After-treatment of cellulose pulp

DTEXTILES PAPER D21Papermaking D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS APPARATUS THEREFOR

D21C9/00After-treatment of cellulose pulp

D21C9/001Modification of pulp properties D21C9/002by chemical means; preparation of dewatered pulp D21C9/004inorganic compounds D21C9/005organic compounds D21C9/007by mechanical or physical means D21C9/008Prevention of corrosion or formation of deposits on pulp-treating equipment D21C9/02Washing; Displacing cooking or pulp-treating liquors contained in the pulp by fluids D21C9/04in diffusers; Washing of pulp of fluid consistency without substantially thickening D21C9/06in filters; Washing of concentrated pulp D21C9/08Removal of fats, resins, pitch or waxes; Chemical or physical purification D21C9/083with inorganic compounds D21C9/086with organic compounds or compositions comprising organic compounds D21C9/10Bleaching; Apparatus therefor D21C9/1005Pretreatment of the pulp D21C9/101in solvent medium D21C9/1015with use of means other than pressure, temperature D21C9/1021Electrochemical processes D21C9/1026Other features in bleaching processes D21C9/1031Pulse, dynamic, displacement processes D21C9/1036Use of compounds accelerating or improving the efficiency of the processes D21C9/1042Use of chelating agents D21C9/1047Conserving the bleached pulp D21C9/1052Controlling the process D21C9/1057Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16 D21C9/1063with compounds not otherwise provided for D21C9/1068with O2 D21C9/1073with O3 D21C9/1078with Mn-containing compounds D21C9/1084with reducing compounds D21C9/1089with dithionites D21C9/1094with H2 D21C9/12with halogens or halogen-containing compounds D21C9/123with Cl2O D21C9/126with perhalogeno compounds D21C9/14with ClO2 or chlorites D21C9/142with ClO2/Cl2 in a multistage process involving ClO2/Cl2 exclusively D21C9/144with ClO2/Cl2 and other bleaching agents in a multistage process D21C9/147with oxygen or its allotropic modifications D21C9/153with ozone D21C9/16with per compounds D21C9/163with peroxides D21C9/166with peracids D21C9/18De-watering Elimination of cooking or pulp-treating liquors from the pulp D21C9/185comprising at least one step where the pulp is suspended in a gaseous medium