Citation: Jie LU, Guan Ying YANG, Ling ZHAO, Bu Xing HAN, Hai Ke YAN. Pressure Effect on the Local Composition SurroundingEthyl Acetoacetate in Supercritical CO₂- Ethanol Mixture[J]. Chinese Chemical Letters, ;1998, 9(2): 191-196. shu

Pressure Effect on the Local Composition SurroundingEthyl Acetoacetate in Supercritical CO₂- Ethanol Mixture

Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080

Received Date: 20 May 1997

Fund Project: The authors are grateful for the financial support from the National Natural Science Foundation of China (No. 29633020).

The keto-enol tautomerization of ethyl acetoacetate (EAA) in supercritical CO₂-ethanol mixture has been investigated at 308.15 K and at different pressures using UV-Vis spectroscopy. A method for calculating the local composition about EAA has been developed based on the relationship between the equilibrium constant and dielectric property of the mixing solvent. The results indicate that the local concentration of ethanol surrounding EAA is much higher than that in the bulk.
- supercritical CO₂,
- ethanol,
- cosolvent,
- cluster,
- local density enhancement
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