Abstract: The invention relates to zeolitic absorbents based on at least one zeolite with hierarchical porosity, containing barium or barium and potassium, to the uses thereof for separating para-xylene from aromatic fractions containing 8 carbon atoms, and to the method for separating para-xylene from aromatic fractions containing 8 carbon atoms.

Abstract: The present invention relates to a zeolite absorbent comprising at least one FAU zeolite with hierarchical porosity and comprising barium or barium and potassium, and the external surface area of which is greater than 20 m2·g?1, and the non-zeolite phase content being between 6% and 12% by weight with respect to the total weight of the absorbent. The present invention also relates to the use of such a zeolite absorbent as an adsorption agent, as well as the method for separation of para-xylene from aromatic isomer fractions with 8 carbon atoms.

Abstract: Process for separating xylenes starting from a feed comprising cuts of isomers of aromatic hydrocarbons containing 8 carbon atoms, in a simulated moving bed, by selective adsorption of a xylene isomer in the presence of a desorbent, by means of particles of agglomerated zeolitic adsorbent based on zeolite crystals with a number-average diameter less than or equal to 1.2 ?m, wherein the number-average diameter of said particles of adsorbent is between 150 ?m and 500 ?m and the mechanical strength measured by the Shell method series SMS1471-74 adapted for agglomerates with a size below 500 ?m is greater than or equal to 2 MPa.

Abstract: Provided is a zeolite-based adsorbent in the form of agglomerates, where the adsorbent having a tortuosity factor, calculated from the pore distribution determined by mercury intrusion porosimetry, of greater than 1 and less than 3. The adsorbent also has a porosity as determined by mercury intrusion porosimetry of between 25% and 35%. The adsorbent is useful in the field of separations in particular in a process for separating para-xylene from aromatic hydrocarbon isomer fractions containing 8 carbon atoms.

Abstract: The present invention relates to a zeolite material in the form of FAU zeolite nanocrystal aggregates, to the method for preparing said material, to the zeolite agglomerates prepared from said material with a binder, and to the uses of said material and agglomerate as adsorbents for gas-phase or liquid-phase separation operations, and particularly in methods for separating gas or liquid flows.

Abstract: The present invention concerns zeolites with hierarchical porosity having a molar ratio Si/Al of between 1 and 1.4, inclusive, of which the average diameter, as a number, is between 0.1 ?m and 20 ?m, having controlled and optimized crystallinity, and having mesoporosity such that the mesoporous outer surface area is between 40 m2.g?1 and 400 m2.g?1. The present invention also concerns the method for preparing said zeolites with hierarchical porosity.

Abstract: The present invention concerns Y-type FAU zeolites with hierarchical porosity having an Si/Al atomic ratio strictly greater than 1.4 and less than or equal to 6, having controlled and optimised crystallinity, and having mesoporosity such that the mesoporous outer surface area is between 40 m2·g?1 and 400 m2·g?1. The present invention also concerns the method for preparing said Y-type FAU zeolites with hierarchical porosity.

Abstract: The invention relates to a method for separating meta-xylene from C8 aromatic fractions, using a zeolitic adsorbent based on sodium-exchanged or sodium-and-lithium-exchanged agglomerated crystals of zeolite Y, with a large external surface area.

Abstract: The present invention relates to zeolite materials in the form of agglomerates comprising at least one mesoporous Faujasite zeolite with an Si/Al ratio which is strictly greater than 1.4 and having both the characteristics of mesoporous zeolites, the properties associated with microporosity and the mechanical properties of zeolite agglomerates without mesoporous zeolite. The invention also relates to the process for preparing the said zeolite materials in the form of agglomerates.

Abstract: The invention relates to an adsorbent comprising a zeolite-based phase and a non-zeolite-based phase, said adsorbent having: an outer surface area of less than or equal to 30 m2·g?1, preferably less than or equal to 20 m2·g?1, a zeolite-based phase comprising at least one zeolite of FAU structure of X type, and a pore diameter distribution, determined by mercury intrusion according to standard ASTM D 4284-83 and expressed by the volume distribution dV/dlogDHg, in which DHg is the apparent pore diameter and V is the pore volume, the mode of which is between 100 nm and 250 nm, limits inclusive. The invention also relates to a process for preparing the said adsorbent and to the uses thereof, especially for separating xylene isomers.

Abstract: The present invention concerns zeolites with hierarchical porosity having a molar ratio Si/Al of between 1 and 1.4, inclusive, of which the average diameter, as a number, is between 0.1 ?m and 20 ?m, having controlled and optimized crystallinity, and having mesoporosity such that the mesoporous outer surface area is between 40 m2·g?1 and 400 m2·g?1. The present invention also concerns the method for preparing said zeolites with hierarchical porosity.

Abstract: The present invention concerns Y-type FAU zeolites with hierarchical porosity having an Si/Al atomic ratio strictly greater than 1.4 and less than or equal to 6, having controlled and optimised crystallinity, and having mesoporosity such that the mesoporous outer surface area is between 40 m2·g?1 and 400 m2·g?1. The present invention also concerns the method for preparing said Y-type FAU zeolites with hierarchical porosity.

Abstract: The present invention relates to a zeolite adsorbent having an external surface area of between 20 m2·g?1 and 70 m2·g?1, a mesopore volume (Vmeso) of less than or equal to 0.20 cm3·g?1, and a content of non-zeolite phase (NZP) of less than or equal to 6%, and in which at least one of its dimensions is greater than or equal to 30 ?m. The invention also relates to the process for preparing said zeolite materials in agglomerated form and to the uses thereof for gas-phase or liquid-phase separation operations.

Abstract: The present invention relates to zeolite adsorbents based on agglomerated zeolite X crystals comprising barium, potassium and sodium. These adsorbents find applications in the separation of aromatic C8 isomer fractions and especially xylene.

Abstract: The present invention relates to zeolite adsorbents based on agglomerated zeolite X crystals comprising barium, potassium and sodium. These adsorbents find applications in the separation of aromatic C8 isomer fractions and especially xylene.

Abstract: The present invention relates to zeolitic adsorbents based on agglomerated crystals of FAU zeolite containing barium and/or potassium, with large external surface area, combining optimum properties in terms of selectivity and mechanical strength. These adsorbents find applications in the separation of cuts of C8-aromatic isomers and notably of xylenes, in the separation of isomers of substituted toluene such as nitrotoluene, diethyltoluene, toluenediamine, in the separation of cresols, and in the separation of polyhydric alcohols such as sugars.

Abstract: The present invention relates to zeolite materials in the form of agglomerates comprising at least one mesoporous zeolite and having both the characteristics of mesoporous zeolites, the properties associated with microporosity and the mechanical properties of zeolite agglomerates without mesoporous zeolite. The invention also relates to the process for preparing the said zeolite materials in the form of agglomerates.

Abstract: The present invention relates to a zeolite-based adsorbent comprising at least one zeolite of FAU structure of LSX type and comprising barium and/or potassium, in which the outer surface area of said zeolite-based adsorbent, measured by nitrogen adsorption, is between 20 m2·g?1 and 100 m2·g?1, limits inclusive. The present invention also relates to the use of such a zeolite-based adsorbent as an adsorption agent, and also to the process for separating para-xylene from aromatic isomer fractions containing 8 carbon atoms.

Abstract: The present invention relates to zeolitic adsorbents based on agglomerated crystals of FAU zeolite comprising barium and/or potassium, with large external surface area, combining optimum properties in terms of selectivity and mechanical strength. These adsorbents find applications in the separation of cuts of C8-aromatic isomers and notably of xylenes, in the separation of isomers of substituted toluene such as nitrotoluene, diethyltoluene, toluenediamine, in the separation of cresols, and polyhydric alcohols, such as sugars.

Abstract: The present invention concerns the use, for gas separation and/or gas drying, of at least one zeolite adsorbent material comprising at least one type A zeolite, said adsorbent having an external surface area greater than 20 m2.g?1, a non-zeolite phase (PNZ) content such that O<PNZ?30%, and an Si/Al atomic ratio of between 1.0 and 2.0. The invention also concerns a zeolite adsorbent material having an Si/Al ratio of between 1.0 and 2.0, a mesoporous volume of between 0.07 cm3·g?1 and 0.18 cm3·g?1, a (Vmicro-Vmeso)/Vmicro ratio of between ?3 and 1.0, non-inclusive, and a non-zeolite phase (PNZ) content such that 0<PNZ?30%.