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Comparison of co-refining of fast pyrolysis oil from Salix via catalytic cracking and hydroprocessing
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.ORCID iD: 0000-0001-9126-0155
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.ORCID iD: 0000-0001-5147-7499
RISE Research Institutes of Sweden.
RISE Research Institutes of Sweden, Bioeconomy and Health, Biorefinery and Energy.ORCID iD: 0000-0002-6742-0646
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2023 (English)In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 172, article id 106753Article in journal (Refereed) Published
Abstract [en]

Lignocellulosic biomass from energy crops, i.e., short rotation coppice willows such as Salix spp., can be used as feedstock for production of transportation biofuels. Biomass conversion via fast pyrolysis followed by co-refining with fossil oil in existing refinery infrastructure could enable a fast introduction of large-scale production of biofuels. In this study, Salix was first liquefied using ablative fast pyrolysis in a pilot scale unit. The resulting pyrolysis oil, rich in oxygenates, was thereafter co-refined in 20 wt% ratio with fossil feedstock using two separate technologies, a fluidized catalytic cracking (FCC) laboratory unit and a continuous slurry hydroprocessing pilot plant. In the FCC route, the pyrolysis oil was cracked at 798 K using a commercial FCC catalyst at atmospheric pressure, while in the hydroprocessing route, the oil was processed at 693 K and a hydrogen pressure of 15 MPa in the presence of an unsupported molybdenum sulfide catalyst. Both routes resulted in significant deoxygenation (97 wt% versus 93 wt%). It is feasible to co-refine pyrolysis oil using both methods, the main difference being that the hydroprocessing results in a significantly higher biogenic carbon yield from the pyrolysis oil to liquid and gaseous hydrocarbon products (92 wt%) but would in turn require input of H2. In the cracking route, besides the liquid product, a significant part of the biogenic carbon ends up as gas and as coke on the catalyst. The choice of route depends, among other factors, on the available amount of bio-oil and refining infrastructures. © 2023 The Authors

Place, publisher, year, edition, pages
Elsevier Ltd , 2023. Vol. 172, article id 106753
Keywords [en]
Biofuels, Co-refining, Fast pyrolysis, Fluidized catalytic cracking, Hydroprocessing, Salix, Atmospheric pressure, Bioconversion, Carbon, Catalysts, Crops, Feedstocks, Fluidization, Fluidized beds, Molybdenum compounds, Pilot plants, Refining, Sulfur compounds, Biogenics, Fast pyrolysis oil, Fluidized catalytic crackings, Lignocellulosic biomass, Pyrolysis oil, ]+ catalyst, biofuel, catalyst, cracking (fracture), pyrolysis, refining industry
National Category
Renewable Bioenergy Research
Identifiers
URN: urn:nbn:se:ri:diva-64320DOI: 10.1016/j.biombioe.2023.106753Scopus ID: 2-s2.0-85150046232OAI: oai:DiVA.org:ri-64320DiVA, id: diva2:1755507
Note

 Correspondence Address: Johansson, A.-C.; RISE AB, Box 726, Piteå, Sweden; email: ann-christine.johansson@ri.se; Funding details: Svenska Forskningsrådet Formas, 2016-20031; Funding text 1: This study was supported by the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (Formas) under the grant number 2016-20031 . 

Available from: 2023-05-08 Created: 2023-05-08 Last updated: 2024-03-04Bibliographically approved

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Johansson, Ann-ChristineBergvall, NiklasWikberg, ElenaNiinipuu, MirvaSandström, Linda

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