| abstract |
PROCESS FOR BLEACHING CELLULOSE WITHOUT CHLORINE, in particular cellulose for man-made fibers, for example deciduous tree pulp, with a starting cap of 15-1, preferably 4-1, or paper pulp, for example coniferous pulp, with a starting cap of up to 30 preferably up to 10 by means of ozone, according to which the cellulose suspension is brought into contact at a temperature of 15 to 80V ° C, preferably 40-70V ° C and at a pH of 1-8, preferably 2-3, with ozone-containing gas during strong mixing, wherein the gas contains 20-300 g / m3, preferably 50-150 g / m3 of ozone and wherein the amount of ozone is at most 2% by weight, preferably 0.05-0.5% by weight relative to absolutely dry cellulose , characterized in that ozone-containing gas at a pressure of 1-15 bar, preferably 1,1-% by weight, is introduced into the cellulose suspension with a density of 3-20% by weight, preferably 5-20% by weight, preferably 7-15% by weight. 10 bar. The application contains 3 more dependent requests. |