Why do co-solvents enhance the solubility of solutes in supercritical fluids? New evidence and opinion

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	Why do co-solvents enhance the solubility of solutes in supercritical fluids? New evidence and opinion
	Zhang, XG; Han, BX; Hou, ZS; Zhang, HL; Liu, ZM; Jiang, T; He, J; Li, HP
刊名	CHEMISTRY-A EUROPEAN JOURNAL
	2002-11-15
卷号	8 期号:22 页码:5107-5111
关键词	Calorimetry Co-solvent Solution Enthalpy Solvent Effects Supercritical Fluids
ISSN号	0947-6539
英文摘要	The effects of two polar co-solvents, chlorodifluoromethane and acetone, on the solubility and enthalpy of a solution of 1,4-naphthoquinone in supercritical (SC) CO2 were studied. We found that the dissolution process becomes less exothermic in the presence of the co-solvents relative to that in pure CO2, although the solubility is enhanced significantly by the co-solvents. This indicates that the increase in the solubility by adding co-solvents results from the increase of the entropy of solution. On the basis of the unexpected results we propose a new mechanism for the solubility enhancement of the solute by the co-solvents in supercritical fluids (SCF); this should be applicable to cases in which the local density of the SC solvent around the solute and the co-solvent is larger, and the co-solvent associates preferentially with the solute. The results are also very important for the understanding of other fundamental questions of SCF science, such as the effect of co-solvents on the thermodynamic and kinetic properties of the reactions in SCFs.
语种	英语
出版者	WILEY-V C H VERLAG GMBH
WOS记录号	WOS:000179437700007
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/79185]
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, Ctr Mol Sci, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Zhang, XG,Han, BX,Hou, ZS,et al. Why do co-solvents enhance the solubility of solutes in supercritical fluids? New evidence and opinion[J]. CHEMISTRY-A EUROPEAN JOURNAL,2002,8(22):5107-5111.
APA	Zhang, XG.,Han, BX.,Hou, ZS.,Zhang, HL.,Liu, ZM.,...&Li, HP.(2002).Why do co-solvents enhance the solubility of solutes in supercritical fluids? New evidence and opinion.CHEMISTRY-A EUROPEAN JOURNAL,8(22),5107-5111.
MLA	Zhang, XG,et al."Why do co-solvents enhance the solubility of solutes in supercritical fluids? New evidence and opinion".CHEMISTRY-A EUROPEAN JOURNAL 8.22(2002):5107-5111.