ICCAS OpenIR
Direct measurements of the enthalpy of solution of solid solute in supercritical fluids: Study on the CO2-naphthalene system
Zhang, XG; Han, BX; Zhang, JL; Li, HP; He, J; Yan, HK
2001-10-01
Source PublicationCHEMISTRY-A EUROPEAN JOURNAL
ISSN0947-6539
Volume7Issue:19Pages:4237-4242
AbstractA setup for a calorimeter for simultaneously measuring the solubility and the solution enthalpy of solid solutes in supercritical fluids (SCFs) has been established. The enthalpy of solution of naphthalene in supercritical CO2 was measured at 308.15 K in the pressure range from 8.0 - 11.0 MPa. It was found that the enthalpy of solution (DeltaH) was negative in the pressure range from 8.0 to 9.5 MPa. and the absolute value decreased with increasing pressure. In this pressure range, the dissolution of the solute was enthalpy driven. However, the DeltaH became positive at pressures higher than 9.5 MPa. and the dissolution was entropy driven. Monte Carlo simulation was performed to analyze the local structural environment of the solvated naphthalene molecules in supercritical CO2 under the experimental conditions for the calorimetric measurements. By combining the enthalpy data and the simulation results, it can be deduced that the energy level of CO2 in the high compressible region is higher than that at higher pressures. which results in the large negative enthalpy of solution and the larger degree of solvent-solute clustering in the high compressible region.
KeywordCalorimetry Carbon Dioxide Naphthalene Solution Enthalpy Supercritical Fluids
Indexed BySCI
Language英语
WOS IDWOS:000171452800020
PublisherWILEY-V C H VERLAG GMBH
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/77416
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
Zhang, XG,Han, BX,Zhang, JL,et al. Direct measurements of the enthalpy of solution of solid solute in supercritical fluids: Study on the CO2-naphthalene system[J]. CHEMISTRY-A EUROPEAN JOURNAL,2001,7(19):4237-4242.
APA Zhang, XG,Han, BX,Zhang, JL,Li, HP,He, J,&Yan, HK.(2001).Direct measurements of the enthalpy of solution of solid solute in supercritical fluids: Study on the CO2-naphthalene system.CHEMISTRY-A EUROPEAN JOURNAL,7(19),4237-4242.
MLA Zhang, XG,et al."Direct measurements of the enthalpy of solution of solid solute in supercritical fluids: Study on the CO2-naphthalene system".CHEMISTRY-A EUROPEAN JOURNAL 7.19(2001):4237-4242.
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