Aggregate zeolitic absorbents, their method of preparation and their uses

摘要

The present invention relates to aggregate zeolitic adsorbents based on zeolite X and zeolite LSX.;These adsorbents are particularly suitable for separating C8 aromatic isomers and in particular xylenes, separating sugars, separating polyhydric alcohols, separating isomers of substituted toluenes, separating cresols, separating dichlorobenzenes.

主权项

1. An aggregate zeolitic adsorbent comprising:
zeolite X powder exchanged to at least 90% by barium ions alone or by barium ions and potassium ions, the exchangeable sites representing up to ⅓ of the exchangeable sites occupied by the barium plus potassium ions, remaining sites being occupied by alkali or alkaline-earth ions other than barium and potassium, zeolite LSX powder exchanged to at least 90% by barium ions alone or by barium ions and potassium ions, the exchangeable sites representing up to ⅓ of the exchangeable sites occupied by the barium plus potassium ions, remaining sites being occupied by alkali or alkaline-earth ions other than barium and potassium, wherein the molar ratio of the zeolite LSX concentration to the zeolite X concentration is between 0.1 and 10; and a binder in a proportion lower than or equal to 20% by weight of the total weight of the aggregate zeolitic adsorbent.