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>