Enhancing the separation performance by introducing bioadhesive bonding layer in composite pervaporation membranes for ethanol dehydration

doi:10.1016/j.cjche.2014.11.022

›› 2015, Vol. 23 ›› Issue (2): 372-378.DOI: 10.1016/j.cjche.2014.11.022

• SEPARATION SCIENCE AND ENGINEERING • Previous Articles Next Articles

Enhancing the separation performance by introducing bioadhesive bonding layer in composite pervaporation membranes for ethanol dehydration

Hong Wu^1,2,3, Tiantian Zhou^1,2, Xianshi Li^1,2, Cuihong Zhao^1,2, Zhongyi Jiang^1,2

1 Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China;
3 Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China

Received:2014-06-26 Revised:2014-11-07 Online:2015-03-01 Published:2015-02-28
Supported by:
Supported by the New Century Excellent Talents in University (NCET-10-0623), the National Natural Science Foundation for Distinguished Young Scholars (21125627), the National Basic Research Program of China (2009CB623404), and State Key Laboratory for Modification of Chemical Fibers and Polymer Materials (Dong Hua University).

Enhancing the separation performance by introducing bioadhesive bonding layer in composite pervaporation membranes for ethanol dehydration

Hong Wu^1,2,3, Tiantian Zhou^1,2, Xianshi Li^1,2, Cuihong Zhao^1,2, Zhongyi Jiang^1,2

1 Key Laboratory for Green Chemical Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China;
3 Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China

通讯作者: Zhongyi Jiang
基金资助:
Supported by the New Century Excellent Talents in University (NCET-10-0623), the National Natural Science Foundation for Distinguished Young Scholars (21125627), the National Basic Research Program of China (2009CB623404), and State Key Laboratory for Modification of Chemical Fibers and Polymer Materials (Dong Hua University).

Abstract

Abstract: A high performance composite membrane was prepared under the inspiration of bioadhesion principles for pervaporative dehydration of ethanol. Chitosan (CS) and polyacrylonitrile (PAN) ultrafiltration membranes were used as the active layer and the support layer, respectively. Guar gum (GG), a natural bioadhesive, was introduced as the intermediate bonding layer to improve the separation performance and stability of the fabricated CS/GG/PAN composite membranes. The contact angle of the GG layerwas just between those of the CS layer and the PAN layer, minimizing the difference of hydrophilicity between the active layer and the support layer. The peeling strength of the composite membrane was significantly enhanced after the introduction of the GG layer. The effects of preparation conditions and operation conditions including GG concentration, operating temperature and ethanol concentration in feed on the pervaporation performance were investigated. The as-fabricated CS/GG/PAN composite membrane showed the optimum performance with a permeation flux of up to 804 g·m^-2·h^-1 and a separation factor higher than 1900. Besides, the compositemembranes exhibited a desirable long-term operational stability.

Key words: Pervaporative ethanol dehydration, Composite membrane, Bonding layer, Bioadhesive, Guar gum

摘要： A high performance composite membrane was prepared under the inspiration of bioadhesion principles for pervaporative dehydration of ethanol. Chitosan (CS) and polyacrylonitrile (PAN) ultrafiltration membranes were used as the active layer and the support layer, respectively. Guar gum (GG), a natural bioadhesive, was introduced as the intermediate bonding layer to improve the separation performance and stability of the fabricated CS/GG/PAN composite membranes. The contact angle of the GG layerwas just between those of the CS layer and the PAN layer, minimizing the difference of hydrophilicity between the active layer and the support layer. The peeling strength of the composite membrane was significantly enhanced after the introduction of the GG layer. The effects of preparation conditions and operation conditions including GG concentration, operating temperature and ethanol concentration in feed on the pervaporation performance were investigated. The as-fabricated CS/GG/PAN composite membrane showed the optimum performance with a permeation flux of up to 804 g·m^-2·h^-1 and a separation factor higher than 1900. Besides, the compositemembranes exhibited a desirable long-term operational stability.

关键词: Pervaporative ethanol dehydration, Composite membrane, Bonding layer, Bioadhesive, Guar gum

Hong Wu, Tiantian Zhou, Xianshi Li, Cuihong Zhao, Zhongyi Jiang. Enhancing the separation performance by introducing bioadhesive bonding layer in composite pervaporation membranes for ethanol dehydration[J]. , 2015, 23(2): 372-378.

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Enhancing the separation performance by introducing bioadhesive bonding layer in composite pervaporation membranes for ethanol dehydration

Enhancing the separation performance by introducing bioadhesive bonding layer in composite pervaporation membranes for ethanol dehydration

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