| abstract |
The present invention relates to a zeolite adsorbent based on zeolite X and an inert binder, wherein the Si / Al ratio is 1.15 < Si / Al < 1.5, wherein at least 90% of the exchangeable cation sites of the zeolite X are barium ions alone or barium ions And potassium ion, and its Dubinin volume is 0.240 cm 3 / g or more. The adsorbent can be obtained by coagulating the zeolite powder with the binder, then zeolizing the binder, then exchanging the zeolite ion with barium (and potassium) ions, and then activating the resulting exchanged adsorbent. Said adsorbents are useful not only for adsorbing para-xylene contained in the liquid C 8 aromatic hydrocarbon fraction, but also for separating sugar, polyhydric alcohols, cresols and substituted toluene isomers, especially in processes of similar mobile phase. |