Adsorption equilibrium of citric acid from supercritical carbon dioxide/ethanol on cyano column |
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Authors: | Huisheng L Guoqing Wang Minhua Zhang Zhongfeng Geng Miao Yang Yanpeng Sun |
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Affiliation: | 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 |
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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. |
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Keywords: | Adsorption isotherm Citric acid Cyano column Isotherm model |
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