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Title: POM-assisted electrochemical delignification and bleaching of chemical pulp

Source: Cellulose chemistry and technology. Vol. 35, nos. 5-6 (2001): Pages 503-511.

Author(s)Laroche, Helene; Sain, Mohini; Houtman, Carl; Daneault, Claude

Publication Year: 2001  View PDF »

Category: Journal Articles

Abstract: A polyoxometalate-catalyzed electrochemical process has shown good selectivity in delignifying pulp. This breakthrough in redox catalysis shows promise for the development of a new environmentally benign technology for pulp bleaching. The electrochemical process, applied with a mildly alkaline electrolyte solution containing trace amounts of a vanadium-based polyoxometalate, K5[SiVW11O40], decreased the kappa number of a softwood Kraft pulp by about 40% without significant change in the viscosity of the pulp. In a similar electrochemical process, a softwood semi-bleached Kraft pulp was further bleached to a high brightness pulp, above 85% ISO, by electrolysing a borax-based electrolyte activated with tetraacetylethylenediamine in a pulp suspension.

Keywords: Wood pulp; viscosity; vanadium; electrochemistry; sulphate pulping process; polyoxometalates; bleaching; pulping; chemical reactions; catalysis; lignin; oxidation; hydrogen; ion exchange; tetraacetylenediamine; softwoods; pulp and paper processes; pulp; delignification; brightness; chemical pulp; electrochemistry

File size: 316 kb(s)

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RITS Product ID: 116
Current FPL Scientist associated with this product
Houtman, Carl J.
Chemical Engineer

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