Purification of cellulosic pulp by hot water extraction
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10570_2013_Article_86.pdf
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Author(s)
Sixta, Herbert
Borrega Sabate, Marc
Date Issued
October 2013
Journal
Cellulose
Publisher
Springer Netherlands
Citation
Borrega, Marc, and Herbert Sixta. “Purification of Cellulosic Pulp by Hot Water Extraction.” Cellulose 20.6 (2013): 2803–2812.
Version
Author's final manuscript
Abstract
Hot water extraction (HWE) of pulp in a flow-through reactor was evaluated as a method to purify paper-grade pulps. About 50–80 % of the xylan and up to 50 % of the lignin in unbleached birch Kraft pulp was extracted by the HWE without losses in cellulose yield. The residual xylan content in the extracted pulps was predominantly too high for dissolving-grade applications, but some of the pulps with a xylan content of 5–7 % might still be suitable as rayon-grade pulps. Increasing extraction temperature lowered the xylan content at which cellulose yield started to decrease. Furthermore, at any given xylan content, increasing extraction temperature resulted in cellulosic pulp with higher degree of polymerization. The extracted xylan was recovered almost quantitatively as xylo-oligosaccharides. The results suggest that HWEs at elevated temperatures may be applied to purify cellulosic pulps, preferably containing a low xylan content, and to recover the extracted sugars.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1007/s10570-013-0086-1
