Delignification of Aspen Wood and Pine Kraft Pulp with Peroxymonophosphoric Acid, 1996 International Pulp Bleaching Conference Proceedings
Finely divided aspen wood and mixed northern pine kraft pulp were delignified with dilute aqueous solutions of peroxymonophosphoric acid at ambient temperature and pressure. For aspen wood, peroxymonophosphoric acid was much more selective in delignification than were peroxy-monosulfuric acid and pernitric acid. For pine pulp, peroxy-monophosphoric acid was more selective in delignification than were peroxymonosulfate, chlorine, or oxygen stabilized with magnesium. The results suggest that peroxymonophosphate treatment of alkaline-pretreated chips or fiberized wood could produce a highly delignified, bright pulp. Peroxymonophosphate might also be used as a pretreatment to oxygen delignification or as a delignification stage in bleaching.
Delignification of Aspen Wood and Pine Kraft Pulp with Peroxymonophosphoric Acid, 1996 International