Agglomerated zeolitic adsorbents, their method of preparation and their uses
US8530367B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 13, 2007 |
| Grant date | Sep 10, 2013 |
| Priority date | — |
| Expiry date | Jan 25, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/186
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
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, consisting of crystals with a mean diameter of 1.7 mm or less and of an inert binder, at least 90% of the exchangeable cationic sites of the zeolite X being occupied by barium ions. They may be obtained by agglomerating a zeolite X powder having a mean diameter of 1.7 mm or less with a binder, followed by zeolitization of the binder, exchange of the zeolite ions with barium (and potassium) ions and activation of the adsorbents thus exchanged. These adsorbents exhibit, simultaneously, excellent selectivity, reduced mass transfer resistance and excellent mechanical strength and are particularly suitable for the adsorption of the paraxylene contained in C8 aromatic hydrocarbon fractions in liquid phase in processes of the simulated moving bed type and especially for the separation of paraxylene of C8 aromatic hydrocarbon fractions by adsorption, but also for the separation of sugars, polyhydric alcohols, cresols, and substituted toluene isomers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.