| Project/Area Number |
09555237
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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 | 展開研究 |
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| Research Field |
反応・分離工学
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| Research Institution | Osaka University |
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Principal Investigator |
KOMASAWA Isao Osaka Univ., Graduate School of Eng. Sci., Professor, 基礎工学研究科, 教授 (40029476)
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| Co-Investigator(Kenkyū-buntansha) |
NODA Hideo Kansai Chemical Engineering Co., Ltd., President, 取締役社長
SATO Hiroshi Osaka Univ., Graduate School of Eng. Sci., Res. Assoc., 基礎工学研究科, 助手 (60283743)
HIRAI Takayuki Osaka Univ., Graduate School of Eng. Sci., Assoc. Professor, 基礎工学研究科, 助教授 (80208800)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥11,800,000 (Direct Cost: ¥11,800,000)
Fiscal Year 1998: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1997: ¥10,300,000 (Direct Cost: ¥10,300,000)
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| Keywords | Light Oil / Deep Desulfurization / Photochemical Reaction / Liquid-Liquid Extraction / Organic Sulfur Compounds / Catalytic-Cracked Gasoline / Residue Oil / Demetallization / ジベンゾチオフェン / 電子移動増感反応 / 三重項増感反応 / 脱硫 / ジベンソチオフェン / 光増感剤 |
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| Research Abstract |
Deep desulfurization processes for light oil using photochemical reaction and liquid-liquid extraction, based on light oil/water two-phase system and light oil/organic polar solvent two-phase system, were investigated.
1. Deep desulfurization of light oils using light oil/water two-phase system. Photochemical reaction of dibenzothiophene (DBT), a typical refractory sulfur compound in light oil, is suppressed by naphthalene. Thus, a new process was developed, where DBT was photoexcited indirectly by using triplet photosensitizer (benzophenone), oxidized by hydrogen peroxide, and then removed into the water phase. This process was especially applicable for commercial light oils in which aromatic compounds were less contained, and 48-h photoirradiation (λ > 280 nm) brought about a desulfurization from 0.2 wt% sulfur content to 0.05 wt%. An overall desulfurization process, containing recycling system for hydrogen peroxide solution, was designed.
2. Deep desulfurization of light oils using light oil/organic apolar solvent two-phase system. In this system, DBT is extracted into acetonitrile and photooxidized to highly polarized sulfur compounds which does not distribute again into the light oil phase. Commercial light oil was successfully desulfurized to 0.05 wt% and then to 0.005 wt% sulfur content. In order to improve the process, 9, 10-dicyanoanthracene (DCA) was introduced for electron-transfer photosensitized oxidation of DBT. In the improved process, visible light (λ > 400 nm) could be utilized for the desulfurization. Overall desulfurization process was designed and evaluated by batch operation in laboratory scale, which showed that the deep desulfurization of commercial light oil to sulfur content of 0.02 wt% was successful.
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