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Direct Separation of para-Xylene from Xylene Isomers by a Zinc Bipyrazolate Framework
Jia-Qi He1, Wen-Bin Li1, Hao Zhuo1
1MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China.
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Separation of xylene isomers is an important challenge for the chemical industry. Here, we report a new zinc bipyrazolate framework MAF-70 for the separation of xylene isomers, which contains square pore channels of 8.7× 8.7 Å2. MAF-70 exhibits a rare adsorption preference of ortho-xylene (oX) > meta-xylene (mX) > para-xylene (pX) with high selectivity for oX/pX and mX/pX (12.0 and 4.0, respectively), facilitating direct purification of pX (99.1+% purity) from a xylenes mixture, which is validated by column separation experiments. Modeling study indicates that the restricted diffusion of pX accounts for such separation.
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