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US 5,507,957 AGranted
Treating materials with ozone
OwnerMichael E. Garrett, John R. Coatesinventors
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Abstract
A method of treating a material with ozone including the steps of passing oxygen rich gas from a PSA plant 2 through an ozonizer 4 and then passing the ozonized oxygen thus formed directly back to the PSA plant where the ozone is adsorbed in a bed of silica gel contained within a vessel. During the desorption step nitrogen adsorbed in a bed of zeolite also located in the vessel desorbs the ozone from the bed of silica gel and a nitrogen-ozone gas leaves the PSA plant via a line in the feed end. The material is treated with the nitrogen-ozone gas.
Claims5
A method of treating a material with ozone comprising:
- (a) passing ozonized oxygen through a first bed of adsorbent material located in a vessel forming part of a pressure swing adsorption plant, thereby preferentially adsorbing ozone and producing a non-adsorbed oxygen-rich gas;
- (b) passing said nonadsorbed oxygen-rich gas and air through a second bed of adsorbent, thereby adsorbing nitrogen from said air and producing an oxygen-rich product stream;
- (c) desorbing nitrogen from said second bed of adsorbent and ozone from said first bed of adsorbent;
- (d) combining the desorbed nitrogen and desorbed ozone from step (c);
- and
- (e) contacting the combined ozone-nitrogen gas with said material.
3 more elements
Dependencies are inferred from the claim text.