来瓦希尔骨架材料MIL-53(Al)填充PEBA膜渗透汽化分离水中苯胺

doi:10.16085/j.issn.1000-6613.2019-1448

摘要/Abstract

摘要：

将来瓦希尔骨架材料MIL-53(Al)引入到聚醚共聚酰胺（PEBA-2533）高分子相中制备了不同填充量的PEBA/MIL-53(Al)杂化膜并用于渗透汽化分离水中微量苯胺。X-射线衍射结果证实MIL-53(Al)被成功合成。扫描电镜和激光粒度分析结果表明所制备MIL-53(Al)颗粒粒径在纳米尺度范围内。采用扫描电镜、红外光谱、X-射线衍射、差示扫描量热和水接触角对杂化膜进行了表征，并考察了杂化膜的溶胀行为和分离性能。结果表明，所得杂化膜的热稳定性较好。当MIL-53(Al)质量分数小于20%时，MIL-53(Al)在高分子相中分散均匀，继续增大填充量出现团聚现象。杂化膜的结晶度随MIL-53(Al)填充量的增加而降低。MIL-53(Al)的引入增强了杂化膜的疏水性和溶胀度。在料液温度为60℃、膜下游压力400Pa、料液苯胺质量分数为3.6%时，MIL-53(Al)质量分数为20%的杂化膜（M-20）综合分离性能最优，渗透通量达到2.15kg/(m²·h)，分离因子为264。12天的稳定性测试结果表明所得杂化膜分离性能无显著变化，能够满足渗透汽化应用要求。

关键词: 膜, 分离, 渗透汽化, 杂化, 制备, 苯胺

Abstract:

Lavoisier framework MIL-53(Al) was incorporated into the polyether block amide (PEBA-2533) to prepare PEBA/MIL-53(Al) hybrid membranes with different loadings and to be used for pervaporation separation of aniline from water. X-ray diffraction results confirmed that MIL-53(Al) was successfully synthesized. The results of scanning electron microscopy and laser particle size analysis showed that the particle size of MIL-53(Al) was in the nano-scale range. The hybrid membranes were characterized by scanning electron microscopy, infrared spectroscopy, X-ray diffraction, differential scanning calorimetry and water contact angle. The swelling behavior and separation performance of the hybrid membranes were also investigated. The results indicated that the hybrid membranes demonstrated good thermal stability. When the mass fraction of MIL-53(Al) was less than 20%, MIL-53(Al) was evenly dispersed in the polymer phase, and agglomeration occured when the loading amount continued to increase. The crystallinity of hybrid membranes decreased with the increase of MIL-53(Al) loading. The introduction of MIL-53(Al) enhanced the hydrophobicity and swelling of the hybrid membranes. When the feed temperature was 60 ℃, the downstream pressure was 400 Pa and the mass fraction of aniline was 3.6%, the hybrid membrane (M-20) with MIL-53(Al) mass fraction of 20% exhibited the best comprehensive separation performance. The permeation flux reached to 2.15 kg/(m²·h) and the separation factor was high as 264. The long-term test results for 12 days showed that the separation performance of the hybrid membranes had no significant change and can meet the requirements of pervaporation application.

Key words: membranes, separation, pervaporation, hybrid, preparation, aniline

中图分类号:

TQ028.8

韩光鲁, 陈哲, 张永辉, 蔡立芳. 来瓦希尔骨架材料MIL-53(Al)填充PEBA膜渗透汽化分离水中苯胺[J]. 化工进展, 2020, 39(6): 2345-2353.

Guanglu HAN, Zhe CHEN, Yonghui ZHANG, Lifang CAI. Lavoisier framework MIL-53(Al) incorporated PEBA membranes for pervaporation separation of aniline from water[J]. Chemical Industry and Engineering Progress, 2020, 39(6): 2345-2353.

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