10.6084/m9.figshare.3080983 Naveen Kumar Chenna Naveen Kumar Chenna Pablo Piovano Pablo Piovano Christian Järnefelt Christian Järnefelt Tapani Vuorinen Tapani Vuorinen Organochlorine Formation in Tertiary Amine Catalyzed Pulp Bleaching Taylor & Francis Group 2016 AOX pulp bleaching chloroform hypochlorous acid OX tertiary amine 2016-03-01 22:04:29 Journal contribution https://tandf.figshare.com/articles/journal_contribution/Organochlorine_Formation_in_Tertiary_Amine_Catalyzed_Pulp_Bleaching/3080983 <p>An oxygen delignified eucalyptus kraft pulp was bleached by applying a catalytic amount of a tertiary amine, 1,4-diazabicyclo[2,2,2]octane, and hypochlorous acid at varying pH, temperature, and time. The bleaching filtrate was analyzed for chloroform and AOX and the pulp for residual lignin, hexenuronic acid, and OX. In comparison with chlorine dioxide bleaching, the novel catalytic bleaching (pH < 6) generated only traces of chloroform and low contents of AOX and OX. Separate catalytic oxidations of authentic hexenuronic acid showed that it was a major precursor of chloroform. The results demonstrate a practical way to reduce organochlorine formation in pulp bleaching and provide new understanding on the reaction pathways that yield chloroform.</p>