College of Materials Science and Engineering, Taiyuan University of Technology

【目的】丙烯(C3H6)是一种重要的烯烃原料,在实际生产中去除其中的丙烷(C3H8)杂质非常重要。金属有机框架材料(metal-organicframeworks,MOFs)对于C3H6和C3H8的分离纯化有着极大的前景,其中C3H8选择性吸附剂可一步获得高纯C3H6产物,有着极高的工业价值。MIL-126(Fe)由于富含的低极性苯环提供了密集的电负性结合位点,对于烷烃的优先吸附有很大潜力。【方法】采用溶剂热法合成了MIL-126(Fe),对其稳定性及C3H8/C3H6吸附分离性能进行了研究。【结果】MIL-126(Fe)有优异的稳定性;298K和1bar下C3H8吸附量为185.37cm3/g,高于大部分C3H8选择性吸附MOFs材料;对C3H8/C3H6混合气体的IAST选择性在0.1bar时为1.44,1bar时为1.23,表明MIL-126(Fe)对C3H6和C3H8混合气体反转吸附,其C3H6回收潜力为19.71cm3/g,接近国内外研究的最高水平。【结论】气体穿透实验结果表明MIL-126(Fe)对于一步获得高纯C3H6有极大的工业应用潜力。

【Purposes】 Propylene is an important olefin raw material, and the removal of pro-pane impurities in it is very important in actual production. Metal-organic frameworks (MOFs) have great prospects for the separation and purification of propane/propylene. Among them, pro-pane-selective adsorbents can be used to obtain high-purity propylene products in one step, which has extremely high industrial value. MIL-126(Fe) has great potential for preferential adsorption of alkanes becaused of the abundant low-polarity benzene rings that provide dense electronegativi-ty binding sites. 【Methods】 MIL-126(Fe) was synthesized through solvothermal method. 【Findings】 The stability, C3H8/C3H6 adsorption, and separation properties of MIL-126(Fe) were studied. The results showed that MIL-126(Fe) had excellent stability. The adsorption capacity of C3H8 at 298 K and 1 bar was 185.37 cm3/g, which was higher than that of most propane-selec-tive adsorption MOFs. The IAST selectivity for C3H8/C3H6 mixture was 1.44 at 0.1 bar and 1.23 at 1 bar. It is showed that MIL-126(Fe) had reverse adsorption on propane-propylene mix-ture, and its propylene recovery potential was 19.71 cm3/g, which was close to the highest level of domestic and international researches. 【Conclusions】 The results of gas breakthrough experi-ments showed that MIL-126(Fe) has great potential for industrial application in one-step produc-tion of high-purity propylene.

山西省揭榜招标项目(20201101016);晋中市科技重点研发计划(Y203012);吕梁市引进高层次科技人才重点研发项目(2021RC-2-17,RC2020-111)

赵璇宇,王德印,王勇,等.金属有机框架材料 MIL-126(Fe)对 C3H8/C3H6 反转吸附分离性能研究[J].太原理工大学学报,2023,54(4):647-654.

ZHAO Xuanyu,WANG Deyin,WANG Yong,et al.Study on C3H8/C3H6 reverse adsorption and separation per-formance of metal-organic framework MIL-126(Fe)[J].Journal of Taiyuan University of Technology,2023,54(4):647-654.