Theoretical Studies on Critical Properties of Binary System with Supercritical Carbon Dioxide |
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Authors: | ZHANG Jing-Chang LIU Kang CAO Wei-Liang |
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Affiliation: | Faculty of Science, Beijing University of Chemical Technology, Beijing 100029, P. R. China |
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Abstract: | A new expression of mixing rule is suggested according to the Mayson′s mixing rule in this paper, which adopts the Redlich-Kwong cubic equation of state and the modified Chueh-Prausnitz method to calculate the experiment critical points of six binary mixtures CO2+toluene, CO2+cyclohexane, CO2+n-butanal, CO2+i-butanal, CO2+methanol, CO2+ethanol. The coefficients of interaction parameter in the expression of mixing rule were optimized from experimental data. The calculated results of critical temperature and critical pressure meet the experiment data well. The maximum relative errors of temperature and pressure between the calculation results and experiment data are 1.493% and 5.2236% respectively, indicating that the proposed expression of mixing rule is reasonable. This may provide a fundamental method for studying and predicting the properties of supercritical fluids. |
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Keywords: | Supercritical fluid Critical properties Binary system Carbon dioxide |
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