초록 ▼

A process for separating a feed gas into at least one product gas includes: (a) providing a gas separation apparatus with at least one adsorption layer including a lithium-exchanged FAU adsorbent having water desorption characteristics, defined by drying curves, similar to those for the correspondin

A process for separating a feed gas into at least one product gas includes: (a) providing a gas separation apparatus with at least one adsorption layer including a lithium-exchanged FAU adsorbent having water desorption characteristics, defined by drying curves, similar to those for the corresponding fully sodium-exchanged FAU, a heat of adsorption for carbon dioxide equal to or lower than that for the corresponding fully sodium-exchanged FAU at high loadings of carbon dioxide, and onto which the adsorption layer water and/or carbon dioxide adsorb; (b) feeding into the gas separation apparatus a feed gas including nitrogen, oxygen, and at least one of water and carbon dioxide; and (c) collecting from a product end of the gas separation apparatus at least one product gas containing oxygen.

대표청구항 ▼

1. A process for separating a feed gas into at least one product gas, said process comprising:providing a gas separation apparatus comprising at least one adsorption layer comprising a lithium-exchanged FAU adsorbent having water desorption characteristics, defined by drying curves, similar to those

1. A process for separating a feed gas into at least one product gas, said process comprising:providing a gas separation apparatus comprising at least one adsorption layer comprising a lithium-exchanged FAU adsorbent having water desorption characteristics, defined by drying curves, similar to those for the corresponding fully sodium-exchanged FAU, and having a heat of adsorption for carbon dioxide equal to or lower than that for the corresponding fully sodium-exchanged FAU at high loadings of carbon dioxide, wherein said lithium-exchanged FAU adsorbent contains less than 0.01% calcium and less than 0.01% magnesium;feeding into said gas separation apparatus said feed gas comprising nitrogen, oxygen, and at least one of carbon dioxide and water;adsorbing water and/or carbon dioxide onto said at least one adsorption layer; andcollecting from said gas separation apparatus said at least one product gas comprising oxygen. 2. The process of claim 1, wherein said FAU adsorbent has a Si/Al ratio between 1.0 and 1.3. 3. The process of claim 2, wherein said adsorbent has a lithium exchange level of more than 67%. 4. The process of claim 3, wherein said adsorbent is LiLSX. 5. The process of claim 3, wherein said adsorbent is LiMLSX, wherein M represents one or more elements selected from alkaline, alkaline-earth, transition metals and rare-earth groups. 6. The process of claim 1, wherein said at least one product gas contains at least 85% oxygen. 7. The process of claim 1, wherein said gas separation apparatus has a radial flow bed configuration. 8. The process of claim 1, wherein said gas separation apparatus has a cross flow configuration. 9. The process of claim 1, wherein said process comprises adsorbing water from said feed gas onto said at least one adsorption layer, and a productivity of said process for producing said product gas diminishes as a function of an amount of water adsorbed more slowly than a reference productivity of a reference process identical to said process but for use of a lithium-exchanged FAU adsorbent containing at least 0.01% calcium and/or at least 0.01% magnesium. 10. The process of claim 9, wherein the feed gas has a relative humidity greater than 70%.