Pre-extraction of hemicelluloses and subsequent ASA and ASAM pulping: Comparison of autohydrolysis and alkaline extraction

Waleed Wafa Al-Dajani; Ulrike W. Tschirner

doi:10.1515/hf.2010.064

Published by De Gruyter May 4, 2010

Pre-extraction of hemicelluloses and subsequent ASA and ASAM pulping: Comparison of autohydrolysis and alkaline extraction

Waleed Wafa Al-Dajani and Ulrike W. Tschirner

From the journal Holzforschung

https://doi.org/10.1515/hf.2010.064

Showing a limited preview of this publication:

Abstract

Commercial aspen wood chips were treated with hot water (autohydrolysis) and with alkali to extract part of the hemicelluloses. The extracted residues and an unextracted wood (control) were subjected to pulping based on the alkaline sulfite anthraquinone (ASA) and alkaline sulfite anthraquinone methanol (ASAM) methods to afford pulps useful for paper production with the same degree of delignification. Unlike the autohydrolysis residue, the alkali extracted residue was shown to favor subsequent pulping in terms of pulping yield, charges of chemicals, cooking times and properties of pulps. The experimental conditions and results are discussed.

Keywords: alkaline sulfite; alkaline sulfite anthraquinone (ASA); alkaline sulfite anthraquinone methanol (ASAM); aspen; biofuel; hemicelluloses; pulp; xylan

Corresponding author. Department of Bioproducts and Biosystems Engineering, University of Minnesota, Saint Paul, MN 55108, USA ulrike@umn.edu

Received: 2009-7-15

Accepted: 2010-2-17

Published Online: 2010-05-04

Published in Print: 2010-06-01

Pre-extraction of hemicelluloses and subsequent ASA and ASAM pulping: Comparison of autohydrolysis and alkaline extraction

Abstract

Journal and Issue

Articles in the same Issue