ICCAS OpenIR
UV-Vis spectroscopic studies of solute-solvent and solute-cosolvent interactions in supercritical carbon dioxide
Lu, J; Han, BX; Yan, HK
1999-07-15
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN1463-9076
Volume1Issue:14Pages:3269-3276
AbstractThe keto-enol tautomeric equilibria of ethyl acetoacetate in supercritical (SC) CO2 with and without ethanol cosolvent were investigated over the pressure range from 75.9 to 185 bar at 308.2 K using UV-Vis spectroscopy. In order to obtain the local densities of solvent and cosolvent about the solute, we correlated the standard Helmholtz free energy of the tautomerization with a solvent parameter based on the Onsager reaction field theory. In both SC CO2 and SC CO2-ethanol, the local density enhancement of CO2 in the vicinity of the solute is most remarkable at the reduced density close to unity. The highest degree of aggregation of cosolvent about the solute takes place at the lowest pressure investigated, which is slightly above the critical pressure. Moreover, the clustering of ethanol with the solute competes with that of CO2. In addition, the local concentration enhancement of ethanol was studied in the concentration range of 0 to 6 mol%. It was found that the local concentration of ethanol is enhanced significantly at lower cosolvent concentrations.
Indexed BySCI
Language英语
WOS IDWOS:000081545400010
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:31[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/75318
Collection中国科学院化学研究所
Corresponding AuthorHan, BX
AffiliationChinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Lu, J,Han, BX,Yan, HK. UV-Vis spectroscopic studies of solute-solvent and solute-cosolvent interactions in supercritical carbon dioxide[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,1999,1(14):3269-3276.
APA Lu, J,Han, BX,&Yan, HK.(1999).UV-Vis spectroscopic studies of solute-solvent and solute-cosolvent interactions in supercritical carbon dioxide.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,1(14),3269-3276.
MLA Lu, J,et al."UV-Vis spectroscopic studies of solute-solvent and solute-cosolvent interactions in supercritical carbon dioxide".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 1.14(1999):3269-3276.
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