2026-04-16T02:45:08Zhttps://repository.lib.bcit.ca/oai/requestoai:repository.lib.bcit.ca:node-17672025-05-13T20:47:38Znode:32oai_pmh:all_repository_itemsEffect of alkaline pre-extraction of hemicelluloses and silica on kraft pulping of bamboo (Neosinocalamus affinis Keng)
Commercial bamboo chips were pre-treated with sodium hydroxide (NaOH) solutions to completely extract silica and partially extract hemicelluloses prior to kraft pulping. Reaction temperatures of 80â€"100 °C, times of 1â€"5 h, and NaOH charges of 6â€"18% were explored. With increasing pre-extraction severity, all silica and up to 50% of hemicelluloses in raw chips could be extracted without degrading cellulose and lignin. The chips from select extractions were cooked using the kraft process with varying effective alkali (EA) charges. Pre-extraction resulted in significant improvement in the delignification of chips during subsequent kraft pulping, offering an option to reduce the EA charge or the H-factor. The pulp yield was similar to the control while the drainage resistance of pulp from pre-extracted chips was slightly improved. Physical strength properties of pulps made from pre-extracted chips showed lower tensile index and higher tear index as compared with the control runs. Moreover, silica was no more a problem for chemical recovery and production of high-grade pulp. Extracted silica and hemicelluloses in the alkaline extraction liquor (AEL) can be used as a potential raw material for value-added products.,Peer reviewed,Published. Received 19 February 2016; Revised 13 June 2016; Accepted 19 June 2016; Available online 15 July 2016.
2016
ISSN: 1872-633X
https://doi.org/10.1016/j.indcrop.2016.06.019
English
Beatson, Rodger
Yuan, Zhaoyang
Chang, Xue Feng
Martinez, D. Mark
Kapu, Nuwan Sella
Elsevier Ltd.
Text
<p>© 2016 Elsevier B.V. All rights reserved.</p>