Structural investigation on supercritical carbon dioxide and its mixture with alcohol

Takashi Sato, Masaaki Sugiyama, Masakatsu Misawa, Kei Hamada, Keiji Itoh, Kazuhiro Mori, Toshiharu Fukunaga

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Small-angle neutron scattering (SANS) experiments were carried out for three different systems, pure CO2, CO2 + methanol (1 mol%) and CO2 + ethanol (1 mol%), along the isotherm of 311.15 K in their supercritical states. All the SANS profiles were well analyzed with Ornstein-Zernike equation. With addition of the alcohols, the maximum values of the correlation length, ξ, and the scattering intensity at Q = 0, I(0), became larger, and the pressure at which ξ and I(0) became maxima was shifted to be lower. These changes can be explained qualitatively with van der Waals equation of state by regarding CO2 + alcohol mixture as a system consisting of a single kind of virtual molecules. From this analysis, both the molecular attractive interaction and volume are suggested to be increased in the mixture. These changes were considered to be strongly connected with the increase of solubility and selectivity on entrainer effect.

Original languageEnglish
Pages (from-to)102-106
Number of pages5
JournalJournal of Molecular Liquids
Volume147
Issue number1-2
DOIs
Publication statusPublished - Jul 20 2009
Externally publishedYes

Fingerprint

Neutron scattering
Carbon Dioxide
carbon dioxide
Carbon dioxide
neutron scattering
alcohols
Alcohols
Molecular interactions
molecular interactions
Equations of state
Methanol
Isotherms
isotherms
Ethanol
ethyl alcohol
equations of state
solubility
methyl alcohol
Solubility
selectivity

Keywords

  • Entrainer effect
  • Small-angle neutron scattering
  • Supercritical carbon dioxide

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

Cite this

Structural investigation on supercritical carbon dioxide and its mixture with alcohol. / Sato, Takashi; Sugiyama, Masaaki; Misawa, Masakatsu; Hamada, Kei; Itoh, Keiji; Mori, Kazuhiro; Fukunaga, Toshiharu.

In: Journal of Molecular Liquids, Vol. 147, No. 1-2, 20.07.2009, p. 102-106.

Research output: Contribution to journalArticle

Sato, Takashi ; Sugiyama, Masaaki ; Misawa, Masakatsu ; Hamada, Kei ; Itoh, Keiji ; Mori, Kazuhiro ; Fukunaga, Toshiharu. / Structural investigation on supercritical carbon dioxide and its mixture with alcohol. In: Journal of Molecular Liquids. 2009 ; Vol. 147, No. 1-2. pp. 102-106.
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AU - Mori, Kazuhiro

AU - Fukunaga, Toshiharu

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