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High flux and ultra-thin PDMDES/PVDF composite membrane for alcohols recovery from aqueous solution by pervaporation
  • +3
  • Xiaole Chen,
  • Na Li,
  • Panfeng Liu,
  • Du Wen,
  • Qulan Zhou,
  • Huang Zhong
Xiaole Chen
Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering
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Na Li
Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering
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Panfeng Liu
Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering
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Du Wen
Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering
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Qulan Zhou
Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering

Corresponding Author:[email protected]

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Huang Zhong
Tsinghua University Key Laboratory for Thermal Science and Power Engineering
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Abstract

Pervaporation (PV) of membrane separation technology has become an efficient approach to separate alcohols from aqueous solution. In this study, focusing on breaking the trade-off in PV and enhancing alcohols recovery, an ultra-thin and high flux poly-Dimethyldiethoxysilane (PDMDES) / poly (vinylidene fluoride) (PVDF) composite membrane was prepared. By employing various means, the characterizations of PDMDES/PVDF composite membrane were extensively investigated and the promising results indicated the high hydrophobicity and good affinity to alcohols. To be specific, PDMDES selective layer with different thicknesses, the thinnest of which was approximate 265 nm, were fabricated, and the better PV performance can be achieved in a thickness range of 1.1~1.69 μm. The optimal PV performance of PDMDES/PVDF composite membrane was obtained in separating methanol from 5 wt% methanol/water solution at 40 ℃, resulting in a greatly high total permeation flux of 5375.5 g∙m-2 h-1 and a separation factor of 3.466.