A1 Journal article (refereed), original research

Impact of pretreatment on hydrothermally carbonized spruce

Open Access publication

Publication Details
Authors: Partridge Anna, Sermyagina Ekaterina, Vakkilainen Esa
Publisher: MDPI
Publication year: 2020
Language: English
Related Journal or Series Information: Energies
Volume number: 13
Issue number: 11
ISSN: 1996-1073
JUFO-Level of this publication: 1
Open Access: Open Access publication


Upgrading biomass waste streams can improve economics in wood industries
by adding value to the process. This work considers use of a
hydrothermal carbonization (HTC) process for the residual feedstock
after lignin and hemicelluloses extraction. Batch experiments were
performed at 200–240 °C temperatures and three hours residence time with
an 8:1 biomass to water ratio for two feedstocks: Raw spruce and spruce
after lignin extraction. The proximate analysis and heating value
showed similar results for both feedstocks, indicating that the
thermochemical conversion is not impacted by the removal of lignin and
hemicelluloses; the pretreatment processing slightly increases the
heating value of the treated feedstock, but the HTC conversion process
produces a consistent upgrading trend for both the treated and untreated
feedstocks. The energy yield was 9.7 percentage points higher for the
treated wood on average across the range temperatures due to the higher
mass yield in the treated experiments. The energy densification ratio
and the mass yield were strongly correlated with reaction temperature,
while the energy yield was not. Lignocellulosic composition of the solid
HTC product is mainly affected by HTC treatment, the effect of lignin
extraction is negligible.

Research Areas

Last updated on 2020-11-06 at 12:50