Treatment of softwood kraft pulps with peroxymonosulfate before oxygen delignification, TAPPI JOURNAL, August 1993, Vol. 76(8)
This study examines peroxymonosulfate as an oxidative pretreament before oxygen delignification to allow greater lignin removal and thus reduce the chlorinated organic compounds emitted from the later bleaching stages. A preliminary treatment with a chelating agent or a mineral acid to remove transition metals was essential before the peroxymonosulfate pretreatment. The peroxymonosulfate pretreatment is as effective as the best of the previously studied pretreatments and is less polluting and more convenient to employ.