화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.19, No.6, 1007-1013, November, 2002
DOI10.1007/BF02707225  Export Citation
High Pressure Phase Behavior for Carbon Dioxide-1-Butanol and Carbon Dioxide-1-Octanol Systems
Hun-Soo Byun†, and Chul Kwak1
  • Department of Chemical Engineering, Yosu National University, Yosu, Chonnam 550-749, Korea
  • 1School of Chemical Engineering, Kyungnam University, Masan, Kyungnam 550-701, Korea
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Pressure-composition isotherms are obtained for binary mixtures of carbon dioxide-1-butanol and carbon dioxide-1-octanol systems at 40, 60, 80, 100, and 120 ℃ and pressures up to 220 bar. The accuracy of the experimental apparatus was tested by comparing the measured phase equilibria data of the carbon dioxide-1-butanol system at 40 ℃ with those of Ishihara et al. [1996]. The solubility of 1-butanol and 1-octanol for the carbon dioxide-1-butanol and carbon dioxide-1-octanol systems increases as the temperature increases at constant pressure. The carbon dioxide-1-butanol and carbon dioxide-1-octanol systems have continuous critical mixture curves that exhibit maximums in pressure at temperatures between the critical temperatures of carbon dioxide- and 1-butanol or 1-octanol. The carbon dioxide-1-butanol system exhibits type-I phase behavior, characterized by a continuous critical line from pure carbon dioxide, to the second component with a maximum in pressure. Also, the carbon dioxide-1-octanol system exhibits type-I curve at 60-120 ℃, and shows liquid-liquid-vapor phase behavior at 40 ℃. The experimental results for the carbon dioxide-1-butanol and carbon dioxide-1-octanol systems have been modeled by the Peng-Robinson equation of state. A good fit of the data is obtained with the Peng-Robinson equation by using two adjustable interaction parameters for the carbon dioxide-1-butanol system and a poor fit using two adjustable parameters for the carbon dioxide-1-octanol mixture.
Keywords:Phase Behavior;Carbon Dioxide-1-Butanol System;Carbon Dioxide-1-Octanol System;Peng-Robinson Equation of State
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