Method and apparatus for gas purification
AssigneePraxair Technology, Inc.
InventorsMark William Ackley, Himanshu Saxena, Gregory William Henzler, Jeffert John Nowobilski
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Abstract
This invention comprises an adsorption process for the removal of at least N2O from a feed gas stream that also contains nitrogen and possibly CO2 and water. In the process the feed stream is passed over adsorbents to remove impurities such as CO2 and water, then over an additional adsorbent having a high N2O/N2 separation factor. In a preferred mode the invention is an air prepurification process for the removal of impurities from air prior to cryogenic separation of air. An apparatus for operating the process is also disclosed.
Claims21
An adsorption purification process for the removal of N2O from a gas containing less than 100 ppm of N2O, nitrogen and other components, said process comprising passing said gas over a bed of one or more adsorbents and producing a purified gas, wherein said one or more adsorbents is selected from the group consisting of clinoptilolite, chabazite and Li-exchanged zeolite.
A process for the separation of N2O from a gas stream containing at least N2O and nitrogen, wherein the concentration of N2O is less than 100 ppm, said process comprising passing said gas stream over a bed of adsorbent having a ΔN2O working capacity of greater than or equal to 3.56×10−4 at IBL.
An adsorption apparatus for the removal of N2O from a gas containing N2O, nitrogen and other components, said apparatus comprising one or more beds of at least a first adsorbent, wherein said first adsorbent is an N2O selective adsorbent selected from the group consisting of clinoptilolite, chabazite and Li-exchanged zeolite or combinations thereof, wherein said apparatus comprises a layer of alumina and a mixed layer of said N2O selective adsorbent and an adsorbent selective for CO2 downstream of said layer of alumina.
An adsorption apparatus for the removal of N2O from a gas containing N2O, nitrogen and other components, said apparatus comprising one or more beds of at least a first adsorbent, wherein said first adsorbent is an N2O selective adsorbent selected from the group consisting of clinoptilolite, chabazite and Li-exchanged zeolite or combinations thereof, wherein said apparatus comprises a layer of alumina and, downstream therefrom, a layer of a composite material comprising said N2O selective adsorbent and an adsorbent selective for CO2 bound into a single particulate material.
Dependencies are inferred from the claim text.