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

Huisheng Lü; GuoqingWang; Minhua Zhang; Zhongfeng Geng; Miao Yang; Yanpeng Sun

doi:10.1016/j.cjche.2013.10.002

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

分离科学与工程 | Updated：2026-01-06

- Adsorption equilibrium of citric acid from supercritical carbon dioxide/ethanol on cyano column
- Chinese Journal of Chemical Engineering Issue 6, Pages: 905-911(2015)
- Affiliations：
  
  1. Key Laboratory for Green Chemical Technology of the Ministry of Education, Tianjin University R&D Center for Petrochemical Technology,Tianjin,China,300072
  2. 2 Petro China Northeast Refining & Chemical Engineering Co. Ltd., Jilin Design Institute,Jilin,China,132000
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2013.10.002
  CLC：
- Published：2015
- Accepted：
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Huisheng Lü, GuoqingWang, Minhua Zhang, et al. Adsorption equilibrium of citric acid from supercritical carbon dioxide/ethanol on cyano column[J]. Chinese Journal of Chemical Engineering, 2015, (6): 905-911.
DOI：

Huisheng Lü, GuoqingWang, Minhua Zhang, et al. Adsorption equilibrium of citric acid from supercritical carbon dioxide/ethanol on cyano column[J]. Chinese Journal of Chemical Engineering, 2015, (6): 905-911. DOI： 10.1016/j.cjche.2013.10.002.

摘要

Abstract

Supercritical adsorption equilibrium has a significant role in defining supercritical adsorption behavior. In this paper

the adsorption equilibrium of citric acid from supercritical CO

/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 CO

/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 CO

/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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