Decomposition of Spent CFC's with Thermal Plasma Fluidized Bed Reactor
| Project/Area Number |
07555234
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
化学工学一般
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
KANZAWA Atsushi Tokyo Institute of Technology Faculty of Engineering, Professor, 工学部, 教授 (80010908)
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| Co-Investigator(Kenkyū-buntansha) |
SEKIGUCHI Hidetoshi Tokyo Institute of Technology Faculty of Engineering, Associate Professor, 工学部, 助教授 (50226643)
WATANABE Takayuki Tokyo Institute of Technology Faculty of Engineering, Associate Professor, 工学部, 助教授 (40191770)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1996: ¥4,500,000 (Direct Cost: ¥4,500,000)
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| Keywords | thermal plasma / fluidized bed / Freon12 / calcium oxide / calcium carbonate |
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| Research Abstract |
We proposed a new decomposition method using thermal plasma fluidized bed reactor for recovery and destruction for halogenated organic compounds including CFC's. This technique was to distract halogenated organic compounds in the Ar thermal plasma and recover halogen component in the fluidized bed.
Chloromethane (CH_3Cl) was used as the simplest model of halogenated organic compounds. The decomposition was carried out with oxygen suggested by thermodynamic calculations. The Ar thermal plasma obtained by DC arc discharge was used for fluidized medium, CaO particle and CaCO_3particle for the fluidized bed. Hydrogen chloride gas formed as one of the decomposed products was reacted with CaO and CaCO_3 and fixed as CaCl_2 in the fluidized bed reactor. Chlorine element in the particle was measured with ion-meter. The experimental results showed that chloromethane was perfectly decomposed and the chlorine component was recovered in high efficiency when using CaO particle. However in case of Ca
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CO_3 particle, the recovery was not sufficient owing to deference of reaction rate and particle form. According to analysis using electron microscope, these particles were composed small grains. CaO reacted rapidly at surface layr, however CaCO_3 reacted slowly in particle uniformly.
Freon12 (CCl_2F_2) used as refrigerant was decomposed. The decomposition was carried out with oxygen and hydrogen, and CaO particle for the fluidized bed. Hydrogen chloride gas and hydrogen fluoride gas formed as the decomposed products were reacted with CaO particle and fixed as CaCl_2 and CaF_2 in the fluidized bed reactor. Chlorine and fluorine element in particle were measured with ion-chromatography. In the beginning of the reaction, chlorine element was fixed as mainly CaCl_2. Rapidly as the time proceeds, the recover of chlorine element was decrease. The other side, recovery of fluorine element fixed as CaF_2 was maintained about 0.4from the commencement of the reaction. From these results, in order to improve the low conversion of particle, continuous particle operation and increasing temperature of fluidized bed were proposed. Less
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Report
(3 results)
Research Products
(3 results)
