| Project/Area Number |
08558066
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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 | 展開研究 |
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| Research Field |
環境保全
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| Research Institution | University of Tokushima |
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Principal Investigator |
HAYASHI Hiromu University of Tokushima, Faculty of Engineering, Professor, 工学部, 教授 (00035627)
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| Co-Investigator(Kenkyū-buntansha) |
HIRANO Shinichi Shikoku Research Institute, Inc., Chemical Technology Division, Senior Researche, 化学技術部, 副首席研究員
SUGIYAMA Shigeru University of Tokushima, Faculty of Engineering, Lecturer, 工学部, 講師 (70175404)
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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 |
¥12,100,000 (Direct Cost: ¥12,100,000)
Fiscal Year 1997: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1996: ¥9,000,000 (Direct Cost: ¥9,000,000)
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| Keywords | Potassium carbonate / carbon / Moist carbon dioxide / Flue gases / Cyclic fixed-bed operations / Bench-scale plant |
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| Research Abstract |
An efficient chemical absorption method capable of cyclic fixed-bed operations under moist conditions for the recovery of carbon dioxide from gases has been proposed employing K_2CO_3-on-carbon. Carbon dioxide was chemically absorbed by the reaction K_2CO_3 + CO_2 + H_2O <double arrow> 2KHCO_3 to form potassium hydrogencarbonate. Moisture, usually contained as high as 8-17% in flue gases, badly affects the capacity of conventional adsorbents such as zeolites, but the presente technology has no concern with moisture ; water is rather necessary in principle as shown in thequation above. Deliquescent potassium carbonate should be supported on an appropriate porous material to adapt for fixed-bed operations. After breakthrough of carbon dioxide, the entrapped carbon dioxide was released by the decomposition of hydrogencarbonte to shift the reaction in reverse on flushing with steam, which could be condensed by cooling to afford carbon dioxide in high purity. Among various preparations of alkaline-earth carbonates (X_2CO_3, X=Li, Na, K) on porous materials, K_2CO_3-on-activated carbon revealed excellent properties for the present purpose. Preparation and characterization of K_2CO_3-on-carbon, and illustrative fixed-bed operations under flue gas conditions in laboratory columns and a bench-scale plant are described.
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