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Identifying the primary reactions and products of fast pyrolysis of alkali lignin
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0003-3239-019x
University of Borås, Faculty of Textiles, Engineering and Business.
University of Borås, Faculty of Textiles, Engineering and Business.
Department of Bioproducts and Biosystems, Aalto University, School of Chemical Engineering, Vuorimiehentie 1, 02150, Espoo, Finland.
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2020 (English)In: Journal of Analytical and Applied Pyrolysis, Vol. 151, article id 104917Article in journal (Refereed) Published
Abstract [en]

This study focused on the effect of temperature and residence time on the primary thermal decomposition reactions during a fast pyrolysis of softwood alkali lignin. The use of Py-GC/MS/FID (Micropyrolyser-Gas Chromatography/Mass Spectrometry/Flame Ionization Detector) allowed for rapid heating of the sample and detailed identification and quantification of the pyrolysis products at a temperature range of 400–600 °C, with residence times from 0.5–5 s. The identified primary pyrolysis products were mainly volatile guaiacyl-type compounds. There was a general increase in yield for the majority of the volatile compounds with increased temperature and time. The cleavage of the lignin polymer to linear carbonyl (acetaldehyde) and guaiacyl-type aromatic compounds increased with temperature, while that of catechol and cresol type was mainly favoured at 500 and 600 °C. Based on these results, a mechanistic pathway for the pyrolytic process was proposed, drawing a linkage from structural units of lignin to the formed primary products. In summary, our findings suggest that the primary decomposition reactions that occur under the fast pyrolysis conditions can be controlled by varying the process temperature and residence time, and deliver mechanistic insight into the product distribution from structurally complex lignin material.

Place, publisher, year, edition, pages
2020. Vol. 151, article id 104917
Keywords [en]
Fast pyrolysis, Lignin, Primary reactions, Py-GC/MS/FID
National Category
Engineering and Technology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-23812DOI: 10.1016/j.jaap.2020.104917ISI: 000580632500014Scopus ID: 2-s2.0-85091261216OAI: oai:DiVA.org:hb-23812DiVA, id: diva2:1468467
Available from: 2020-09-18 Created: 2020-09-18 Last updated: 2023-08-31Bibliographically approved
In thesis
1. Fast pyrolysis of biomass: primary products and reaction pathways
Open this publication in new window or tab >>Fast pyrolysis of biomass: primary products and reaction pathways
2023 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Pyrolysis of biomass to produce liquid fuel and chemicals has been considered as an alternativeto fossil fuel because biomass has a lower environmental impact; moreover, it is renewable andcould be sustainable. However, the process of bio-oil production involves a series of complexchemical reactions which are dependent on the biomass feedstock and composition,temperature, heating rate as well as residence time. In this thesis, pyrolysis was carried out in amicro-pyrolyser connected to a gas chromatograph with a mass spectrometer/flame ionisationdetector to separate and identify the formed volatile compounds.

Firstly, the influence of temperature and residence time on the primary product yield andmechanistic pathways was investigated for the pyrolysis of cellulose, xylan and lignin attemperatures ranging between 400 – 600°C and residence times between 0.5 – 5 s. The resultshowed a general increase in the yield (count/μg sample) for most of the volatile compoundswith increasing temperature and residence time. Additionally, the interaction between theindividual biomass components was investigated. A comparison of the experimental andpredicted results showed that the product yields for some of the volatile compounds wereinhibited, especially for the cellulose-xylan-lignin blend and the native birch wood. This maybe due to the chemical interaction between the biomass and the presence of inorganic materials.The co-pyrolysis of palm kernel shell (PKS), mahogany (MAH) and iroko (IRO) sawdustshowed that the yield of the volatile compounds is dependent on the biomass composition andblend ratio. The co-pyrolysis of PKS, MAH and IRO in equal proportions showed an increasedrelative yield of the sugars compared to the other blend ratios investigated. Finally, the effectof dilute acid pretreatment on PKS, MAH and IRO sawdust prior to fast pyrolysis wasinvestigated. The removal of inorganic materials leads to increased yield, especially the sugarsand the furans. These results are important for understanding the formation mechanism of thepyrolysis products, selection of relevant operating conditions and the selection of a suitablemethodology that could enhance the pyrolysis product yield.

Place, publisher, year, edition, pages
Borås: Högskolan i Borås, 2023
Series
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 145
Keywords
Fast pyrolysis, Py-GC-MS/FID, Primary reactions, Cellulose, Xylan, Lignin, Birch wood, Co-pyrolysis, Mahogany, Iroko, Palm kernel shell, Biomass blend, Biomass interaction, Pretreatment
National Category
Energy Engineering
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-30339 (URN)978-91-89833-23-4 (ISBN)978-91-89833-24-1 (ISBN)
Public defence
2023-09-22, C203, Allégatan 1, Borås, 10:00 (English)
Opponent
Supervisors
Available from: 2023-08-31 Created: 2023-08-15 Last updated: 2023-09-18Bibliographically approved

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Supriyanto, SupriyantoUsino, DavidYlitervo, PäiviRichards, Tobias

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