Process for bleaching wood pulp and non-wood pulp, free flowing agglomerated bleach activating granule

摘要

"PROCESS FOR BLEACHING WOOD AND NON-WOOD PULP, GRINDING ACTIVATOR OF AGGLOMERATED BLEACHING OF FREE FLOW, AND, SOLUTION FOR BLEACHING OF WOOD AND NON WOOD PULP". Wood and non-wood pulp is bleached by: a) adding an aliquot of agglomerate from a medium for the distribution of a bulk solid, advantageously a silo, to a diluted solution of hydrogen peroxide which is desirably agitated to maintain the suspended agglomerate, the agglomerate comprising: a bleach activator, advantageously tetracetyl ethylene diamine, (TAED); a peroxide-soluble binder, preferably polyvinyl alcohol (PVOH); a dispersing system comprising a humidifying agent which is a low foaming substance and does not discolor on exposure to temperatures up to 120 198 C and optionally a salt, preferably sodium acetate, which is highly soluble in hydrogen peroxide; b) allow the TAED to react substantially completely with hydrogen peroxide; c) adjust the pH of the bleaching solution by adding alkali, preferably caustic soda; and d) bleaching the pulp by contacting it with the bleaching solution under alkaline conditions.