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Two-step pyrolysis of biomass to enhance the chemical stability of pyrolytic liquids
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-9949-6274
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-1837-5439
2017 (English)In: European Biomass Conference and Exhibition Proceedings 2017, ETA-Florence Renewable Energies , 2017, Vol. 7, no 25thEUBCE, p. 1186-1189Conference paper, Published paper (Refereed)
Abstract [en]

Aging of pyrolytic liquid during storage changes its chemical and physical properties. The reason for aging is the chemical instability of the liquid, which is not at thermodynamic equilibrium when quenched after pyrolysis. Compounds active in these reactions mainly derivatives from hemicellulose (e.g. acids and carbonyls). In this work, a two-step pyrolysis concept was investigated to separate these compounds in a lower temperature treatment step upstream a conventional pyrolyzer. Different temperatures of the lower temperature treatment was investigated with constant conditions of the conventional treatment. The total liquid yield derived did not vary from pyrolysis in one step. Results show that the two-step pyrolysis process significantly reduces the concentration of organic acids and carbonyls in the liquid product from the second pyrolyzer, which instead are found in the liquid from the lower temperature treatment. Also, the concentration of sugar derivatives from the second step treatment is increased with the temperature of the first step. However, a complete separation of aging active compounds is not possible without sacrificing partial fractions of others (lignin derivatives were found in the low-temperature treatment). By varying the temperature of the first step one can control the concentrations and the liquid yield from each step.

Place, publisher, year, edition, pages
ETA-Florence Renewable Energies , 2017. Vol. 7, no 25thEUBCE, p. 1186-1189
Series
European Biomass Conference and Exhibition Proceedings, ISSN 2282-5819 ; 2017
Keywords [en]
Biomass, Chemical composition, Low temperature, Pyrolysis, Softwood, Torrefaction
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:kth:diva-224854Scopus ID: 2-s2.0-85043793450OAI: oai:DiVA.org:kth-224854DiVA, id: diva2:1193483
Conference
European Biomass Conference and Exhibition 2017
Note

QC 20180327

Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-03-27Bibliographically approved

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Persson, HenryEvangelopoulos, PanagiotisSvanberg, RikardWeihong, Yang

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