Measurement and correlation of solubilities for trifluoromethylbenzoic acid isomers in supercritical carbon dioxide

Hidenori Higashi, Yoshio Iwai, Kaoru Miyazaki, Yoshiyuki Ogino, Miyuki Oki, Yasuhiko Arai

研究成果: ジャーナルへの寄稿学術誌査読

18 被引用数 (Scopus)

抄録

The solubilities of 2-, 3- and 4-trifluoromethylbenzoic acids in supercritical carbon dioxide were measured at 308.2, 313.2 and 323.2 K by a flow-type apparatus. The pressure range of the measurement was from 9 to 23 MPa. The enhancements of solubility by fluorination were markedly observed for 2- and 3-trifluoromethylbenzoic acids. The solubilities of 4-trifluoromethylbenzoic acids are almost the same as those of 4-methylbenzoic acid. The experimental data were correlated by the Peng-Robinson equation of state. The correlated results show good agreement with the experimental data by adjusting binary interaction parameters. The results can represent the tendency of solubility enhancement. The interaction parameter between carbon dioxide and 3-trifluoromethylbenzoic acid is smaller than that between carbon dioxide and 2-trifluoromethylbenzoic acid or methylbenzoic acid isomers. While the estimated sublimation pressure for 4-trifluoromethylbenzoic acid is smaller than those for the other compounds, the solubilities of 4-trifluoromethylbenzoic acids are almost the same as those of 4-methylbenzoic acid. The interaction parameter between carbon dioxide and 4-trifluoromethylbenzoic acid show the negative values. This fact indicates that the interaction between carbon dioxide and 4-trifluoromethylbenzoic acid is stronger than those between carbon dioxide and the other compounds.

本文言語英語
ページ(範囲)15-20
ページ数6
ジャーナルJournal of Supercritical Fluids
33
1
DOI
出版ステータス出版済み - 1月 2005

!!!All Science Journal Classification (ASJC) codes

  • 化学工学(全般)
  • 凝縮系物理学
  • 物理化学および理論化学

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