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The EU-funded HyFlexFuel research project has recently succeeded in producing biofuels via hydrothermal liquefaction (HTL) from a variety of biomasses, including sewage sludge, food waste, manure, wheat straw, corn straw, pine sawdust, miscanthus, and microalgae, in a pilot-scale continuous HTL plant at Aarhus University (Denmark). “It was a real milestone for HyFlexFuel to demonstrate biofuel production from such a variety of feedstocks at the hundred-kilogram scale,” says Patrick Biller, who leads pilot-scale HTL research at Aarhus University. Biocrudes from three representative feedstocks, spirulina (microalgae), sewage sludge, and wheat straw, were further refined into a mixture of hydrocarbon fuels at Aalborg University (Denmark). “Thanks to the expertise of several project partners, HyFlexFuel has proven that HTL biofuels can be successfully upgraded to drop-in fuels in an industrially relevant environment, achieving hundreds of hours of continuous operation,” adds Daniele Castello from Aalborg University. Analyses of the kerosene fractions of the upgraded biofuel show promising compositions for use as aviation fuel. “The production of HTL fuels from three different classes of feedstock demonstrates the flexibility of the process,” says project coordinator Valentin Batteiger of Bauhaus Luftfahrt (Germany). “Meeting jet fuel specifications is an appropriate target to validate that high-performance transportation fuels can indeed be produced from a wide range of residual and waste streams through hydrothermal liquefaction.”<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_3,1_3,1_3″ make_equal=”on” _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”1_3″ _builder_version=”4.16″ _module_preset=”default” custom_css_main_element=”margin: auto;” global_colors_info=”{}”][et_pb_image src=”https:\/\/www.arttic-innovation.de\/wp-content\/uploads\/hyflexfuel-biofuel-jetfuel.jpg” alt=”Sustainable aviation fuel components produced within the HiFlexFuel project” title_text=”HyFlexFuel biofuel jetfuel bio eco friendly” url=”https:\/\/www.ehden.eu\/” url_new_window=”on” _builder_version=”4.16″ _module_preset=”default” custom_css_main_element=”margin: auto;” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.16″ _module_preset=”default” custom_css_main_element=”margin: auto;” global_colors_info=”{}”][et_pb_image src=”https:\/\/www.arttic-innovation.de\/wp-content\/uploads\/hyflexfuel-research-team-at-aalborg-university.jpg” alt=”The research team at Aalborg University” title_text=”HyFlexFuel project biofuel jetfuel” url=”https:\/\/www.ohdsi.org\/” url_new_window=”on” _builder_version=”4.16″ _module_preset=”default” custom_css_main_element=”margin: auto;” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.16″ _module_preset=”default” custom_css_main_element=”margin: auto;” global_colors_info=”{}”][et_pb_image src=”https:\/\/www.arttic-innovation.de\/wp-content\/uploads\/hyflexfuel-research-plant.png” alt=”Research plant for catalytic hydrothermal gasification of organic compounds” title_text=”HyFlexFuel biofuel biomass bio jetfuel” url=”https:\/\/prostate-pioneer.eu\/” url_new_window=”on” _builder_version=”4.16″ _module_preset=”default” custom_css_main_element=”margin: auto;” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ custom_padding_last_edited=”on|phone” _builder_version=”4.16″ custom_margin=”-33px|||||” custom_padding=”33px||39px||false|” custom_padding_tablet=”” custom_padding_phone=”60px||60px||false|false” global_colors_info=”{}”][et_pb_row _builder_version=”4.16″ custom_padding=”0px||0px|||” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ global_colors_info=”{}”][et_pb_text _builder_version=”4.16″ text_font_size=”34px” header_font=”|300|||||||” header_text_color=”#012e45″ header_2_font=”Lato|700||||||#fff15f|solid” header_2_text_color=”#012e45″ header_2_font_size=”24px” header_2_letter_spacing=”1px” custom_margin=”||||false|false” custom_margin_tablet=”” custom_margin_phone=”|0px|||false|false” custom_margin_last_edited=”on|phone” custom_padding=”0px||||false|false” animation_style=”fade” border_color_all=”#3a7984″ border_width_bottom=”5px” border_color_bottom=”#bde10f” border_width_bottom_tablet=”” border_width_bottom_phone=”5px” border_width_bottom_last_edited=”on|desktop” global_colors_info=”{}”]<\/p>\n
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Decarbonization of the transportation sector will require large amounts of renewable fuels. So far, renewable diesel and jet fuels are mainly derived from vegetable oils, but the EU Renewable Energy Directive restricts the use of biofuels from food and feed crops because they do not meet sustainability requirements when produced on a large scale. Going forward, it will be important to commercialize advanced biofuel conversion technologies that utilize a broader and more sustainable feedstock base.<\/p>\n
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Hydrothermal liquefaction (HTL) is an emerging biofuel technology for producing transportation fuels from a variety of biowastes and other biomasses.<\/p>\n
HTL has several key advantages, the most important of which are:<\/p>\n
The pilot-scale HTL plant processes aqueous biomass slurries (~20% dry solids) at temperatures up to 350\u00b0C and pressures around 200 bar, where the water does not boil but remains in the liquid state. Under these conditions, the biomass is converted into a crude bio-oil, which is separated from the process water downstream of the reactor. In a second step, the HTL bio-oil is refined into transportation fuel products by catalytic treatment with hydrogen at high temperature and pressure (hydrotreating). This removes oxygen and nitrogen from the biocrude, which in turn is converted to a mixture of hydrocarbons. Distillation of the processed HTL biofats yields drop-in fuels in the gasoline, kerosene and diesel range.<\/p>\n
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As part of the EU HyFlexFuel project, all key steps along an HTL fuel production chain are being investigated at the premises of several European research institutions and companies. The potential availability of residual and waste streams across Europe is analyzed by the DBFZ, the German Institute for Biomass Research, using a geospatial approach. Aarhus University is further developing and optimizing HTL conversion on a laboratory scale and transferring the results to a pilot-scale continuous HTL plant, where all samples for downstream processes are also produced. Aalborg University, with the support of Haldor Tops\u00f8e (Denmark), realized the upgrading of various biofats to transportation fuels by catalytic hydrotreatment, while Eni (Italy) investigated the perspective of co-processing HTL biofats in conventional petroleum refineries.<\/p>\n
Solid particles and process waters, which are also generated during HTL conversion, contain a significant amount of the carbon and nutrients from the original biomass. Two options for producing biogas from the organic components of these process waters are being investigated by the Paul Scherrer Institute (Switzerland) using catalytic hydrothermal gasification on their Energy System Integration Platform and by OWS (Belgium) using anaerobic digestion. Phosphorus recovery is particularly important for HTL of sewage sludge to close nutrient cycles. The University of Hohenheim (Germany) has demonstrated the precipitation of struvite, a fertilizer product, from HTL solids and process waters. Bauhaus Luftfahrt is coordinating the project and analyzing the economic and environmental impact of HTL fuel production. ARTTIC Innovation GmbH (Germany) serves as project management partner and supports dissemination activities.<\/p>\n
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To date, seven alternative fuel production routes have been approved as blending components for commercial aviation by the ASTM D-7566 specification [1]. The HyFlexFuel consortium is preparing for the approval of HTL kerosene in collaboration with key partners in Europe and the US. Kerosene samples from the HyFlexFuel project were analyzed by the H2020 project JETSCREEN (coordinated by DLR, Germany) and the University of Dayton. The results show that all basic physicochemical properties of kerosene, such as energy density or cold flow properties, are already met, while the concentration of certain trace components needs to be further reduced to meet the stringent specifications for kerosene.<\/p>\n
[1]: Standard specification for jet fuel containing synthetic hydrocarbons.<\/p>\n
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HyFlexFuel is a four-year project (10\/2017 – 9\/2021) funded by the European Union’s Horizon 2020 research and innovation program. Leading European research organizations and companies in the field of HTL research are participating in HyFlexFuel, namely Aarhus University, Aalborg University, Paul Scherrer Institute, University of Hohenheim, DBFZ Deutsches Biomasseforschungszentrum gemeinn\u00fctzige GmbH, Haldor Tops\u00f8e, Eni and OWS. Bauhaus Luftfahrt e.V. coordinates the project and ARTTIC Innovation GmbH supports the research consortium with project management and communication.<\/p>\n
For more information, visit www.hyflexfuel.eu<\/a>.<\/p>\n