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Fractionation of liquid products from pyrolysis of lignocellulosic biomass by stepwise thermal treatment
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioeconomy, ETC Energy Technology Center.ORCID iD: 0000-0002-8264-4736
KTH Royal Institute of Technology, Sweden.
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2018 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 154, p. 346-351Article in journal (Refereed) Published
Abstract [en]

The thermal properties of cellulose, hemicellulose and lignin can be utilized to improve the characteristics of pyrolysis liquids. In this study, a concept of stepwise pyrolysis to fractionate the liquid based on the thermal properties of the biomass constituents was investigated. Lignocellulosic biomass was thermally treated in two steps: 200–300 °C followed by 550 °C. Derived liquids were studied for GC/MS analysis, water content, acid concentration and a solvent extraction method. Pyrolytic liquid derived from 550 °C after treatment at lower temperatures have a higher relative composition of phenolic compounds compared to one-step pyrolysis (increased from 58 to 90% of GC/MS peak area). Also, compounds known to promote aging, such as acids and carbonyl compounds, are derived at lower temperatures which may suppress aging in the liquid derived downstream at 550 °C. For liquids derived at 550 °C, the total acid number was reduced from 125 in one-step treatment to 14 in two-step treatment. Overall, no significant difference in the total liquid yield (sum of the liquids derived in separated treatments) nor any variations in their collective composition compared to one-step treatment at 550 °C was observed, i.e. stepwise pyrolysis can be utilized for direct fractionation of pyrolytic vapors.

Place, publisher, year, edition, pages
2018. Vol. 154, p. 346-351
Keywords [en]
Bio-oil, Biomass, Fractionation, Pyrolysis, Stepwise, Carbonyl compounds, Cellulose, Chemical analysis, Liquids, Solvent extraction, Thermodynamic properties, Acid concentrations, Bio oil, Biomass constituents, Lignocellulosic biomass, Phenolic compounds, Solvent extraction methods, Stepwise pyrolysis, concentration (composition), gas chromatography, mass spectrometry, phenolic compound, solvent
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34001DOI: 10.1016/j.energy.2018.04.150Scopus ID: 2-s2.0-85046167007OAI: oai:DiVA.org:ri-34001DiVA, id: diva2:1230509
Note

Funding details: 33284-2, Energimyndigheten; Funding details: 39449-1, Energimyndigheten; Funding text: The authors would like to thank Energimyndigheten ( Swedish Energy Agency ) for funding this project (projects no 33284-2 and 39449-1 ).

Available from: 2018-07-03 Created: 2018-07-03 Last updated: 2018-07-03Bibliographically approved

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