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Determination of Critical parameters of Carbon Dioxide+Butyraldehyde System with Different Compositions

Chemical Research in Chinese Universities 2005年第6期21卷 687-691页

作者： ZHANG Jing-chang GAO Xi-xin CAO Wei-liang Key Laboratory of Science and technology of Controllable Chemical Reactions of Ministry of Education Institute of Modern Catalysis Beijing University of Chemical Technology Beijing 100029 P. R. China

Supercritical carbon dioxide（SC-CO2 ） is considered in green chemistry as a substitute for conventional solvents in chemical reactions due to its environmentally benign character. Recently we have reported the homogeneous hydroformylation of propylene in supercritical carbon dioxide（ SC-CO2 ） , which is an example of this kind of application of carbon dioxide. the determination for the critical parameters of carbon dioxide ＋ butyraldehyde mixtures is necessary for this reaction design which is the focus of the present paper. the critical parameters of the binary systems were determined via the static visual method at a constant volume with the molar fraction of butyraldehyde ranging from 1.0% to 2. 2% and the pressure ranging from 5 to 10 Mpa. the experimental results show that the critical pressure and temperature increased with increasing the molar fraction of butyraldehyde. the bubble（dew） temperatures and the bubble （dew） pressures for the binary systems were also determined experimentally. the p-t figures at different compositions of the binary systems were described. In addition, the critical compressibility factors Zc of the binary systems at different concentrations of n-butyraldehyde were calculated. It was found that the critical compressibility factor values of the binary systems decreased with increasing the molar fraction of n-butyraldehyde in the experimental range.

关键词： Carbon dioxide + butyraldehyde binary system Critical temperature Critical pressure p-t figure Critical compressibility factor

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