New topic of supercritical fluids: Local activity coefficients of supercritical solvent and cosolvent around solute
文献类型：期刊论文
| 作者 | Hou, Minqiang1; Zhang, Xiaogang2; Han, Buxing1; Song, Jiyuan1; Liu, Gang1; Zhang, Zhaofu1; Zhang, Jianling1 |
| 刊名 | JOURNAL OF CHEMICAL PHYSICS
 |
| 出版日期 | 2008-03-14 |
| 卷号 | 128期号:10 |
| ISSN号 | 0021-9606 |
| DOI | 10.1063/1.2838181 |
| 英文摘要 | The study of inhomogeneity in supercritical fluids (SCFs) is of great importance. In this work, we propose the concept of local activity coefficients in supercritical (SC) solutions, which link thermodynamics and inhomogeneity in SC systems. The local activity coefficients of CO(2)+acetonitrile+phenol blue and CO(2)+acetic acid+phenol blue systems are investigated at 308.15 K in critical region and outside critical region. To do this, the local compositions of CO(2)+acetonitrile and CO(2)+acetic acid mixed solvents around phenol blue are first estimated using UV-visible spectroscopy. Then it is considered that there exist bulk phase and local phase around phenol blue in the systems. The activity coefficients of CO(2) and the cosolvents (acetonitrile or acetic acid) in bulk phase are calculated using Peng-Robinson equation of state. The local activity coefficients of CO(2) and the cosolvents are then calculated on the basis of thermodynamic principles. It is demonstrated that in the critical region the local activity coefficients differ from bulk activity coefficients significantly and are sensitive to pressure. This can explain many unusual phenomena in SC systems in critical region thermodynamically. (c) 2008 American Institute of Physics. |
| 语种 | 英语 |
| WOS记录号 | WOS:000254025300041 |
| 出版者 | AMER INST PHYSICS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/64583]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Hou, Minqiang |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100080, Peoples R China 2.Renmin Univ, Dept Chem, Beijing 100872, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hou, Minqiang,Zhang, Xiaogang,Han, Buxing,et al. New topic of supercritical fluids: Local activity coefficients of supercritical solvent and cosolvent around solute[J]. JOURNAL OF CHEMICAL PHYSICS,2008,128(10). |
| APA | Hou, Minqiang.,Zhang, Xiaogang.,Han, Buxing.,Song, Jiyuan.,Liu, Gang.,...&Zhang, Jianling.(2008).New topic of supercritical fluids: Local activity coefficients of supercritical solvent and cosolvent around solute.JOURNAL OF CHEMICAL PHYSICS,128(10). |
| MLA | Hou, Minqiang,et al."New topic of supercritical fluids: Local activity coefficients of supercritical solvent and cosolvent around solute".JOURNAL OF CHEMICAL PHYSICS 128.10(2008). |
入库方式： OAI收割
来源：化学研究所
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