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Peroxide bleaching lignin reactions

Methods. A typical hydrogen peroxide bleaching operation consists of treatment of a 20% HPL solution in 60-75% aqueous ethanol with 25-50% hydrogen peroxide (by weight) on lignin derivative at 80°C. The reaction medium is adjusted to pH 2 by the addition of HC1, or to pH >12-13 by NaOH. Color loss is determined by UV/VIS absorbance measurements on suitably diluted samples. [Pg.439]

S. Hosoya, J. Nakano, Reactions of alpha-carbonyl group in lignin during alkahne hydrogen peroxide bleaching. Mokuzai Gakkaishi, 26 (2) 97-101, 1980. [Pg.549]

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See also in sourсe #XX -- [ Pg.155 , Pg.156 ]



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Bleaching lignin reactions

Bleaching reaction

Peroxidation reactions

Peroxide bleaches

Reaction peroxide

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