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Gewählte Publikation:

Zwirchmayr, NS; Henniges, U; Bacher, M; Hosoya, T; Reiter, H; Spitzbart, M; Dietz, T; Eibinger, K; Kreiner, W; Mahler, AK; Winter, H; Roder, T; Potthast, A; Elder, T; Rosenau, T.
(2018): Degradation of the cellulosic key chromophores 2,5-and 2,6-dihydroxyacetophenone by hydrogen peroxide under alkaline conditions. Chromophores in cellulosics, XVII
CELLULOSE. 2018; 25(7): 3815-3826. FullText FullText_BOKU

Abstract:
The dihydroxyacetophenones 2,5-dihydroxyacetophenone (2,5-DHAP) and 2,6-dihydroxy-acetophenone (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. [GRAPHICS] .
Autor/innen der BOKU Wien:
Bacher Markus
Henniges Ute
Potthast Antje
Rosenau Thomas
Zwirchmayr Nele Sophie
BOKU Gendermonitor:


Find related publications in this database (Keywords)
Cellulose
Chromophores
Yellowing
Brightness
Bleaching
Peroxide bleaching
Quinones
Dihydroxyacetophenones


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