PERSULFATE BLEACHING OF SOFTWOOD KRAFT PULP - ITS AN EFFECTIVE SUPPLEMENT TO CHLORINE DIOXIDE

Based on the results of our micro-pilot study sodium persulphate could be produced efficiently and economically by conventional electrochemi cal means. The primary feedstock; could be either sodium sulphate or s odium sesquisulphate. Our laboratory investigations had also shown tha t sodium persulphate was effective in supplementing conventional ClO2 bleaching of kraft wood pulp. In such an application, transitional sho rtage of ClO2 could be bridged economically. This finding was confirme d in a mill trial.