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聚乙烯醇/二氧化硅杂化膜的制备及渗透蒸发分离环己醇(酮)/环己烷

肖佩佩1,2,韩笑颜1,2,曾楚怡 1,2,赵虹1,周继承2,李继定3   

  1. 1中国科学院上海高等研究院,上海 201210;2湘潭大学化工学院,湖南 湘潭 411105;3 清华大学化工系 膜技术与工程研究中心,北京 100084
  • 出版日期:2014-10-05 发布日期:2014-10-05

Pervaporation separation of cyclohexanol (cyclohexanone)/cyclohexane mixture by polyvinyl alcohol(PVA)/silica(SiO2) hybrid membrane

XIAO Peipei 1,2,HAN Xiaoyan 1,2,ZENG Chuyi1,2,ZHAO Hong1,ZHOU Jicheng2,LI Jiding3   

  1. 1Shanghai Advanced Institute,Chinese Academy of Sciences,Shanghai 201210,China;2School of Chemical Engineering,Xiangtan University,Xiangtan 411105,Hunan,China;3Membrane Technology and Engineering Research Center,Department of Chemical Engineering,Tsinghua University,Beijing 100084,China
  • Online:2014-10-05 Published:2014-10-05

摘要: 以聚乙烯醇(PVA)和正硅酸乙酯(TEOS)为原料,经溶胶-凝胶(sol-gel)法制备了不同二氧化硅(SiO2)含量的 PVA/SiO2杂化膜。傅里叶变换红外光谱(FT-IR)表明,随着SiO2含量增大,1060cm?1和970cm?1处Si—O—Si特征吸收峰的相对强度逐渐加强,说明TEOS与PVA发生了交联反应;同时膜的分解温度从248℃升高到342℃。杂化膜的SiO2含量从10 %增大到40 %,其玻璃态温度从115℃升高到124℃。以水为溶剂,测定了杂化膜的耐溶剂性能,与PVA膜相比,杂化膜的耐溶剂性能显著提高。以质量比为0.950/0.025/0.025的环己烷/环己醇/环己酮为原料,测定杂化膜的分离性能,结果表明SiO2含量从10 %增大到40 %,通量从15.94 g/(m2?h)升高到75.69 g/(m2?h),环己醇的分离因子从1.8升高到2.65。

关键词: 膜, 分离, 聚乙烯醇, 二氧化硅, 渗透蒸发

Abstract: Polyvinyl alcohol(PVA) / silica(SiO2) hybrid membranes with various silica contents were prepared with the sol-gel method. Fourier transform infrared (FT-IR) spectra showed that the relative intensities of Si—O—Si characteristic absorption peaks at 1060cm-1 and 970cm-1 gradually increased with increasing SiO2 content,indicating crosslinking reaction between tetraethoxysilane(TEOS)and PVA. Thermal gravimetric analysis (TGA) results showed that breakdown temperature increased from 248℃ to 342℃ along with SiO2 content rising from 0 to 40%. Differential scanning calorimetry (DSC) results showed that glass transition temperatures (Tg) rose from 115℃ to 124℃ with increasing SiO2 content from 10% to 40%. Compared with the PVA membrane,solvent resistance of PVA/SiO2 hybrid membranes was significantly improved in water. Using cyclohexane /cyclohexanol/ cyclohexanone mixture with mass fraction of 0.950/0.025/0.025 as feed,separation performance of the hybrid membrane was determined. Total flux increased from 15.94 to 75.69 g/(m2?h) and selectivity of cyclohexanol increased from 1.8 to 2.65 with increasing SiO2 content from 10% to 40%.

Key words: membrane, separation, polyvinyl alcohol, silica dioxide, pervaporation

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