Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7782959 | Carbohydrate Polymers | 2018 | 26 Pages |
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 (â¼10â¯kDa) xylan for high-value applications.
Related Topics
Physical Sciences and Engineering
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Authors
Marc Borrega, Per Tomas Larsson, Patrik Ahvenainen, Sara Ceccherini, Thaddeus Maloney, Lauri Rautkari, Herbert Sixta,