Polyoxometalate-catalyzed oxygen delignification of kraft pulp: A pilot-plant experience
authors Gaspar, AR; Evtuguin, DV; Neto, CP
nationality International
journal INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
keywords MODEL COMPOUNDS; DEGRADATION; POLYANION
abstract The results of the first pilot-scale kraft pulp oxygen bleaching catalyzed by polyoxometalate are presented. A modified heptamolybdopentavanadophosphate heteropolyanion (HPA) was used as the catalyst. Scale-up experiments clearly revealed the dependency of the pulp delignification rate on the mass- and heat-transfer phenomena showing a rate constant on the pilot equipment assay twice that on the laboratory reactor. The selectivity of the oxygen-catalyzed bleaching stage (O-HPA) was higher than that of the conventional oxygen alkaline bleaching (O). Pilot trials demonstrated similar consumption of chlorine dioxide and the strength properties of pulps bleached by OHPADED and ODED sequences. The chemical oxygen demand, absorbable organic halogens, and toxicity of the effluent streams were assessed for each bleaching stage. No catalyst retention on fully bleached pulp was detected. The practical aspects of the eventual industrial application of polyoxometalate-catalyzed oxygen bleaching are discussed.
publisher AMER CHEMICAL SOC
issn 0888-5885
year published 2004
volume 43
issue 24
beginning page 7754
ending page 7761
digital object identifier (doi) 10.1021/ie040061w
web of science category Engineering, Chemical
subject category Engineering
unique article identifier WOS:000225323800010
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journal analysis (jcr 2019):
journal impact factor 3.573
5 year journal impact factor 3.684
category normalized journal impact factor percentile 69.58
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