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The formation of oxalic acid during bleaching of softwood kraft pulp was studied. Bleaching agents used were oxygen, hydrogen peroxide, chlorine dioxide, peracetic acid and ozone. The formation of oxalic acid was found to increase linearly with the reduction in kappa number. Peracetic acid bleaching gave less oxalic acid than the other bleaching agents. In ozone bleaching about one third of the formed oxalic acid is adsorbed on the pulp and not released until a later stage.
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Oxalic Acid Formation During ECF and TCF Bleaching of Kraft Pulp, 1997 Minimum Effluent Mills Sympos