH between about 1 and 7, while at a temperature between about 0.degree.C. and 70.degree.C., with a gaseous mixture selected from the group consisting of ozone/oxygen, ozone/air, and mixtures thereof. The ozone containing gaseous mixture, which has an ozone concentration of from about 0.1% to about 20%, by weight of oxygen or air, is bubbled into the pulp slurry, while agitating the pulp-water-gas mixture at a rate of about 0.01 to 5.0 horsepower-days per ton of pulp.