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Phase behavior and reverse micelle formation in supercritical CO$$_{2}$$ with DTAB and F-pentanol for decontamination of radioactive wastes

Kurahashi, Kensuke; Tomioka, Osamu ; Meguro, Yoshihiro 

To develop a metal separation method using supercritical CO$$_{2}$$ (scCO$$_{2}$$) solvent for the decontamination process of radioactive wastes, the reverse micelle formation in scCO$$_{2}$$ was investigated. Dodecyltrimethylammonium bromide (DTAB) as a surfactant to form the reverse micelles and 2,2,3,3,4,4,5,5-octafluoro-1-pentanol (F-pentanol) as a modifier to increase the solubility of DTAB into scCO$$_{2}$$ were used. The reverse micelles could be formed by using 0.02 mol/dm$$^{3}$$ DTAB and 0.45 mol/dm$$^{3}$$ F-pentanol. A water concentration dissolved in scCO$$_{2}$$ was increased with an increase of pressure, and 0.42 mol/dm$$^{3}$$ water, which was 3 times larger than that in the neat CO$$_{2}$$, could be dissolved in scCO$$_{2}$$ at 38 MPa. Moreover, 0.1 mol/dm$$^{3}$$ HNO$$_{3}$$ could dissolve at the same pressure as water. On the other hand, it was found that the solubility of water at outside of reverse micelles increased with F-pentanol. The ratio of water and F-pentanol affected the phase behavior of water in scCO$$_{2}$$.

Language

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English

Journal

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Proceedings of 13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2010) (CD-ROM)

Volume

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Number

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Pages

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p.217 - 220

Publication Year/Month

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2011/01

Meeting title

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13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2010)

Held date

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2010/10

Location (city)

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Tsukuba

Location (country)

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Japan

Patent information

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PDF

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Paper URL

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https://doi.org/10.1115/ICEM2010-40257

DOI for research data

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Link to research data related to this paper/report.

Keywords

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no keyword

Research Facility

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第4研究棟  

Press Release

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JAEA R&D Navigator

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Development of Decontamination Technique for Radioactive Wastes Using Supercritical Fluid; Reverse Micelle Formation in Supercritical Carbon Dioxide[/]

Cooperating Institute

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Accesses

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- Accesses

InCites™

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