SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 64 ›› Issue (12): 26-36.DOI: 10.1016/j.cjche.2023.06.007

• Full Length Article • 上一篇    下一篇

Influence of water vapor on the separation of volatile organic compound/nitrogen mixture by polydimethylsiloxane membrane

Yifan Liang1,2, Haibo Lei3, Xinlei He1, Haoli Zhou1,4, Wanqin Jin1   

  1. 1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
    2. Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
    3. College of Basic Science, Tianjin Agricultural University, Tianjin 300392, China;
    4. Zhangjiagang Institute of Nanjing Tech University, Suzhou 215699, China
  • 收稿日期:2023-03-24 修回日期:2023-06-01 出版日期:2023-12-28 发布日期:2024-02-05
  • 通讯作者: Haoli Zhou,E-mail:zhouhl@njtech.edu.cn
  • 基金资助:
    This work was supported by the National Key Research and Development Program of China (2021YFC2101201, 2022YFB3805203), the National Natural Science Foundation of China (22278208).

Influence of water vapor on the separation of volatile organic compound/nitrogen mixture by polydimethylsiloxane membrane

Yifan Liang1,2, Haibo Lei3, Xinlei He1, Haoli Zhou1,4, Wanqin Jin1   

  1. 1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
    2. Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
    3. College of Basic Science, Tianjin Agricultural University, Tianjin 300392, China;
    4. Zhangjiagang Institute of Nanjing Tech University, Suzhou 215699, China
  • Received:2023-03-24 Revised:2023-06-01 Online:2023-12-28 Published:2024-02-05
  • Contact: Haoli Zhou,E-mail:zhouhl@njtech.edu.cn
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2021YFC2101201, 2022YFB3805203), the National Natural Science Foundation of China (22278208).

摘要: In the industrial treatment of waste volatile organic compound (VOC) streams by membrane technology, a third impurity, generally, water vapor, coexists in the mixture of VOC and nitrogen or air, and can affect membrane performance and the design of the industrial process. This study focused on the investigation of the effect of water vapor on the separation performance of the separation of VOC/water/nitrogen mixtures by a polydimethylsiloxane (PDMS) membrane. Three types of VOCs: water-miscible ethanol, water-semi-miscible butanol, and water-immiscible cyclohexane, were selected for the study. Different operating parameters including, concentration of the feed VOC, feed temperature, and concentration of the feed water were compared for the separation of binary and ternary VOC/nitrogen mixtures. The interaction between the VOC and water was analyzed to explain the transportation mechanism after analyzing the difference in the membrane performance for the separation of binary and ternary mixtures. The results indicated that the interaction between the VOC (or nitrogen) and water is the key factor affecting membrane performance. Water can promote the permeation of hydrophilic VOC but prevent hydrophobic VOC through the membrane for the separation of ternary VOC/water/nitrogen mixtures. These results will provide fundamental insights for the design of the recovery application process for industrial membrane-based VOCs, and also guidance for the investigation of the separation mechanism in vapor permeation.

关键词: Water vapor, Ternary mixtures, Polydimethylsiloxane, Membranes, Permeability, Selectivity

Abstract: In the industrial treatment of waste volatile organic compound (VOC) streams by membrane technology, a third impurity, generally, water vapor, coexists in the mixture of VOC and nitrogen or air, and can affect membrane performance and the design of the industrial process. This study focused on the investigation of the effect of water vapor on the separation performance of the separation of VOC/water/nitrogen mixtures by a polydimethylsiloxane (PDMS) membrane. Three types of VOCs: water-miscible ethanol, water-semi-miscible butanol, and water-immiscible cyclohexane, were selected for the study. Different operating parameters including, concentration of the feed VOC, feed temperature, and concentration of the feed water were compared for the separation of binary and ternary VOC/nitrogen mixtures. The interaction between the VOC and water was analyzed to explain the transportation mechanism after analyzing the difference in the membrane performance for the separation of binary and ternary mixtures. The results indicated that the interaction between the VOC (or nitrogen) and water is the key factor affecting membrane performance. Water can promote the permeation of hydrophilic VOC but prevent hydrophobic VOC through the membrane for the separation of ternary VOC/water/nitrogen mixtures. These results will provide fundamental insights for the design of the recovery application process for industrial membrane-based VOCs, and also guidance for the investigation of the separation mechanism in vapor permeation.

Key words: Water vapor, Ternary mixtures, Polydimethylsiloxane, Membranes, Permeability, Selectivity