Alkaline steeping of dissolving pulp. Part II: Soluble compounds in the press lye

Danuta Joanna Mozdyniewicz, Gabriele Schild, Herbert Sixta*

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

This work describes the comprehensive characterization of the degradation products obtained after the alkaline steeping of dissolving pulp. Total chlorine free bleached beech sulfite pulp was treated with 18 % sodium hydroxide at different temperatures (40, 50 and 60 °C) for time periods of up to 80 h. After the removal of the insoluble cellulose, the remaining alkali solution was treated with sulfuric acid to precipitate the β-fraction. With extended treatment times and temperatures, the proportion of xylan in the β-fraction is increased. However, the molar mass distribution and the amount of 4-O-methylglucuronic acid in the β-fraction revealed no clear trend as a function of the treatment conditions. In total 13 hydroxy acids were identified in the acid soluble γ-fraction, of which glucoisosaccharinic, glycolic, lactic and xyloisosaccharininc acids were among the most abundant hydroxy acids representing the degradation products from C6- and C5-sugars.
Originalsprachedeutsch
Seiten (von - bis)2889-2900
FachzeitschriftCellulose
Jahrgang21
Ausgabenummer4
DOIs
PublikationsstatusVeröffentlicht - 2014

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

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