Preparation and characterization of inner-pressure hollow fiber composite membrane via two-way coating technique for CO₂/CH₄ separation

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• 作者：Hongbin Li ; Wenying Shi ; Yuheng Su ; Qiyun Du ; Hongying Zhu…
• 关键词：Poly(vinylamine) ; Hollow fiber ; Composite membrane ; Two ; way coating ; CO2/CH4 separation
• 刊名：Fibers and Polymers
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：17
• 期：10
• 页码：1558-1568
• 全文大小：1,630 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  
• 出版者：The Korean Fiber Society
• ISSN：1875-0052
• 卷排序：17

文摘

High-selectivity inner-pressure hollow fiber composite (HFC) membrane for CO₂/CH₄ separation was prepared through the Two-way coating (TWC) technique. The blends of poly(vinylamine) (PVAm)/polyvinyl alcohol (PVA) were coated onto porous hollow fiber polysulfone (PSF) ultrafiltration (UF) membrane with an effective membrane area of 0.4 m2. The effects of fabrication parameters on the permselectivity of the resultant HFC membrane were investigated and the optimum preparation conditions were obtained as follows: coating time for 30 min and air blowing time for 30 min after the coating. The prepared HFC membrane showed the typical characteristic of fixed carrier membrane with a high selectivity of CO₂ and CH₄: the separation factor of CO₂/CH₄ (40 vol% CO₂ at 25 °C and 0.2 MPa) was 36.6 and the CO₂ permeability was 56.3 GPU. Field emission scanning electron microscopy (FESEM) images indicated that the HFC membrane prepared by TWC technique had a uniform coating layer along the whole hollow fiber. Membrane permselectivity showed almost no difference between different membrane sections. The HFC membrane showed a good stability during the continuous testing process of 540 h. And the HFC membrane preserved at 30 °C and 40 % humidity exhibited a good durability with a basically unchanged separation factor after 30 days.