| 摘要 |
<p>THE PRESENT INVENTION RELATES TO AGGLOMERATED ZEOLITIC ADSORBENTS BASED ON ZEOLITE X WITH AN SI/AL RATIO SUCH THAT 1.15 < SI/ AL < 1.5, AT LEAST 90OF THE EXCHANGEABLE CATIONIC SITES OF THE ZEOLITE X OF WHICH ARE OCCUPIED EITHER BY BARIUM IONS ALONE OR BY BARIUM IONS AND POTASSIUM IONS, WHOSE DUBININ VOLUME IS GREATER THAN OR EQUAL TO 0.240 CM3/G. THE AGGLOMERATED ZEOLITIC ADSORBENTS ACCORDING TO THE PRESENT INVENTION ARE OBTAINED BY AGGLOMERATING ZEOLITE POWDER WITH A BINDER, FOLLOWED BY THE ZEOLITIZATION OF THE BINDER, THE EXCHANGE OF THE IONS OF THE ZEOLITE BY BARIUM IONS (AND OPTIONALLY POTASSIUM IONS) AND THE ACTIVATION OF THE ADSORBENTS THUS EXCHANGED. THESE ADSORBENTS ARE PARTICULARLY SUITED TO THE ADSORPTION OF THE PARA-XYLENE PRESENT IN C8 AROMATIC HYDROCARBON FRACTIONS IN THE LIQUID PHASE IN PROCESSES OF SIMULATED MOVING BED TYPE BUT ALSO TO THE SEPARATION OF SUGARS, POLYHYDRIC ALCOHOLS, CRESOLS OR SUBSTITUTED TOLUENE ISOMERS.</p> |
