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Birch wood pre-hydrolysis vs pulp post-hydrolysis for the production of xylan-based compounds and cellulose for viscose application
Aalto university, Finland ; VTT Technical Research Centre of Finland Ltd, Finland.
RISE - Research Institutes of Sweden, Bioekonomi, Bioraffinaderi och energi.
University of Helsinki, Finland.
Aalto university, Finland.
Visa övriga samt affilieringar
2018 (Engelska)Ingår i: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 190, s. 212-221Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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.

Ort, förlag, år, upplaga, sidor
2018. Vol. 190, s. 212-221
Nyckelord [en]
Cellulose, Dissolving pulp, Hydrothermal treatment, Viscose, Xylan
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
URN: urn:nbn:se:ri:diva-33536DOI: 10.1016/j.carbpol.2018.02.064Scopus ID: 2-s2.0-85042777891OAI: oai:DiVA.org:ri-33536DiVA, id: diva2:1194046
Tillgänglig från: 2018-03-28 Skapad: 2018-03-28 Senast uppdaterad: 2018-08-14Bibliografiskt granskad

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