Thermodynamic studies of chemical equilibrium in supercritical carbon dioxide-cosolvent solutions using UV-Vis spectroscopy
文献类型：期刊论文
| 作者 | Lu, J; Han, BX; Yan, HK |
| 刊名 | JOURNAL OF SUPERCRITICAL FLUIDS
 |
| 出版日期 | 1999-06-15 |
| 卷号 | 15期号:2页码:135-143 |
| 关键词 | Cosolvent Preferential Clustering Supercritical Co2 Tautomerism Thermodynamics |
| ISSN号 | 0896-8446 |
| 英文摘要 | The keto-enol tautomeric equilibrium of 5,5-dimethyl-1,3-cyclohexanedione (dimedone) was investigated using UV-Vis spectroscopy in various solvents, including liquid acetonitrile (CH3CN), supercritical carbon dioxide (SC CO2) and SC CO2-CH3CN. The content of the enol tautomer in liquid CH3CN is much higher than that in SC CO2. With the addition of a small amount of cosolvent CH3CN into SC CO2, the enol content increases with respect to that in pure SC CO2. The comparison of thermodynamic functions for the tautomerism was made in these solvents. It was found that the change of standard internal energy (Delta U-0) in SC CO2-CH3CN is close to that in liquid CH3CN and remarkably different from that in pure CO2. On the other hand, the maximum decrease in the change of the standard entropy (Delta S-0) was observed in SC CO2-CH3CN. It indicates that the cosolvent preferentially aggregates about the two tautomers. The Delta S-0 becomes the dominant thermodynamic driving force of the tautomerization in the cosolvent-modified SC CO2. (C) 1999 Elsevier Science B.V. All rights reserved. |
| 语种 | 英语 |
| WOS记录号 | WOS:000080566200005 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/75391]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Han, BX |
| 作者单位 | Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lu, J,Han, BX,Yan, HK. Thermodynamic studies of chemical equilibrium in supercritical carbon dioxide-cosolvent solutions using UV-Vis spectroscopy[J]. JOURNAL OF SUPERCRITICAL FLUIDS,1999,15(2):135-143. |
| APA | Lu, J,Han, BX,&Yan, HK.(1999).Thermodynamic studies of chemical equilibrium in supercritical carbon dioxide-cosolvent solutions using UV-Vis spectroscopy.JOURNAL OF SUPERCRITICAL FLUIDS,15(2),135-143. |
| MLA | Lu, J,et al."Thermodynamic studies of chemical equilibrium in supercritical carbon dioxide-cosolvent solutions using UV-Vis spectroscopy".JOURNAL OF SUPERCRITICAL FLUIDS 15.2(1999):135-143. |
入库方式： OAI收割
来源：化学研究所
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