METHOD OF BLEACHING PULP

摘要

2149332 9411568 PCTABS00032 The present invention relates to a method for bleaching pulp and especially to novel types of pro-environmental bleaching processes used in the wood-processing industry, in which methods the chlorine chemicals have been replaced by other bleaching chemicals involving discharges less harmful to the environment. It is a characteristic feature of the invention that bleaching comprises at least two peroxide stages between which stages the fibers are subjected to an activating treatment, for example, acidation or hot alkali extraction.