Oxalic acid formation during ECF and TCF bleaching of kraft pulp
2000 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 83, no 2, 73-77 p.Article in journal (Refereed) Published
Formation of oxalic acid during bleaching of softwood kraft pulp was studied. The bleaching agents used were oxygen, hydrogen peroxide, chlorine dioxide, peracetic acid, and ozone. Formation of oxalic acid increased linearly with the reduction in kappa number. However, bleaching with peracetic acid produced less oxalic acid than the other bleaching agents. In ozone bleaching, about one-third of the oxalic acid formed is adsorbed on the pulp and not released until pulp pH is increased during a later stage, where it could combine with calcium ions to produce a calcium oxalate scale.
Place, publisher, year, edition, pages
2000. Vol. 83, no 2, 73-77 p.
IdentifiersURN: urn:nbn:se:kth:diva-19521ISI: 000085197200025OAI: oai:DiVA.org:kth-19521DiVA: diva2:338213
QC 201005252010-08-102010-08-10Bibliographically approved