Journal
WOOD SCIENCE AND TECHNOLOGY
Volume 57, Issue 2, Pages 375-387Publisher
SPRINGER
DOI: 10.1007/s00226-022-01437-3
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In order to achieve a breakthrough in the application of cold caustic extraction, it is necessary to limit the amount of alkali and dissolve the hemicelluloses sufficiently. A NaOH/ZnO aqueous solution system was used to efficiently and selectively separate hemicelluloses from bleached bamboo pulp. The NaOH/ZnO process proved to be more successful in the removal of hemicelluloses, resulting in an increase in alpha-cellulose content and improved hemicelluloses removal efficiency and selectivity.
To achieve a breakthrough in the application of cold caustic extraction, it is necessary to limit the amount of alkali and to dissolve the hemicelluloses sufficiently. A NaOH/ZnO aqueous solution system was used to separate hemicelluloses from bleached bamboo pulp efficiently and selectively. The NaOH/ZnO process proved to be more successful in the removal of hemicelluloses. Under the conditions of 0.5% ZnO concentration, the NaOH/ZnO aqueous solution system decreased the hemicelluloses content to 4.99%, which was lower than 7.46% of the control sample treated with NaOH alone at the same 7% NaOH concentration. Correspondingly, the NaOH/ZnO system led to an increase in alpha-cellulose content with significantly improved hemicelluloses removal efficiency and selectivity. As a result of the NaOH/ZnO process, a higher degree of polymerization was observed, and the cellulose I structure was always maintained, which provided good benefits for the subsequent utilization of cellulose.
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