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• W2013105478 abstract "The critical parameters, phase behavior, and density of the reaction system for the transesterification between ethyl acetate and n-butanol in compressed CO2 was determined. The isothermal compressibility KT of the reaction system was calculated using the density data. On the basis of the phase behavior, the equilibrium constant Kx of the reaction at different conditions was measured, and the effect of pressure and composition on the Kx was studied in the critical region and outside the critical region of the reaction system. The Peng−Robinson equation of state was used to predict the Kx at different conditions. It was demonstrated that the Kx was very sensitive to pressure as the reaction mixture approaches the critical point (CP), bubble point (BP), and dew point (DP) in the critical region, whereas the effect of pressure on Kx was not significant outside the critical region. The sensitivity of Kx to pressure is closely related with the KT of the reaction mixture. It is interesting that the Kx increases significantly as the pressure approaches the DP and CP, whereas it decreases as the pressure approaches the BP; i.e., pressure has the opposite effect on the Kx in the subcritical region and in the supercritical region. The Peng−Robinson equation of state can predict the Kx far from the critical region satisfactorily. However, the difference of the predicted results and the experimental data becomes larger as the reaction system approaches the CP, BP, and DP in the critical region. All the phenomena may be related with the special intermolecular interaction in the critical region, which affects the fugacity coefficients of the reactants and products. The results of this work also illustrate that the reaction can be carried out in the critical region with a suitable amount of CO2, whereas this is impossible without the solvent. Therefore, the clean solvent can also be used as a green solvent to adjust the critical point and phase behaviors of the reaction system, so that the reaction can take place in the critical region, and the reaction can be tuned effectively by pressure. Reaction in the critical region of the reaction mixtures is an interesting field where lots of new concepts and new experimental findings are to be investigated." @default.
• W2013105478 created "2016-06-24" @default.
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• W2013105478 date "2003-10-31" @default.
• W2013105478 modified "2023-09-24" @default.
• W2013105478 title "Transesterification between Ethyl Acetate and <i>n</i>-Butanol in Compressed CO₂ in the Critical Region of the Reaction System" @default.
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• W2013105478 doi "https://doi.org/10.1021/jp035078r" @default.
• W2013105478 hasPublicationYear "2003" @default.
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