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AssigneeArkema France
InventorsJullian Vittenet, Guillaume Ortiz, Serge Nicolas, Ludivine Bouvier, Cécile Lutz
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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 0<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%.
A process for separation of oxygen gas components and nitrogen gas components from an oxygen/nitrogen gas mixture, wherein the process comprises:
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Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g.…: by…
Drying gases or vapours: by adsorption
Alumino-silicates: natural alumino-silicates, e.g. zeolites
Synthetic zeolitic molecular sieves: chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the…
About 10 years 5 months of term left · ends 21 Mar 2037 (estimated)
This patent application is a U.S. National Phase Patent Application of PCT Application No. PCT/FR2016/050198, filed Jan. 29, 2016, which claims priority to French Patent Application No. 1550783, filed Feb. 2, 2015, each of which is incorporated by reference herein in its entirety for all purposes.
The invention relates to the use of zeolite adsorbent materials in agglomerated form comprising at least one type-A zeolite, said adsorbents having a high external surface area characterized by nitrogen adsorption, and a high micropore volume, for gas phase separation, in particular in pressure swing processes, either of PSA (pressure swing adsorption) type, or of VSA (vacuum swing adsorption) type, or of VPSA (hybrid process of the previous two), or of RPSA (rapid pressure swing adsorption) type, in temperature swing processes of TSA (temperature swing adsorption) type and/or in pressure and temperature swing processes of PTSA (pressure and temperature swing adsorption) type.
The present invention also relates to a process for gas separation and purification using said zeolite adsorbents having a high external surface area.
FIG. 1 is a schematic diagram of an embodiment of the invention; and
FIG. 2 is a graph showing the oxygen content of a gas stream as a function of desorption time for an embodiment of the invention and for a comparative example.
In the present description, the term “type-A zeolite” denotes an LTA zeolite. According to one preferred embodiment, the type-A zeolite is a mesoporous A zeolite chosen from 3A, 4A and 5A zeolites. The term “3A” is intended to mean a zeolite of which the pore opening is equal to approximately 3 Å; the term “4A” is intended to mean a zeolite of which the pore opening is equal to approximately 4 Å; and the term “5A” is intended to mean a zeolite of which the pore opening is equal to approximately 5 Å.
According to one embodiment of the invention, the zeolite adsorbent material can also comprise one or more other zeolite(s) chosen from FAU zeolites (LSX, MSX, X, Y), LTA zeolites, CHA zeolites (chabazite), HEU zeolites (clinoptilolite), and mixtures of two or more of them, and more preferably from 3A, 4A and 5A zeolites, and mixtures of two or more of them.
Other zeolites may be present in minor amounts in the adsorbents of the invention or usable in the process of the invention. These zeolites can be considered to be pollutants, in particular because they do not contribute to gas adsorption, in other words they are inert with respect to gas adsorption. By way of nonlimiting examples, these zeolites comprise sodalite, hydroxysodalite, zeolite P, and other zeolites that are inert with respect to gas adsorption.