ALKALINE PEROXIDE MECHANICAL WOOD PULPING PROCESS UTILISING A CHELATING AGENT PRETREATMENT FOR REMOVING METALLIC IONS

摘要

There is disclosed a high yield pulping process comprising impregnating chips with an alkaline peroxide solution containing stabilizers for peroxide followed by mechanical defibration, in which the wood chips are pretreated prior to peroxide impregnation, said pretreatment comprising; (a) impregnating the chips with an impregnation solution consisting essentially of a chelating agent for metallic ions; and, (b) expressing from the chips chelating agents and metallic ions. a