| Project/Area Number |
07455308
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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 |
化学工学一般
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
MASUOKA Hirokatsu Hiroshima University, Faculty of Engineering, Professor, 工学部, 教授 (50034385)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Yoshiyuki Hiroshima University, Faculty of Engineering, Assistant Professor, 工学部, 助手 (50243598)
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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 |
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1995: ¥6,300,000 (Direct Cost: ¥6,300,000)
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| Keywords | Supercritical Fluid / Adsorption Equilibria / Mass Transfer / Ideal Adsorption Solution Model / Surface Diffusion / BPL Activated Carbon / High Surface Area Activated Carbon / 高圧力 |
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| Research Abstract |
The adsorption equilibrium loadings of benzene, toluene, and acetone on two adsorbents, a BPL activated carbon and a high surface area activated carbon in the presence of supercritical carbon dioxide were measured at temperature of 313 K and pressures from 1 to 12 MPa. Loading of the pure adsorbates, carbon dioxide, benzene, toluene, and acetone on these activated carbons were also measured.
At a constant partial pressure of the adsorbates, all adsorption loadings showed a maximum value at pure state and decreased with increasing pressure. On the same adsorbent benzene and toluene loadings shwed almost the same amount absorbed, while the loadings of acetone were lower than those of benzene and toluene. The adsorption loadings on the high surface area activated carbon were larger than those on the BPL activated carbon. However, pressure dependence was almost the same trend as that of BPL activated carbon. This may imply the effect of carbon dioxide adsorption over the amount of adsorbates and solvent power of carbon dioxide in fluid phase.
Prediction method of adsorption amounts in the presence of supercritical fluid was examined in this work. An ideal adsorption solution theory (IAST) reported by Prausnitz et al.was used. Prediction values of IAST were in good agreement with experimental ones.
Dynamics of adsorption of benzene dissolved in supercritical carbon dioxide on activated carbon were studied by analysis of breakthrough curves in the nonlinear region of the adsorption isotherm. Surface diffusion was found to be a main transport mechanism inside the adsorbent particles. Surface diffusion coefficients were similar to values reported by other investigators under lower pressures.
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