An asymmetric membrane of polyimide 6FDA-BDAF and its pervaporation desulfurization for n-heptane/thiophene mixtures
文献类型: 外文期刊
第一作者: Yang Xiang-dong
作者: Yang Xiang-dong;Li Yan-ting;Li Juan;Zhao Bing-qiang;Ye Hong;Li Ji-ding;Lin Yang-zheng;Ye Hong;Lin Yang-zheng
作者机构:
关键词: pervaporation;membrane material;fertilizer;desulfurization;n-heptane/thiophene
期刊名称:JOURNAL OF INTEGRATIVE AGRICULTURE ( 影响因子:2.848; 五年影响因子:2.979 )
ISSN: 2095-3119
年卷期: 2015 年 14 卷 12 期
页码:
收录情况: SCI
摘要: Polyimide (PI) is a type of important membrane material. A soluble polymer was synthesized from 4,4 ''-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and 2,2-bis[4-(4-anninophenoxy) phenyl] hexafluoropropane (BDAF) by the two-step polymerization method. The polymer was proved to be polyimide 6FDA-BDAF by the Fourier transform infrared (FT-IR), the 1H-NMR and 19F-NMR spectra. An asymmetric membrane was prepared with the synthesized polyimide 6FDA-BDAF, it was porous in the 50 pm height bulk and dense in a 3-5 pm height surface. The membrane was used to separate n-heptane/thiophene mixtures by pervaporation with sulfur (S) contents from 50 to 900 pg g(-1). The total flux 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 polyinnide 6FDA-BDAF would be a potential membrane material for desulfurization and controlled release of the S-containing fertilizer.
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