초록 ▼

A non-homogeneous adsorbent is described, formed of a core and at least one continuous outer layer in which the core of said adsorbent has a volume adsorptive capacity representing at least 35% of the volume of the adsorbent and the outer layer has a diffusional selectivity greater than 5. The adsor

A non-homogeneous adsorbent is described, formed of a core and at least one continuous outer layer in which the core of said adsorbent has a volume adsorptive capacity representing at least 35% of the volume of the adsorbent and the outer layer has a diffusional selectivity greater than 5. The adsorbent is used in gas-separation processes or liquid-separation processes.

대표청구항 ▼

The invention claimed is: 1. A crystalline non-homogeneous adsorbent comprising a zeolitic crystalline core having a size between 0.2 and 50 μm combined with at least one crystalline zeolitic continuous outer layer having a thickness between 0.1 μm and 100 μm wherein the core of said

The invention claimed is: 1. A crystalline non-homogeneous adsorbent comprising a zeolitic crystalline core having a size between 0.2 and 50 μm combined with at least one crystalline zeolitic continuous outer layer having a thickness between 0.1 μm and 100 μm wherein the core of said adsorbent has a volume adsorptive capacity representing at least 35% of the volume of the adsorbent and the outer layer has a diffusional selectivity greater than 5, said core having a diffusional selectivity lower than that of the outerlayer, and wherein said core and said outer layer are compositionally different. 2. A crystalline non-homogeneous adsorbent according to claim 1, wherein the volume adsorptive capacity of the core represents at least 40% of the volume of the adsorbent. 3. A crystalline non-homogeneous adsorbent according to claim 1, wherein the diffusional selectivity of the outer layer is greater than 10. 4. A crystalline non-homogeneous adsorbent according to claim 1, wherein the adsorptive capacity of the core is greater than that of the continuous outer layer. 5. A crystalline non-homogeneous adsorbent according to claim 1, wherein the continuous outer layer has a thickness between 0.1 and 10 μm. 6. A crystalline non-homogeneous adsorbent according to claim 1 in spherical or cylindrical form. 7. A crystalline non-homogeneous adsorbent according to claim 6, wherein the radius of the core represents at least 40% of the total radius of the adsorbent. 8. A gas-or vapour-separation process comprising passing a multicomponent gas through a zone comprising the crystalline non-homogeneous adsorbent according to claim 1. 9. A liquid-separation process comprising passing a multicomponent gas through a zone comprising the crystalline non-homogeneous adsorbent according to claim 1. 10. A crystalline non-homogeneous adsorbent according to claim 1, wherein the core comprises a faujasite structural type zeolite and the outer layer comprises an MFI structural type zeolite. 11. A crystalline non-homogeneous adsorbent according to claim 10, wherein the faujasite structural type zeolite comprises zeolite X and the MFI structural type zeolite comprises silicalite-1. 12. A gas separation process comprising passing a multi component gas through a zone comprising the crystalline non-homogeneous adsorbent according to claim 10. 13. A process according to claim 12, wherein said gas comprises mono-branched paraffins and di-branched paraffins. 14. A crystalline non-homogeneous adsorbent according to claim 1, produced by first preparing a solid zeolite core and next preparing a dispersion of a second zeolite for the outer layer and adhering particles of said outer layer zeolite to said core zeolite. 15. A process for producing the crystalline non-homogeneous zeolitic adsorbents according to claim 1, comprising preparing a solid core of a first zeolite and a dispersion of nano particles of a second zeolite, and contacting said dispersion with said solid core so as to adhere particles of said second zeolite onto said first zeolite. 16. A crystalline non-homogeneous adsorbent according to claim 1, wherein the core of the adsorbent has a negligible diffusional resistance.