ICCAS OpenIR
New topic of supercritical fluids: Local activity coefficients of supercritical solvent and cosolvent around solute
Hou, Minqiang1; Zhang, Xiaogang2; Han, Buxing1; Song, Jiyuan1; Liu, Gang1; Zhang, Zhaofu1; Zhang, Jianling1
2008-03-14
Source PublicationJOURNAL OF CHEMICAL PHYSICS
ISSN0021-9606
Volume128Issue:10
AbstractThe 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.
DOI10.1063/1.2838181
Indexed BySCI
Language英语
WOS IDWOS:000254025300041
PublisherAMER INST PHYSICS
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/64584
Collection中国科学院化学研究所
Corresponding AuthorHou, Minqiang
Affiliation1.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
Recommended Citation
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).
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