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    Author(s): Nele S. Zwirchmayr; Ute Henniges; Markus Bacher; Takashi Hosoya; Heidemarie Reiter; Martin Spitzbart; Thomas Dietz; Klaus Eibinger; Wolfgang Kreiner; Arnulf Kai Mahler; Heribert Winter; Thomas Röder; Antje Potthast; Thomas Elder; Thomas Rosenau
    Date: 2018
    Source: Cellulose
    Publication Series: Scientific Journal (JRNL)
    Station: Southern Research Station
    PDF: Download Publication  (847.0 KB)

    Description

    The dihydroxyacetophenones 2,5-dihydroxyacetophenone (2,5-DHAP) and 2,6-dihydroxyacetophenone (2,6-DHAP) belong to the key chromophores in cellulosic materials. The pulp and paper industry targets these key chromophores in their bleaching sequences to obtain brighter products. 2,5- DHAP and 2,6-DHAP were degraded with hydrogen peroxide in alkaline media, similar to conditions of peroxide bleaching (P stage) in industrial pulp bleaching. Degradation product analyses were performed by GC–MS and NMR. The degradation reaction starts by loss of acetic acid originating from the acetyl moiety of the dihydroxyacetophenones (Baeyer–Villiger rearrangement). Further reaction steps involve introduction of another hydroxyl group at C-1 (previously acetyl bearing), and further oxidation of the resulting trihydroxybenzene to quinone intermediates which are ultimately degraded to a mixture of low-molecular weight carboxylic acids.

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    Citation

    Zwirchmayr, Nele S.; Henniges, Ute; Bacher, Markus; Hosoya, Takashi; Reiter, Heidemarie; Spitzbart, Martin; Dietz, Thomas; Eibinger, Klaus; Kreiner, Wolfgang; Mahler, Arnulf Kai; Winter, Heribert; Röder, Thomas; Potthast, Antje; Elder, Thomas; Rosenau, Thomas. 2018. Degradation of the cellulosic key chromophores 2,5- and 2,6-dihydroxyacetophenone by hydrogen peroxide under alkaline conditions. Chromophores in cellulosics, XVII. Cellulose. 25(7): 3815-3826. https://doi.org/10.1007/s10570-018-1817-0.

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    Keywords

    Cellulose, Chromophores, Yellowing, Brightness, Bleaching, Peroxide bleaching, Quinones, Dihydroxyacetophenones

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https://www.fs.usda.gov/treesearch/pubs/56934