Journal of the Japan Institute of Energy
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up
ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753

Journal of the Japan Institute of Energy Vol. 92 (2013), No. 4

  • Two-Step Decomposition Behavior of Rice Straw as Treated by Semi-Flow Hot-Compressed Water

    pp. 319-326

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.92.319

    Decomposition behavior of rice (Oryza sativa) straw, as one of the monocotyledonous angiosperms, was investigated under the two-step semi-flow hot-compressed water at 230°C/10 MPa/15 min (1st stage) and 270 °C/10 MPa/30 min (2nd stage). Prior to the hot-compressed water treatment, cold-water extraction at 20°C/10 MPa/30 min was performed. It was consequently found that some inorganic constituents and free neutral sugars such as xylose, arabinose, glucose and mannose, which would not be chemically bonded with the plant cell wall, were recovered in the cold-water extractives. On the other hand, in the 1st stage, hemicellulose, pectin and para-crystalline cellulose, whose crystalline structure is somewhat disordered, were selectively hydrolyzed, as well as lignin being partially decomposed. In addition, protein was found to be hydrolyzed and formed into various amino acids. Hydrolysis of crystalline cellulose was, however, observed in the 2nd stage. Some additional decomposition of lignin and protein was revealed at this stage as well. In total, 97.9% of oven-dried extractives-free rice straw sample could be solubilized into cold and hot-compressed water. Various products in the water-soluble portion were primarily recovered as saccharides (hydrolyzed products of the polysaccharides), which were partially isomerized and then dehydrated and fragmented. The 2.1% of residue after the treatment was composed mainly of lignin and a trace of silica.
    x

    Readers Who Read This Article Also Read

    1. Dependence of the Molecular Structural Parameters of Asphaltene on the Molecular Weight Journal of the Japan Institute of Energy Vol.93(2014), No.2
    2. Study on an HCCI Engine fueled by Biomass Gas (Effect of Inhomogeneity of Premixture) Journal of the Japan Institute of Energy Vol.93(2014), No.2
    3. Synthesis Gas Production via Non-catalytic and Catalytic Gasification of Lignin with High-moisture Content Journal of the Japan Institute of Energy Vol.93(2014), No.7
  • Adhesion of Fluidized Bed Particles on Biomass Char in Fluidized Bed Rapid Pyrolysis

    pp. 327-336

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.3775/jie.92.327

    Rapid pyrolysis experiments using a fluidized bed reactor, FBR, were carried out for various biomass species. Alumina particles used as bed particles adhered on the surface of the produced char. This phenomenon may cause serious operational problems of FBR such as agglomeration, clogging and so on. The effects of various conditions including heating rate and pyrolysis temperature, together with type of biomass were observed on the adhesion behavior of the bed particles. Among the samples of Japanese cypress, Eucalyptus camaldulensis, bagasse, and switchgrass, while all samples showed the phenomenon in case of rapid pyrolysis, no adhesion was observed in case of slow (10°C/min) pyrolysis, excepting that switchgrass showed the phenomenon at 400-1000°C (mainly 300-600°C). By rapid pyrolysis, softwood samples showed the adhesion phenomenon between 600 and 1200°C and hardwood, between 800 and 1000°C. Much more particles adhered on softwood char than on hardwood char. Among the herbaceous plant and agricultural residue samples, the adherability and temperature range strongly depended on the species. To investigate the effects of biomass type on the adhesion phenomenon, biomass model materials were pyrolyzed. Adhesion behavior was not observed for lignin only, however, it was observed with cellulose or hemicellulose and was also affected by their kind.
    x

    Readers Who Read This Article Also Read

    1. Dependence of the Molecular Structural Parameters of Asphaltene on the Molecular Weight Journal of the Japan Institute of Energy Vol.93(2014), No.2
    2. Study on an HCCI Engine fueled by Biomass Gas (Effect of Inhomogeneity of Premixture) Journal of the Japan Institute of Energy Vol.93(2014), No.2
    3. Synthesis Gas Production via Non-catalytic and Catalytic Gasification of Lignin with High-moisture Content Journal of the Japan Institute of Energy Vol.93(2014), No.7

Article Access Ranking

19 May. (Last 30 Days)

  1. Influence of Thermomechanical Treatment on Delayed Fracture Property of Mo-Bearing Medium-Carbon Steel ISIJ International Vol.62(2022), No.2
  2. Interaction Coefficients of Mo, B, Ni, Ti and Nb with Sn in Molten Fe–18mass%Cr Alloy ISIJ International Vol.62(2022), No.3
  3. Dissolution Kinetics of Synthetic FeCr2O4 in CaO–MgO–Al2O3–SiO2 Slag ISIJ International Vol.62(2022), No.4
  4. Fundamentals of Silico-Ferrite of Calcium and Aluminium (SFCA) and SFCA-I Iron Ore Sinter Bonding Phase Formation: Effects of MgO Source on Phase Formation during Heating ISIJ International Vol.62(2022), No.4
  5. Surface Quality Evaluation of Heavy and Medium Plate Using an Analytic Hierarchy Process Based on Defects Online Detection ISIJ International Advance Publication
  6. Exploration of the Relationship between the Electromagnetic Field and the Hydrodynamic Phenomenon in a Channel Type Induction Heating Tundish Using a Validated Model ISIJ International Vol.62(2022), No.4
  7. Comparison of Oxidation Behavior of Various Reactive Elements in Alloys during Electroslag Remelting (ESR) Process: An Overview ISIJ International Advance Publication
  8. Assessment of Blast Furnace Operational Constraints in the Presence of Hydrogen Injection ISIJ International Advance Publication
  9. Phenomenological Understanding about Melting Temperature of Multi-Component Oxides Tetsu-to-Hagané Vol.108(2022), No.4
  10. Influence of Stabilizing Elements on Ductile-Brittle Transition Temperature (DBTT) of 18Cr Ferritic Stainless Steels ISIJ International Vol.62(2022), No.4

Search Phrase Ranking

19 May. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. blast furnace permeability
  4. steel
  5. galvannealing
  6. jet impingement
  7. jet impingement + cooling + runout table
  8. nitrogen
  9. refractory
  10. valve spring steel