Production of Water-Soluble Carbohydrates from Aspen Wood Flour with Hydrogen Chloride Gas

A. Topias Kilpinen, Timo Pääkkönen, Kaarlo Nieminen, Eero Kontturi*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
32 Downloads (Pure)


The aim of this study was to optimize the reaction conditions for concentrated acid hydrolysis of aspen wood flour by employing anhydrous hydrogen chloride gas to produce fermentable sugars. Gas hydrolysis with HCl was conducted both with and without temperature control during hydrolysis under a relatively low pressure of 0.1 MPa. Process parameters for HCl gas hydrolysis included the moisture content of aspen wood flour (0.7-50%) and reaction time under pressure (30 min to 24 h). In addition, liquid-phase hydrolysis with concentrated hydrochloric acid was conducted in concentrations of 32-42% and 15 min to 24 h reaction times for comparison with the gas-phase process. The highest yields (>90%) for water-soluble carbohydrates from aspen wood flour were achieved with temperature-controlled gas hydrolysis using 50% moisture content and 2 h total reaction time, which is in line with the previous research and comparable to hydrolysis with concentrated (42%) hydrochloric acid.

Original languageEnglish
Pages (from-to)16922–16930
JournalIndustrial and Engineering Chemistry Research
Issue number41
Early online date4 Oct 2023
Publication statusPublished - 18 Oct 2023
MoE publication typeA1 Journal article-refereed


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