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  • 1.
    Aldaeus, Fredrik
    et al.
    RISE., Innventia.
    Schweinebarth, Hannah
    RISE., Innventia.
    Törngren, Per
    RISE., Innventia.
    Jacobs, Anna
    RISE., Innventia.
    Simplified determination of total lignin content in kraft lignin samples and black liquors2011Ingår i: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, nr 4, s. 601-604Artikel i tidskrift (Refereegranskat)
  • 2.
    Dedic, D.
    et al.
    RISE, Innventia.
    Sandberg, T.
    Iversen, T.
    RISE, Innventia.
    Larsson, T.
    RISE, Innventia.
    Ek, M.
    Analysis of lignin and extractives in the oak wood of the 17th century warship Vasa2014Ingår i: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 68, nr 4, s. 419-425Artikel i tidskrift (Refereegranskat)
  • 3.
    Granberg, Hjalmar
    et al.
    RISE., Innventia.
    Coppel, L.G.
    RISE., Innventia.
    Eita, M.
    De, Mayolo E.A.
    Arwin, H.
    Wågberg, L.
    Dynamics of moisture interaction with polyelectrolyte multilayers containing nanofibrillated cellulose2012Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, nr 2, s. 496-499Artikel i tidskrift (Refereegranskat)
  • 4. Li, Ying Zhen
    Study of fire and explosion hazards of alternative fuel vehicles in tunnels2018Rapport (Övrigt vetenskapligt)
    Abstract [en]

    An investigation of fire and explosion hazards of different types of alternativefuel vehicles in tunnels is presented. The different fuels are divided into four types:liquid fuels, liquefied fuels, compressed gases, and electricity, and detailed parameters are obtained. Three types offire hazards for the alternativefuel vehicles: pool fires, jet fires and fireballs are identified andinvestigated in detail. Fromthe perspective of pool fire size, the liquid fuels pose equivalent or evenmuch lower fire hazards compared to the traditionally used fuels, but theliquefied fuels may pose higher hazards. For pressurized tanks, the fires are generally much larger in size butshorter in duration. The gas releases from pressure relief devices and the resulting jet firesare highly transient. Forhydrogen vehicles, the fire sizes are significantly higher compared to CNGtanks, while flame lengths only slighter longer. Investigation of the peakoverpressure in case of an explosion in a tunnel was also carried out. Theresults showed that, for the vehicles investigated, the peak overpressure of tankrupture and BLEVE are mostly in a range of 0.1 to 0.36 bar at 50 m away. Thesituations in case of cloud explosion are mostly much more severe andintolerable. These hazards need to be carefully considered in both vehiclesafety design and tunnel fire safety design. Further researches on thesehazards are in urgent need.

  • 5.
    Li, Ying Zhen
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Ingason, Haukur
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Analysis of Muskö tunnel fire flows with automatic sprinkler activation2017Rapport (Övrigt vetenskapligt)
    Abstract [en]

    The focus of the present study is analyzing the best position of a sprinkler nozzle in a tunnel cross-section in the Muskö tunnel, south of Stockholm, Sweden. Activation of the sprinklers installed along the centerline and along the sidewall is investigated through analysis of full scale experiments and by three dimensional numerical modelling. Then the tunnel velocity is analyzed by one dimensional numerical modelling for various fire locations in the Muskö tunnel. For both activating the automatic sprinklers nearby the fire and avoiding activation of the sprinklers further downstream, the automatic sprinklers are recommended to be installed along the centerline of the tunnel. It has also been found that the tunnel velocity varies significantly with the fire location. When the fire is on the left side of the tunnel, the flow velocity mostly remains in a range of 1 m/s (positive or negative) within the first 10 minutes, which helps early activation of the automatic sprinklers. When the fire is on the right side of the tunnel, the flow velocity mostly remains within a range of -1 m/s and 1 m/s within the first 5 minutes, and the velocity mostly increases to 2 m/s at around 10 min. Therefore, the scenario for fire located on the left side is better than that for fire on the right side, especially when it is located between the middle of the right section and the right portal. As one typical case with fire on the right side, the tunnel velocity maintains at 1 m/s for the first 5 min and gradually increases to 2 m/s at 10 min. Under such conditions, the automatic sprinkler system is expected to perform well. 

  • 6.
    Li, Ying Zhen
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Ingason, Haukur
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    New models for calculating maximum gas temperatures in large tunnel fires2016Rapport (Övrigt vetenskapligt)
    Abstract [en]

    The work presented in this report focuses on estimating maximum gas temperatures at ceiling level during large tunnel fires. Gas temperature is an important parameter to consider when designing the fire resistance of a tunnel structure. Earlier work by the authors has established correlations between excess ceiling gas temperature and effective tunnel height, ventilation rate, and heat release rate. The maximum possible excess gas temperature was set as 1350°C, independent of the tunnel structure and local combustion conditions. As a result of this research, two models have been developed to better estimate possible excess maximum gas temperatures for large tunnel fires in tunnels with differing lining materials and structure types (e.g. rock, concrete). These have been validated using both model- and full-scale tests. Comparisons of predicted and measured temperatures show that both models correlate well with the test data. However, Model I is better and more optimal, due to the fact that it is more conservative and easier to use. The fire duration and flame volume are found to be related to gas temperature development. In reality, the models could also be used to estimate temperatures in a fully developed compartment fire.

  • 7.
    Palme, Anna
    et al.
    Chalmers University of Technology, Sweden.
    Peterson, Anna
    Chalmers University of Technology, Sweden.
    de la Motte, Hanna
    RISE - Research Institutes of Sweden, Bioekonomi, Bioraffinaderi och energi.
    Theliander, Hans
    Chalmers University of Technology, Sweden.
    Brelid, Harald
    Södra Innovation, Sweden..
    Development of an efficient route for combined recycling of PET and cotton from mixed fabrics2017Ingår i: Textiles and Clothing Sustainability, ISSN 2197-9936, Vol. 3, nr 4Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Most textile waste is either incinerated or landfilled today, yet, the material could instead be recycled through chemical recycling to new high-quality textiles. A first important step is separation since chemical recycling of textiles requires pure streams. The focus of this paper is on the separation of cotton and PET (poly(ethylene terephthalate), polyester) from mixed textiles, so called polycotton. Polycotton is one of the most common materials in service textiles used in sheets and towels at hospitals and hotels. A straightforward process using 5–15 wt% NaOH in water and temperature in the range between 70 and 90 °C for the hydrolysis of PET was evaluated on the lab-scale. In the process, the PET was degraded to terephthalic acid (TPA) and ethylene glycol (EG). Three product streams were generated from the process. First is the cotton; second, the TPA; and, third, the filtrate containing EG and the process chemicals. The end products and the extent of PET degradation were characterized using light microscopy, UV-spectroscopy, and ATR FT-IR spectroscopy, as well as solution and solid-state NMR spectroscopy. Furthermore, the cotton cellulose degradation was evaluated by analyzing the intrinsic viscosity of the cotton cellulose. The findings show that with the addition of a phase transfer catalyst (benzyltributylammonium chloride (BTBAC)), PET hydrolysis in 10% NaOH solution at 90 °C can be completed within 40 min. Analysis of the degraded PET with NMR spectroscopy showed that no contaminants remained in the recovered TPA, and that the filtrate mainly contained EG and BTBAC (when added). The yield of the cotton cellulose was high, up to 97%, depending on how long the samples were treated. The findings also showed that the separation can be performed without the phase transfer catalyst; however, this requires longer treatment times, which results in more cellulose degradation.

  • 8.
    Skagestad, Ragnhild
    et al.
    Tel-Tek, Norway.
    Normann, Fredrik
    Chalmers University of Technology, Sweden.
    Gardarsdottir, Stefania Osk
    Chalmers University of Technology, Sweden.
    Sundqvist, Maria
    RISE - Research Institutes of Sweden, Swerea, Swerea MEFOS AB.
    Anheden, Marie
    RISE - Research Institutes of Sweden, Bioekonomi. RISE., Innventia.
    Eldrup, Nils H.
    HSN, Norway.
    Ali, Hassan
    HSN, Norway.
    Haugen, Hans Aksel
    Tel-Tek, Norway.
    Mathisen, Anette
    Tel-Tek, Norway.
    CO2stCap - Cutting Cost of CO2 Capture in Process Industry2017Ingår i: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 114, s. 6303-6315Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper is a presentation of the CO2stCap project to be undertaken in the four year project period (2015 - 2019). The project focuses on partial CO2 capture in process industry and how this can be applied to reduce cost. By performing techno-economic analyses, the optimal capture rate, including optimal design, application and configuration for different industry sources can be obtained. Cost estimation methods are used as a basis to identify and verify potentials for cost reduction when applying different options for implementation of partial CO2 capture. CO2stCap. Industries studied in this project are pulp & paper, steel, cement and metallurgical production of silicon for solar cells.

  • 9.
    Tomani, P.
    et al.
    RISE, Innventia.
    Axegard, P.
    RISE, Innventia.
    Norberg, L.
    RISE, Innventia.
    Akerlund, L.-E.
    RISE, Innventia.
    Lignin removal from different black liquors2012Konferensbidrag (Refereegranskat)
  • 10.
    Wedin, Helena
    et al.
    RISE - Research Institutes of Sweden, Bioekonomi, Bioraffinaderi och energi.
    Niit, Ellinor
    Swedish School of Textiles, Sweden.
    Ahmad Mansoor, Zaheer
    re:newcell, Sweden.
    Kristinsdottir, Anna Runa
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    de la Motte, Hanna
    RISE - Research Institutes of Sweden, Bioekonomi, Bioraffinaderi och energi.
    Jönsson, Christina
    RISE - Research Institutes of Sweden, Material och produktion, IVF.
    Östlund, Åsa
    RISE - Research Institutes of Sweden, Bioekonomi, Bioraffinaderi och energi.
    Lindgren, Christofer
    re:newcell, Sweden.
    Investigation of recycled viscose fibres after removal of a reactive dye combination and an easy care finish agent2017Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Textile-to-textile recycling from cotton textiles can be done either mechanically or chemically. In chemical textile recycling of cotton there are challenges to overcome in order to regenerate new fibres. Two of the challenges among others are reactive dyes and wrinkle-free finishes that could disturb the regeneration process steps since these finishes are covalently linked to the cellulose.

    This poster discusses the impact of using a novel alkaline/acid bleaching sequence to strip reactive dyes and wrinkle-free finish (DMDHEU) from cotton textile for production of regenerated viscose fibre properties. The results might generate a promising step forward to overcome quality challenges for cellulosic chemical recycling.

  • 11. Winestrand, S.
    et al.
    Larsson, S.
    Cassland, P.
    Nilvebrant, N.-O.
    RISE, Innventia.
    Jonsson, L.J.
    Effects of ionic substances in bleaching filtrates and of lignosulfonates on the activity of oxalate oxidase from barley2011Ingår i: Engineering in Life Sciences, ISSN 1618-0240, E-ISSN 1618-2863, nr 3, s. 245-252Artikel i tidskrift (Refereegranskat)
  • 12.
    Ziesig, R.
    et al.
    RISE, Innventia.
    Tomani, P.
    RISE, Innventia.
    Theliander, H.
    Production of a pure lignin product part 2: Separation of lignin from membrane filtration permeates of black liquor2014Ingår i: Cellulose Chemistry and Technology, ISSN 0576-9787, Vol. 48, nr 9-10, s. 805-811Artikel i tidskrift (Refereegranskat)
  • 13.
    Öyaas, K.
    et al.
    RISE., Innventia, PFI – Paper and Fiber Research Institute.
    Toven, K.
    RISE., Innventia, PFI – Paper and Fiber Research Institute.
    Low temperature sulfonation of lignocellulose for effective biomass deconstruction and conversion2012Konferensbidrag (Refereegranskat)
  • 14. Öyaas, K.
    et al.
    Toven, K.
    Johnsen, I.A.
    Agnihotri, S.
    Moe, S.
    MacKenzie, A.
    Eijsink, V.
    The LignoRef Project:: A national research initiative to enhance biorefinery process developments in Norway2012Konferensbidrag (Refereegranskat)
1 - 14 av 14
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