Phase Equilibrium of Isobutanol in Supercritical CO2  

作　　者：王琳 郝小松 郑岚 陈开勋 

机构地区：[1]Chemical Engineering College, Northwest University, Xi'an 710069, China [2]Chemistry and Pharmaceutical Engineering College, Nanyang Normal University, Nanyang 473061, China

出　　处：《Chinese Journal of Chemical Engineering》2009年第4期642-647,共6页中国化学工程学报（英文版）

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 CO2 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.Vapor-liquid phase equilibrium data including composition, densities, molar volume and equilibrium constant of isobutanol in supercritical carbon dioxide from 313.2 K to 353.2 K 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 CO2 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 

分 类 号：O625.11[理学—有机化学] TS193.59[理学—化学]