Phase Equilibrium of Isobutanol in Supercritical CO2

Abstract

Abstract: Vapor-liquid phase equilibrium data including composition,densities,molar volume and equilibrium constant of isobutanol in supercritical carbon dioxide from 313.2K to 353.2K were measured in a variable-volume visual cell.The properties of critical point were obtained by extrapolation.The results showed that critical temperature,critical pressure and critical compressibility factor of CO²-isobutanol system decreased with the increase of critical COM² content.The phase equilibrium model was established by Peng-Robinson equation of state and van der Waals-2 mixing regulation,and model parameters were determined by optimization calculation of nonlinear least square method.The correlation between calculated values and the experimental data showed good agreement.

Key words: supercritical carbon dioxide, isobutanol, phase equilibrium model, critical property

摘要： Vapor-liquid phase equilibrium data including composition,densities,molar volume and equilibrium constant of isobutanol in supercritical carbon dioxide from 313.2K to 353.2K were measured in a variable-volume visual cell.The properties of critical point were obtained by extrapolation.The results showed that critical temperature,critical pressure and critical compressibility factor of CO²-isobutanol system decreased with the increase of critical COM² content.The phase equilibrium model was established by Peng-Robinson equation of state and van der Waals-2 mixing regulation,and model parameters were determined by optimization calculation of nonlinear least square method.The correlation between calculated values and the experimental data showed good agreement.

关键词: supercritical carbon dioxide, isobutanol, phase equilibrium model, critical property

WANG Lin, HAO Xiaosong, ZHENG Lan, CHEN Kaixun. Phase Equilibrium of Isobutanol in Supercritical CO₂[J]. , 2009, 17(4): 642-647.

王琳, 郝小松, 郑岚, 陈开勋. Phase Equilibrium of Isobutanol in Supercritical CO₂[J]. CIESC Journal, 2009, 17(4): 642-647.

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Phase Equilibrium of Isobutanol in Supercritical CO₂

Phase Equilibrium of Isobutanol in Supercritical CO₂

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