Birch wood pre-hydrolysis vs pulp post-hydrolysis for the production of xylan-based compounds and cellulose for viscose application

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http://hdl.handle.net/10138/299407

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Borrega , M , Larsson , P T , Ahvenainen , P , Ceccherini , S , Maloney , T , Rautkari , L & Sixta , H 2018 , ' Birch wood pre-hydrolysis vs pulp post-hydrolysis for the production of xylan-based compounds and cellulose for viscose application ' , Carbohydrate Polymers , vol. 190 , pp. 212-221 . https://doi.org/10.1016/j.carbpol.2018.02.064

Title: Birch wood pre-hydrolysis vs pulp post-hydrolysis for the production of xylan-based compounds and cellulose for viscose application
Author: Borrega, Marc; Larsson, Per Tomas; Ahvenainen, Patrik; Ceccherini, Sara; Maloney, Thaddeus; Rautkari, Lauri; Sixta, Herbert
Contributor: University of Helsinki, Department of Physics
Date: 2018-06-15
Language: eng
Number of pages: 10
Belongs to series: Carbohydrate Polymers
ISSN: 0144-8617
URI: http://hdl.handle.net/10138/299407
Abstract: Hydrothermal treatments of birch wood and kraft pulp were compared for their ability to extract the xylan and produce viscose-grade pulp. Water post-hydrolysis of kraft pulp produced a high-purity cellulosic pulp with lower viscosity but higher cellulose yield than traditional pre-hydrolysis kraft pulping of wood. Post-hydrolysis of pulp also increased the crystallite dimensions and degree of crystallinity in cellulose, and promoted a higher extent of fibril aggregation. The lower specific surface area in post-hydrolyzed pulps, derived from their larger fibril aggregates, decreased the accessibility of OH groups. However, this lower accessibility did not seem to decrease the pulp reactivity to derivatizing chemicals. In the aqueous side-stream, the xylose yield was similar in both pre- and post-hydrolysates, although conducting post-hydrolysis of pulp in a flow-through system enabled the recovery of high purity and molar mass (∼10 kDa) xylan for high-value applications.
Subject: Cellulose
Dissolving pulp
Hydrothermal treatment
Viscose
Xylan
CP/MAS C-13-NMR
NMR-SPECTROSCOPY
ACCESSIBILITY
REACTIVITY
KRAFT PULP
PURITY DISSOLVING PULP
FIBRIL AGGREGATION
HOT-WATER EXTRACTION
X-RAY
SPRUCE WOOD
116 Chemical sciences
114 Physical sciences
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