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Effect of phase behavior and pressure on the constant-volume heat capacity and intermolecular interaction of CO2-ethanol and CO2-n-pentane mixtures in the critical region
Li, HP; Zhang, XG; Han, BX; Liu, J; He, J; Liu, ZM
2002-01-18
Source PublicationCHEMISTRY-A EUROPEAN JOURNAL
ISSN0947-6539
Volume8Issue:2Pages:451-456
AbstractStudy on the properties of the fluids near the critical point of mixed systems is a key for the development of supercritical (SC) technology and for the further understanding of the features of supercritical fluids (SCFs). The constant-volume molar heat capacity (C-v) of a solution is directly related to the internal energy, intermolecular interaction, and the microstructure of the solution. In this work, the C-v of CO2-n-pentane and CO2-ethanol systems was determined at 308.15 K in different phase regions. This work focuses on how the properties of the mixtures change with pressure, composition, and the structure of the components near the critical point of the mixtures. It was found that at fixed composition, a maximum in C-v versus pressure curve exists (C-v(max)) that occurs at the pressure at which the isothermal compressibility (K-T) is the largest. We deduced that breaking the "'clusters" in the SC mixtures is an endothermic process. It is very interesting that C-v increases sharply as the pressure approaches the critical point (CP) or bubble point (BP), while C-v is nearly independent of pressure and composition at the pressures well above the CP or BP pressure, and that the C-v at CP or BP can be several times larger than that at the high pressures. It can be deduced that at fixed composition the degree of "clustering" changes significantly with pressure near the CP or BP, and is the largest at CP and BP.
KeywordCritical Region Heat Capacity Molecular Interactions Phase Diagrams Supercritical Fluids
Indexed BySCI
Language英语
WOS IDWOS:000173483700014
PublisherWILEY-V C H VERLAG GMBH
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/78810
Collection中国科学院化学研究所
Corresponding AuthorHan, BX
AffiliationChinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Li, HP,Zhang, XG,Han, BX,et al. Effect of phase behavior and pressure on the constant-volume heat capacity and intermolecular interaction of CO2-ethanol and CO2-n-pentane mixtures in the critical region[J]. CHEMISTRY-A EUROPEAN JOURNAL,2002,8(2):451-456.
APA Li, HP,Zhang, XG,Han, BX,Liu, J,He, J,&Liu, ZM.(2002).Effect of phase behavior and pressure on the constant-volume heat capacity and intermolecular interaction of CO2-ethanol and CO2-n-pentane mixtures in the critical region.CHEMISTRY-A EUROPEAN JOURNAL,8(2),451-456.
MLA Li, HP,et al."Effect of phase behavior and pressure on the constant-volume heat capacity and intermolecular interaction of CO2-ethanol and CO2-n-pentane mixtures in the critical region".CHEMISTRY-A EUROPEAN JOURNAL 8.2(2002):451-456.
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