Novel purification method of commercial o- and m-xylenes by shape selective adsorption on HZSM-5 |
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| Institution: | 1. Department of Computational Biophysics and Bioinformatics, Jagiellonian University, Krakow, Poland;2. Department of Radioligands, Jagiellonian University, Krakow, Poland;3. Department of Crystal Chemistry and Crystal Physics, Jagiellonian University, Krakow, Poland |
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| Abstract: | Liquid-phase competitive adsorption of three xylene isomers on ZSM-5 zeolites was studied. HZSM-5 zeolites exhibited an extremely high para-selectivity, this para-selectivity decreased with increasing adsorption temperatures. The introduction of Na+ enhanced the para-selectivity. It is apparent that such a high para-selectivity is caused solely by thermodynamic shape selectivity. The complete removal of impurities with small molecular dimensions, such as p-xylene and benzene, from commercial o- and m- xylenes could be attained by the repetition of the shape-selective adsorption on HZSM-5 zeolites. |
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