2002年5月
The role of general and hydrogen-bonding interactions in the solvation processes of organic compounds by supercritical CO2/n-alcohol mixtures
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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- 巻
- 41
- 号
- 9
- 開始ページ
- 2074
- 終了ページ
- 2081
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1021/ie0106332
- 出版者・発行元
- AMER CHEMICAL SOC
UV/visible absorption spectroscopy was applied to measure the microscopic solvent dipolarity/polarizability, pi*, and hydrogen-bond-acceptor basicity, beta, parameters, of supercritical CO2/n-alcohol mixtures. Experiments were conducted at 45 degreesC by varying the pressure between 86 and 230 bar, the type of n-alcohol from methanol to n-hexanol, and the n-alcohol mole fraction, x(2), from 0 to 0.05. The effect of our experimental conditions on maximum Deltapi* changes can be represented in the following order: system pressure (Deltapi* approximate to 0.4) > n-alcohol mole fraction (Deltapi* approximate to 0.3) > type of n-alcohol (Deltapi* approximate to 0.1). However, the corresponding order for Deltabeta changes was as follows: n-alcohol mole fraction (Deltabeta approximate to 0.6) > type of n-alcohol (Deltabeta approximate to 0.3) > system pressure (Deltabeta approximate to -0.1). Under our experimental conditions, the pi* parameters of the mixtures were below the corresponding value for liquid cyclohexane, whereas beta parameters at x(2) = 0.05 approached the values for liquid alcohols under ambient conditions, Because the solvent strength for CO2/methanol mixtures can be varied over the widest range by changing the methanol mole fraction and system pressure, methanol is the best cosolvent among the n-alcohols studied here.
- リンク情報
- ID情報
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- DOI : 10.1021/ie0106332
- ISSN : 0888-5885
- CiNii Articles ID : 80015270103
- Web of Science ID : WOS:000175243500002