Ozone recovery by zeolite adsorbents
AssigneeAir Products and Chemicals, Inc.
InventorEdward Landis Weist, Jr.
Life of this patent
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Abstract
Ozone is recovered from an ozone-oxygen mixture by adsorption using an adsorbent which comprises a zeolite selected from the group consisting of L type zeolite, Y type zeolite, ZSM-5, and mordenite in which at least 90% of the exchangeable cation content is in the ammonium form and the molar ratio of potassium to aluminum is less than about 0.25. Alternatively, a proton-exchanged L type zeolite can be used in which at least 90% of the exchangeable cation content is in the proton form and the molar ratio of potassium to aluminum is less than about 0.25.
Claims12
A method for recovering ozone from an ozone-containing gas mixture which comprises contacting the gas mixture with an ozone-selective adsorbent whereby the ozone is selectively adsorbed from the gas mixture, and recovering the ozone by desorption from the adsorbent to yield an ozone-enriched gas product, wherein the adsorbent comprises a zeolite in which at least 90% of the exchangeable cation content is in the ammonium form and the molar ratio of potassium to aluminum is less than about 0.25, and wherein the zeolite is selected from the group consisting of L type zeolite, Y type zeolite, ZSM-5, and mordenite.
A method for recovering ozone from an ozone-containing gas mixture which comprises contacting the gas mixture with an ozone-selective adsorbent whereby the ozone is selectively adsorbed from the gas mixture, and recovering the ozone by desorption from the adsorbent to yield an ozone -enriched gas product, wherein the adsorbent comprises an L type zeolite in which at least 90% of the exchangeable cation content is in the proton form and the molar ratio of potassium to aluminum is less than about 0.25.
An adsorbent for the recovery of ozone from an ozone-containing gas mixture which comprises a zeolite in which at least 90% of the exchangeable cation content is in the ammonium form and the molar ratio of potassium to aluminum is less than about 0.25 wherein the zeolite is selected from the group consisting of L type zeolite, Y type zeolite, ZSM-5, and mordenite.
An adsorbent for the recovery of ozone from an ozone-containing gas mixture which comprises an L type zeolite in which at least 90% of the exchangeable cation content is in the proton form and the molar ratio of potassium to aluminum is less than about 0.25.
Dependencies are inferred from the claim text.