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

作     者：吕惠生 王国庆 张敏华 耿中峰 杨淼 孙艳朋 

作者机构：Key Laboratory for Green Chemical Technology of the Ministry of Education Tianjin University R&D Center for Petrochemical Technology Petro China Northeast Refining & Chemical Engineering Co. Ltd.Jilin Design Institute 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2015年第23卷第6期

页      面：905-911页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

主　　题：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 investigated with the elution by characteristic point method. Equilibrium loading was obtained at 313.15 K and 321.15 K with supercritical CO2/ethanol densities varying from 0.7068 g·cm-3to 0.8019 g·cm-3. The experimental results showed that the adsorption capacity of citric acid decreased with 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. The monolayer saturation adsorption capacity of citric acid is in the range of 44.54 mg·cm-3to 64.66 mg·cm-3with an average value of 56.86 mg·cm-3.