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

doi:10.1016/j.cjche.2013.10.002

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (6): 905-911.DOI: 10.1016/j.cjche.2013.10.002

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 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

收稿日期:2013-05-02 修回日期:2013-10-22 出版日期:2015-06-28 发布日期:2015-07-09
通讯作者: 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 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:2015-06-28 Published:2015-07-09
Contact: Minhua Zhang

摘要/Abstract

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

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

Huisheng Lü, GuoqingWang, Minhua Zhang, Zhongfeng Geng, Miao Yang, Yanpeng Sun. Adsorption equilibrium of citric acid from supercritical carbon dioxide/ethanol on cyano column[J]. Chinese Journal of Chemical Engineering, 2015, 23(6): 905-911.

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

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

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