Adsorption equilibria of paeoniflorin and albiflorin on cyano-silica column from supercritical carbon dioxide/ethanol

doi:10.1016/j.cjche.2018.05.026

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (4): 827-834.DOI: 10.1016/j.cjche.2018.05.026

• Separation Science and Engineering • 上一篇下一篇

Adsorption equilibria of paeoniflorin and albiflorin on cyano-silica column from supercritical carbon dioxide/ethanol

Huisheng Lü^1,2, Zhi Wang^1,2, Zhongfeng Geng^1,2, Yonghui Li^1,2, Shuangyan Liu^1,2, Jiatao Liu^1,2

1 Key Laboratory for Green Chemical Technology of Ministry of Education, R & D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China;
2 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China

收稿日期:2018-03-26 修回日期:2018-05-22 出版日期:2019-04-28 发布日期:2019-06-14
通讯作者: Yonghui Li
基金资助:
Corresponding author at:Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China.

Adsorption equilibria of paeoniflorin and albiflorin on cyano-silica column from supercritical carbon dioxide/ethanol

Huisheng Lü^1,2, Zhi Wang^1,2, Zhongfeng Geng^1,2, Yonghui Li^1,2, Shuangyan Liu^1,2, Jiatao Liu^1,2

1 Key Laboratory for Green Chemical Technology of Ministry of Education, R & D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China;
2 Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China

Received:2018-03-26 Revised:2018-05-22 Online:2019-04-28 Published:2019-06-14
Contact: Yonghui Li
Supported by:
Corresponding author at:Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China.

摘要/Abstract

摘要： Adsorption equilibria of paeoniflorin and albiflorin on a cyano-silica column (CN column) from the solution of supercritical carbon dioxide (scCO₂) modified with ethanol were studied. The adsorption capacity at 308.15 K, 313.15 K, 318.15 K and 323.15 K under pressures corresponding to carbon dioxide/ethanol densities from 0.347 g·cm^-3 to 0.662 g·cm^-3 were determined using the elution by characteristic point method (ECP). The effects of temperature and pressure on the solute loading were investigated. The results showed that the lower the temperature, the higher the adsorption capacity. With the decrease of density of scCO₂, the adsorption capacity strengthens. The maximum adsorption capacity of paeoniflorin (albiflorin) on the CN column was 15.24 mg·ml^-1 (31.14 mg·ml^-1) in the range of 0-1.84 mg·ml^-1 (0-1.67 mg·ml^-1) of paeoniflorin (albiflorin) standard solution. The adsorption capacity of albiflorin was twice as much as that of paeoniflorin under the same conditions. Adsorption data of paeoniflorin and albiflorin could be well described by the Langmuir model and Freundlich model. Compared with the two model fitting results, the adsorption of paeoniflorin and albiflorin belonged to the monolayer adsorption under conditions of 308.15-323.15 K and 10-17 MPa.

关键词: Adsorption, Supercritical carbon dioxide, Paeoniflorin, Albiflorin, Isotherm model

Abstract: Adsorption equilibria of paeoniflorin and albiflorin on a cyano-silica column (CN column) from the solution of supercritical carbon dioxide (scCO₂) modified with ethanol were studied. The adsorption capacity at 308.15 K, 313.15 K, 318.15 K and 323.15 K under pressures corresponding to carbon dioxide/ethanol densities from 0.347 g·cm^-3 to 0.662 g·cm^-3 were determined using the elution by characteristic point method (ECP). The effects of temperature and pressure on the solute loading were investigated. The results showed that the lower the temperature, the higher the adsorption capacity. With the decrease of density of scCO₂, the adsorption capacity strengthens. The maximum adsorption capacity of paeoniflorin (albiflorin) on the CN column was 15.24 mg·ml^-1 (31.14 mg·ml^-1) in the range of 0-1.84 mg·ml^-1 (0-1.67 mg·ml^-1) of paeoniflorin (albiflorin) standard solution. The adsorption capacity of albiflorin was twice as much as that of paeoniflorin under the same conditions. Adsorption data of paeoniflorin and albiflorin could be well described by the Langmuir model and Freundlich model. Compared with the two model fitting results, the adsorption of paeoniflorin and albiflorin belonged to the monolayer adsorption under conditions of 308.15-323.15 K and 10-17 MPa.

Key words: Adsorption, Supercritical carbon dioxide, Paeoniflorin, Albiflorin, Isotherm model

Huisheng Lü, Zhi Wang, Zhongfeng Geng, Yonghui Li, Shuangyan Liu, Jiatao Liu. Adsorption equilibria of paeoniflorin and albiflorin on cyano-silica column from supercritical carbon dioxide/ethanol[J]. 中国化学工程学报, 2019, 27(4): 827-834.

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Adsorption equilibria of paeoniflorin and albiflorin on cyano-silica column from supercritical carbon dioxide/ethanol

Adsorption equilibria of paeoniflorin and albiflorin on cyano-silica column from supercritical carbon dioxide/ethanol

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