TY - JOUR
T1 - Measurement and correlation of solubilities for trifluoromethylbenzoic acid isomers in supercritical carbon dioxide
AU - Higashi, Hidenori
AU - Iwai, Yoshio
AU - Miyazaki, Kaoru
AU - Ogino, Yoshiyuki
AU - Oki, Miyuki
AU - Arai, Yasuhiko
N1 - Funding Information:
The present study was supported in part by a Grant-in-Aid for the 21st century center of excellent (COE) program, “Functional Innovation of Molecular Informatics”, from the Ministry of Education, Science, Sports and Culture of Japan and a grant provided by NEDO (via JCII) based on the project “Res. & Dev. of Enviromentally Friendly Tech. Using SCF” of Ind. Sci. Tech. Frontier Program (METI).
PY - 2005/1
Y1 - 2005/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=7444251755&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=7444251755&partnerID=8YFLogxK
U2 - 10.1016/j.supflu.2004.03.006
DO - 10.1016/j.supflu.2004.03.006
M3 - Article
AN - SCOPUS:7444251755
VL - 33
SP - 15
EP - 20
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
SN - 0896-8446
IS - 1
ER -