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Solubilization of brown coal oxidized in liquid phase and its effective conversion to liquid products

Research Project

Project/Area Number 08455374
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 触媒・化学プロセス
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

MIURA Kouichi  KYOTO UNIVERSITY,Graduate School of Engineering Professor, 工学研究科, 教授 (40111942)

Co-Investigator(Kenkyū-buntansha) MAE Kazuhiro  KYOTO UNIVERSITY,Graduate School of Engineering Assoc.Prof., 工学研究科, 助教授 (70192325)
NAKAGAWA Hiroyuki  KYOTO UNIVERSITY,Graduate School of Engineering Instructor, 工学研究科, 助手 (40263115)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥7,700,000 (Direct Cost: ¥7,700,000)
Fiscal Year 1997: ¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 1996: ¥4,800,000 (Direct Cost: ¥4,800,000)
KeywordsSolubilization of brown coal at room temperature / Liquid phase oxidation / Structual analysis of brown coal / Flash pyrolysis of coal
Research Abstract

A new method was developed for solubilizing a great deal of brown coal in conventionally used solvents at room temperaturc. The coal was pretreated with hydrogen peroxide in liquid phase at 60゚C for 2 h to break some weak covalent bonds and to introduce oxygen functional groups. When the pretreated coal was extracted by solvent mixtures of methanol and 1-methylnaphthalene of different mixing ratio at room temperature, 84wt% of the pretreated coal were extracted in the solvent consisting of 0.56 volumetric fraction of methanol. High extraction yield was also obtained when 2-methylnaphthalene or phenol was used instead of 1-methylnaphthalene.
Next we performed the flash pyrolysis of thus solubilized coal as a means to connert most of the coal into volatiles under mild conditions. An Australian brown coal was oxidized by H_2O_2 at 60゚C for 2 h, and the oxidized cola was solubilized in methanol based mixed solvent as mentioned above. Both the extract solubilized in the solvent (extract-solution) and the solid prepared by removing the solvent from the extract (extract-solid) were pyrolyzed in a free fall pyrolyzer at 923 to 1123K.When pyrolyzing the extract-solution, the total volatiles reached surprisingly up to 90 kg/100kg. On the other hand, the total volatiles were only 64kg/100kg when pyrolzing the extract-solid. To clarify the mechanism of the dramatic increase in the total volatiles for the extract-solution, the effect of the coal concentration, the solvent type and the degree of ocidation of coal on the pyrolysis yield was examined. The increase in the total volatiles was judged to be brought about by suppressing the cross-linking reaction of non-covalent bondings, through high dispersion of coal macromolecules in the solvent.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] K.Mae: "Flash Pyrolysis of Coal Modified through Liquid Phase Oxidation and Solvent Swelling" Energy & Fuels. 10. 364-370 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Mae: "Extraction of Low-Ran Coals Oxidized with Hydrogen Peroxide in Conventionally Used Solvents at Room Temperature" Energy & Fuels. 11. 825-831 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Mae: "Solubilization of an Australian Brown Coal Oxidized Hydrogen Peroxide in Conventionally Used Solvents at Room Temperature" Prepr.Am.Chem.Soc.Fuel Div. (SFC). 42(1). 176-180 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Mae: "Effect of Coal Structure on Thermal Degradation of Coal" Proc.9th International Conf.on Coal Science (Essen). I. 195-198 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Miura: "Flash Pyrolysis of Coal Solubilized in Methanol Based Binary Solvents" Proc.9th International Conf.or Coal Science (Essen). II. 585-588 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Mae: ""Flash Pyrolysis of Coal Modified through Liquid Phase Oxidation and Solvent Swelling"" Energy & Fuels. vol.10. 367-370 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Mae: ""Extraction of Low-Rank Coals Oxidized with Hyrdogen Peroxide in Conventionally Used Solvents at Room Temparture"" Energy & Fuels. vol.11. 825-831 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Mae: ""Solubilization of Austaralian Brown Coal Oxidized Hydrogen Peroxide in Conventionally Used Solvents at Room Temparature"" Prepr.Am.Chem.Soc.Fuel Diy.vol.42 No.1. 176-180 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Miura: ""Effect of Coal Structure on Thermal Degradation of Coal"" Proc.9th Int.Conf.on Coal Science. vol.I. 195-198 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Mae: ""Flash Pyrolysis of Coal Solubilized in Methanol Based Binary Solvents"" Proc.9th Int.Conf.on Coal Science. vol.II. 585-588 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Mae: "Solubilization of an Australian brown coal oxidized hydrogen peroxicle in conventionally used Solvents at room femperatave" Prepr.Am.Chem.Soc,Fuel Div. (SFC). 42(1). 176-180 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Mae: "Effect of coal stracture on thermal egradation of coal" Proc.9th International Conf.on Coal Science (Essen). 1. 195-198 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Miura: "Flash pyrolysis of coal Slubilized in methanol based birary solvents" Proc.9th International Conf.on Coal Science (Essen). 2. 585-588 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Kazuhiro Mae: "Extraction of Low Rank Cools Oxidized with Hydrogen Peroxide in Conventionally Used Solvent at Room Temperature" Energy & Fuels. (印刷中).

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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