| Project/Area Number |
08455374
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
触媒・化学プロセス
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
MIURA Kouichi KYOTO UNIVERSITY,Graduate School of Engineering Professor, 工学研究科, 教授 (40111942)
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| 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)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| 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)
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| Keywords | Solubilization of brown coal at room temperature / Liquid phase oxidation / Structual analysis of brown coal / Flash pyrolysis of coal |
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| 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.
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