SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2015, Vol. 23 ›› Issue (6): 905-911.DOI: 10.1016/j.cjche.2013.10.002

• SEPARATION SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Adsorption equilibrium of citric acid from supercritical carbon dioxide/ethanol on cyano column

Huisheng Lü1, GuoqingWang1, Minhua Zhang1, Zhongfeng Geng1, Miao Yang2, Yanpeng Sun1   

  1. 1 Key Laboratory for Green Chemical Technology of the Ministry of Education, Tianjin University R&D Center for Petrochemical Technology, Tianjin 300072, China;
    2 Petro China Northeast Refining & Chemical Engineering Co. Ltd., Jilin Design Institute, Jilin 132000, China
  • Received:2013-05-02 Revised:2013-10-22 Online:2015-07-09 Published:2015-06-28
  • Contact: Minhua Zhang

Adsorption equilibrium of citric acid from supercritical carbon dioxide/ethanol on cyano column

Huisheng Lü1, GuoqingWang1, Minhua Zhang1, Zhongfeng Geng1, Miao Yang2, Yanpeng Sun1   

  1. 1 Key Laboratory for Green Chemical Technology of the Ministry of Education, Tianjin University R&D Center for Petrochemical Technology, Tianjin 300072, China;
    2 Petro China Northeast Refining & Chemical Engineering Co. Ltd., Jilin Design Institute, Jilin 132000, China
  • 通讯作者: Minhua Zhang

Abstract: Supercritical adsorption equilibrium has a significant role in defining supercritical adsorption behavior. In this paper, the adsorption equilibrium of citric acid from supercritical CO2/ethanol on a cyano column was systematically investigatedwith the elution by characteristic pointmethod. Equilibriumloadingwas obtained at 313.15 K and 321.15 K with supercritical CO2/ethanol densities varying from0.7068 g·cm-3 to 0.8019 g·cm-3. The experimental results showed that the adsorption capacity of citric acid decreasedwith increasing temperature and increasing density of the supercritical CO2/ethanol mobile phase. The adsorption equilibrium data were fitted well by the Quadratic Hill isotherm model and the isotherms showed anti-Langmuir behavior. Themonolayer saturation adsorption capacity of citric acid is in the range of 44.54mg·cm-3 to 64.66mg·cm-3 with an average value of 56.86 mg·cm-3.

Key words: Adsorption isotherm, Citric acid, Cyano column, Isotherm model

摘要: Supercritical adsorption equilibrium has a significant role in defining supercritical adsorption behavior. In this paper, the adsorption equilibrium of citric acid from supercritical CO2/ethanol on a cyano column was systematically investigatedwith the elution by characteristic pointmethod. Equilibriumloadingwas obtained at 313.15 K and 321.15 K with supercritical CO2/ethanol densities varying from0.7068 g·cm-3 to 0.8019 g·cm-3. The experimental results showed that the adsorption capacity of citric acid decreasedwith increasing temperature and increasing density of the supercritical CO2/ethanol mobile phase. The adsorption equilibrium data were fitted well by the Quadratic Hill isotherm model and the isotherms showed anti-Langmuir behavior. Themonolayer saturation adsorption capacity of citric acid is in the range of 44.54mg·cm-3 to 64.66mg·cm-3 with an average value of 56.86 mg·cm-3.

关键词: Adsorption isotherm, Citric acid, Cyano column, Isotherm model