Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/14248
Title: ECF bleaching with a final hydrogen peroxide stage: Impact of the chemical composition of Eucalyptus globulus kraft pulps
Authors: Loureiro, Pedro E. G. 
Domingues, Eva F. 
Evtuguin, Dmitry V. 
Carvalho, M. Graça V. S. 
Keywords: Oxidation; Carboxyl groups; Carbonyl groups; Hexeneuronic acids; Intrinsic viscosity; Bleaching history
Issue Date: 2010
Publisher: College of Natural Resources
Citation: LOUREIRO, Pedro E. G. [et al.] - ECF bleaching with a final hydrogen peroxide stage: Impact of the chemical composition of Eucalyptus globulus kraft pulps. "BioResources". ISSN 1930-2126. 5:4 (2010) 2567-2580
Serial title, monograph or event: BioResources
Issue: 4
Abstract: Two industrial elemental chlorine free (ECF) bleaching sequences, D0(EOP)D1(EP)D2 and OQ(PO)DP, are compared with respect to the bulk content of lignin, carboxyl, hexeneuronic acids (HexA), and reducing groups after each bleaching stage. HexA groups contribute significantly to the total content of carboxyl groups, and their degradation during chlorine dioxide bleaching is reflected by a decrease of the carboxyl content. The higher degradation using an enhanced use of oxygenbased bleaching chemicals is associated with a higher fiber charge reduction, mainly due to xylan depletion. Additionally, the effect of process variables of a laboratory final hydrogen peroxide stage on the chemical composition of the fully bleached pulp (D0(EOP)D1P and OQ(PO)DP) is studied. The ability of final peroxide bleaching to raise the content of carboxyl groups is dependent on the operating conditions and pulp bleaching history. A balance between carbohydrate oxidation and dissolution of oxidized groups determines the effect on fiber charge. The effect of hydrogen peroxide stabilizers added into the final stage on the content of carboxyl groups is also reported.
URI: http://hdl.handle.net/10316/14248
ISSN: 1930-2126
Rights: openAccess
Appears in Collections:FCTUC Eng.Química - Artigos em Revistas Internacionais

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