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Special Issue "Thermochemical Biorefining II"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A4: Bio-Energy".

Deadline for manuscript submissions: closed (31 January 2020) | Viewed by 3057

Special Issue Editor

Prof. Dr. Lasse Rosendahl
E-Mail Website1 Website2
Guest Editor
Department of Energy, Aalborg University, Pontoppidanstræde 111, 9220 Aalborg, Denmark
Interests: biofuels; thermochemical processes; hydrothermal liquefaction; catalytic upgrading; circular use of resources; sector-coupling technologies; green carbon pathways
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Special Issue Information

Dear Colleagues,

Thermochemical biorefining holds enormous potential for sustainable production of carbonaceous chemicals and fuels; sustainable in terms of economic, environmental and resource efficiency. Within this scope, virtually all organic streams, be they wet/dry, virgin/residual, aquatic/terrestrial, flora/fauna-derived can be processed alone or in mixtures to intermediate platform chemicals and precursors, intermediate fuel products, such as syngas or bio-oils and, from there, efficiently converted to synthetic hydrocarbons or higher alcohols. However, challenges in implementation, process understanding, design and upscaling, identifying and alleviating bottlenecks in process flows, exist within all, as do significant challenges in establishing and documentating sustainability in its full meaning.

The scope of this Special Issue is to present the state-of-the-art within sustainable thermochemical biorefining for fuels and chemicals, and to highlight opportunities within sustainable processing realisable by these pathways.

Prof. Lasse Rosendahl
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


  • Thermochemical biorefining
  • Hydrothermal liquefaction
  • Pyrolysis
  • Gasification
  • Fischer-Tropsch
  • Synthetic fuels
  • Circular economy
  • Bioeconomy
  • Sustainability
  • Life cycle analysis
  • Biofuels
  • Biochemicals
  • Direct thermochemical liquefaction
  • Drop-in biofuels

Published Papers (1 paper)

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Bio-Crude Production through Aqueous Phase Recycling of Hydrothermal Liquefaction of Sewage Sludge
Energies 2020, 13(2), 493; https://doi.org/10.3390/en13020493 - 19 Jan 2020
Cited by 39 | Viewed by 2751
Hydrothermal liquefaction (HTL) is a promising technology for the production of bio-crude. However, some unresolved issues still exist within HTL, which need to be resolved before its promotion on a commercial scale. The management of the aqueous phase is one of the leading [...] Read more.
Hydrothermal liquefaction (HTL) is a promising technology for the production of bio-crude. However, some unresolved issues still exist within HTL, which need to be resolved before its promotion on a commercial scale. The management of the aqueous phase is one of the leading challenges related to HTL. In this study, the sewage sludge has been liquefied at 350 °C with and without catalyst (K2CO3). Subsequently, aqueous phase recycling was applied to investigate the effect of recycling on bio-crude properties. Obtained results showed that the energy recovery in the form of bio-crude increased by 50% via aqueous phase recirculation, whereas nitrogen content in the bio-crude was approximately doubled after eight rounds of recycling. GCMS characterization of the aqueous phase indicated acetic acid as a major water-soluble compound, which employed as a catalyst (0.56 M), and resulted in a negligible increase in bio-crude yield. ICP-AES highlighted that the majority of the inorganics were transferred to the solid phase, while the higher accumulation of potassium and sodium was found in the aqueous phase via successive rounds of recycling. Full article
(This article belongs to the Special Issue Thermochemical Biorefining II)
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