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  • 1.
    Anheden, Marie
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy.
    Uhlin, Anders
    RISE - Research Institutes of Sweden, Bioeconomy.
    Wolf, Jens
    RISE - Research Institutes of Sweden, Bioeconomy.
    Hedberg, Martin
    RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
    Berg, Robert
    RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
    Ankner, Tobias
    RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
    Berglin, Niklas
    NiNa Innovation, Sweden; ÅF Industry, Sweden.
    von Schenck, Anna
    NiNa Innovation, Sweden; ÅF Industry, Sweden.
    Larsson, Anders L
    Valmet AB, Sweden.
    Guimaraes, Matheus
    Fibria, Sweden.
    Fiskerud, Maria
    Karlstad Airport, Sweden.
    Andersson, Stefan
    RISE - Research Institutes of Sweden, Bioeconomy.
    Value chain for production of bio-oil from kraft lignin for use as bio-jet fuel2017In: The 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017: NWBC 2017, Stockholm: RISE Bioekonomi , 2017, p. 104-109Conference paper (Refereed)
    Abstract [en]

    The LignoJet project aimed to achieve an intermediate lignin-oil product miscible with fossil feedstock and with a significantly reduced oxygen content. A technical concept for production has been studied that involves combined catalysed depolymerisation and hydrodeoxygenation, so called hydrogenolytic depolymerisation, of kraft lignin. Kraft lignin was separated through membrane ultrafiltration from softwood and eucalyptus black liquor followed by precipitation through LignoBoost technology. A difference in lignin properties was observed between ultrafiltration of softwood and eucalyptus black liquor through 15 and 150kDa ceramic membranes. Lignin-oils with similar oxygen content were produced regardless of origin and fractionation technique. A lignin-oil with favourable properties as precursor for refinery integration for jet fuel production as produced in small-scale batch experiments using nickel-based catalyst. Stable pumpable oils with melting point of less than 25-50 deg C and with 20-30% lower oxygen content and aromatic content were obtained that would be suitable as jet fuel precursors. The estimated production cost was found to be competitive with that of other liquid biofuels, while additional revenues could potentially be achieved by also producing chemical and materials from suitable fractions of the lignin-oil.

  • 2.
    Hosseinaei, Omid
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Åkerström, Mårten
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Uhlin, Anders
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Tomani, Per
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Danielsson, Sverker
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Melt spun lignin-based carbon fiber from softwood kraft lignin: effect of lignin pretreatment and fiber conversion conditions2018In: The 8th Nordic Wood Biorefinery Conference: NWBC 2018 : proceedings / [ed] Hytönen Eemeli, Vepsäläinen Jessica, Espoo: VTT , 2018, p. 157-163Conference paper (Other academic)
  • 3.
    Nowak, Andrzej P.
    et al.
    KTH Royal Institute of Technology, Sweden ; Gdansk university of technology, Poland.
    Hagberg, Johan
    KTH Royal Institute of Technology, Sweden.
    Leijonmarck, Simon
    RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB. KTH Royal Institute of Technology, Sweden.
    Schweinebarth, Hannah
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Baker, Darren A
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Uhlin, Anders
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Tomani, Per
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Lindbergh, Göran
    KTH Royal Institute of Technology, Sweden.
    Lignin-based carbon fibers for renewable and multifunctional lithium-ion battery electrodes2018In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 72, no 2, p. 81-90Article in journal (Refereed)
    Abstract [en]

    Lignin-based carbon fibers (LCFs) from the renewable resource softwood kraft lignin were synthesized via oxidative thermostabilization of pure melt-spun lignin and carbonization at different temperatures from 1000°C to 1700°C. The resulting LCFs were characterized by tensile testing, scanning electron microscopy (SEM), X-ray diffraction (XRD) and confocal Raman spectroscopy. The microstructure is mainly amorphous carbon with some nanocrystalline domains. The strength and stiffness are inversely proportional to the carbonization temperature, while the LCFs carbonized at 1000°C exhibit a strength of 628 MPa and a stiffness of 37 GPa. Furthermore, the application potential of LCFs was evaluated as negative electrodes in a lithium-ion battery (LIB) by electrochemical cycling at different current rates in a half-cell setup. The capacity drops with the carbonization temperature and the LCFs carbonized at 1000°C have a capacity of 335 mAh g-1. All LCFs showed good cycling stability. Because of the mechanical integrity and conductivity of the LCFs, there is no need to apply current collectors, conductive additives or binders. The advantage is an increased gravimetric energy density compared to graphite, which is the most common negative electrode material. LCFs show a promising multifunctional behavior, including good mechanical integrity, conductivity and an ability to intercalate lithium for LIBs.

  • 4.
    Salmen, Lennart
    et al.
    RISE, Innventia.
    Bergnor, Elisabeth
    RISE, Innventia.
    Olsson, Anne-Mari
    RISE, Innventia.
    Åkerström, Mårten
    RISE, Innventia.
    Uhlin, Anders
    RISE, Innventia.
    Extrusion of Softwood Kraft Lignins as Precursors for Carbon Fibres2015In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 10, no 4, article id 7544Article in journal (Refereed)
    Abstract [en]

    There is much interest in using less expensive raw materials as precursors for carbon fibre manufacture to increase the utilisation of strong, light-weight composite materials in the transportation sector. One such potential raw material is lignin. Most studies exploring melt spinning of lignin have used lignins from organosolv or hardwood kraft delignification processes. There has been little success reported in utilisation of the more commercially available softwood kraft lignins. In this study, lignins from different softwood kraft cooking processes were investigated with respect to their melt spinning performance and conversion to carbon fibres. The isolated lignins differed mainly in molecular weight, glass transition temperature, and softening temperature. All of the lignins produced from the laboratory cooks could be extruded without any plasticizer addition. However, the lignins contained volatiles that resulted in bubbles being formed along the length of the fibres. After vacuum drying, at elevated temperatures to remove volatiles, only the lignin originating from conventional kraft cooking was able to be melt extruded without plasticiser addition; this lignin had the lowest molecular weight amongst the samples. The stabilisation and carbonisation of these fibres gave carbon fibres with strengths comparable to those produced from lignins of other origins.

  • 5.
    Uhlin, Anders
    et al.
    RISE, Innventia.
    Danielsson, Sverker
    RISE, Innventia.
    Johansson, Therese
    Sivert, Åsa
    Membrane filtration of pulp mill effluents2014Conference paper (Refereed)
  • 6.
    Uhlin, Anders
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Åkerström, Mårten
    RISE - Research Institutes of Sweden, Bioeconomy.
    Schweinebarth, Hannah
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Baker, Darren A
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Danielsson, Sverker
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Tomani, Per
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Kraft lignin based carbon fibres2017In: The 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017: NWBC 2017, Stockholm: RISE Bioekonomi , 2017, p. 258-259Conference paper (Refereed)
    Abstract [en]

    Research has been carried out at RISE Bioeconomy into converting lignin to carbon fibres, focusing on melt spinning of kraft lignin to filaments, which were subsequently converted to carbon fibres. New equipment has been installed to improve the properties of the lignin based carbon fibres and now it is possible to produce carbon fibres with equal or even better properties compared with published data on lignin based carbon fibres. For a melt spun softwood kraft lignin that was converted to carbon fibres, the tensile strength had an average value of 952MPa, while the Young's modulus average value was 69GPa. A toy car demonstrator has been produced in a project financed by the Bioinnovation, a research programme by VINNOVA, Formas and the Swedish Energy Agency. The existing roof of the car was replaced with one consisting of a carbon fibre composite, in which the carbon fibres were made of 100% softwood kraft lignin. A lithium ion battery as also installed into the toy car, having a negative electrode containing lignin based carbon fibres

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