Pretreatment to Retrieve Xylose and Xylooligosaccharides by HCl Gas Directly from Biomass

A. Topias Kilpinen, Kaarlo Nieminen, Eero Kontturi*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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In this study, anhydrous hydrogen chloride gas was employed to selectively hydrolyze hemicellulose from aspen wood flour utilizing a gas-solid system. Selectivity toward hemicellulose was achieved by adjusting the acid concentration inside wood flour to 36% during gas hydrolysis, so only hemicellulose and disordered cellulose would be degraded during hydrolysis. Process parameters included the moisture content of the aspen wood flour (20%, 40%, and 60%) and reaction times from 30 min to 24 h. The optimal reaction conditions for the production of xylose and xylooligosaccharides was achieved with 40% moisture content and 6 h reaction time. Under these parameters, it was possible to retrieve 84% of the available xylan from aspen wood flour with only 1% glucan degradation.

Original languageEnglish
Pages (from-to)2135-2138
Number of pages4
JournalACS Sustainable Chemistry and Engineering
Issue number6
Publication statusPublished - 12 Feb 2024
MoE publication typeA1 Journal article-refereed


  • acid hydrolysis
  • biomass conversion
  • chain scission model
  • gas−solid reactions
  • selective hemicellulose saccharification


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