An asymmetric membrane of polyimide 6FDA-BDAF and its pervaporation desulfurization for n-heptane/thiophene mixtures

YANG Xiang-dong; YE Hong; LI Yan-ting; LI Juan; LI Ji-ding; ZHAO Bing-qiang; LIN Yang-zheng

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An asymmetric membrane of polyimide 6FDA-BDAF and its pervaporation desulfurization for n-heptane/thiophene mixtures

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Polyimide (PI) is a type of important membrane material. A soluble polymer was synthesized from 4,4´-(hexalfuoroisopro-pylidene) diphthalic anhydride (6FDA) and 2,2-bis[4-(4-aminophenoxy) phenyl] hexalfuoropropane (BDAF) by the two-step polymerization method. The polymer was proved to be polyimide 6FDA-BDAF by the Fourier transform infrared (FT-IR), the1H-NMR and19F-NMR spectra. An asymmetric membrane was prepared with the synthesized polyimide 6FDA-BDAF, it was porous in the 50 μm height bulk and dense in a 3–5 μm height surface. The membrane was used to separate n-hep-tane/thiophene mixtures by pervaporation with sulfur (S) contents from 50 to 900 μg g–1. The total lfux was enlarged from 7.96 to 37.61 kg m–2 h–1 with temperature increasing from 50 to 90°C. The membrane’s enrichments factor for thiophene were about 3.13 and dependent on the experimental conditions. The experimental results demonstrated that polyimide 6FDA-BDAF would be a potential membrane material for desulfurization and controled release of the S-containing fertilizer.

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《农业科学学报（英文版）》 |2015年第12期|2529-2537|共9页
作者
YANG Xiang-dong; YE Hong; LI Yan-ting; LI Juan; LI Ji-ding; ZHAO Bing-qiang; LIN Yang-zheng;
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Institue of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China;

Department of Chemical Engineering, Tsinghua University, Beijing 100084, P.R.China;

Institue of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China;

Institue of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China;

Department of Chemical Engineering, Tsinghua University, Beijing 100084, P.R.China;

Institue of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China;

Department of Chemical Engineering, Tsinghua University, Beijing 100084, P.R.China;

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An asymmetric membrane of polyimide 6FDA-BDAF and its pervaporation desulfurization for n-heptane/thiophene mixtures

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