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    Hydrothermal liquefaction versus catalytic hydrodeoxygenation of a bioethanol production stillage residue to platform chemicals: A comparative study

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    Manuscript RUG-UIBv15082020hjh.pdf
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    Description:
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    Embargo End Date:
    2022-11-10
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    Type
    Article
    Authors
    Hita, I.
    Ghoreishi, S.
    Santos, J. I.
    Barth, T.
    Heeres, H. J.
    KAUST Department
    King Abdullah University of Science and Technology, KAUST Catalysis Center (KCC), Multiscale Reactor Engineering, Thuwal 23955-6900, Saudi Arabia
    Date
    2020-11-10
    Online Publication Date
    2020-11-10
    Print Publication Date
    2020-11
    Embargo End Date
    2022-11-10
    Submitted Date
    2020-08-20
    Permanent link to this record
    http://hdl.handle.net/10754/666028
    
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    Abstract
    Biobased chemicals like phenols and aromatics are preferably produced from cheap biomass waste streams. In this work, we have explored the potential of a eucalyptus-derived second generation bioethanol production stillage (BPS) residue for this purpose. A comparative study between a hydrothermal liquefaction (HTL) and a catalytic hydrodeoxygenation (HDO) step, as well as a 2-step HTL-HDO approach is reported, targeting at value-added low molecular weight platform chemicals (mainly alkylphenols and aromatics). HDO was observed to be a more suitable strategy than HTL for the production of organic oils enriched in valuable monomers. The direct HDO of the BPS using a commercial Ru/C catalyst at 450 °C and 100 bar H2 pressure led to an organic product oil (30.7 wt%) with a total monomer yield of 25.2 wt% (13.2 wt% of alkylphenolic+aromatics), compared to a 53.2 wt% of a product oil with 10.0 wt% monomers for the HTL step (305 °C). A 2-step HTL-HDO strategy was compared with the direct HDO approach. Comparable alkylphenolic+aromatic yields were obtained through this approach based on initial BPS intake (13.2 wt% vs 12.3 wt% for the direct HDO and HTL-HDO approach, respectively). Lower HTL temperatures (305 °C) for the first step are preferred to prevent over hydrogenation in the subsequent HDO step. As such, HTL appears a suitable pre-treatment for BPS and can (i) solve the issues related to the feeding of solids in pressurized continuous reactors for HDO and (ii) prevent coke formation during the HDO step, thus improving catalyst stability and durability.
    Citation
    Hita, I., Ghoreishi, S., Santos, J. I., Barth, T., & Heeres, H. J. (2020). Hydrothermal liquefaction versus catalytic hydrodeoxygenation of a bioethanol production stillage residue to platform chemicals: A comparative study. Fuel Processing Technology, 106654. doi:10.1016/j.fuproc.2020.106654
    Sponsors
    Dr. Idoia Hita is grateful for her postdoctoral grant awarded by the Department of Education, University and Research of the Basque Government (grant number POS_2015_1_0035). Leon Rohrbach, Jan Henk Marsman, Erwin Wilbers, Marcel de Vries, and Anne Appeldoorn are acknowledged for their technical and analytical support. Hans van der Velde is thanked for performing the elemental analysis.
    Publisher
    Elsevier BV
    Journal
    Fuel Processing Technology
    DOI
    10.1016/j.fuproc.2020.106654
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0378382020309450
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.fuproc.2020.106654
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