Patent ID: 7744836
Filing Date: 2010-06-29
Classification: B01D,C01B

Abstract:
1. A gas purifying process for removing trace constituents from a mixed gas containing a rare gas selected from at least one of krypton or xenon and nitrogen as main components; and hydrogen, reaction products containing both nitrogen and hydrogen, water vapor and nitrogen oxides as said trace constituents, the process consisting of the steps of: (1) a denitration step for converting the nitrogen oxides into nitrogen and water vapor by means of a catalytic denitration reaction in the presence of ammonia which is a reducing substance; (2) an adsorbing step for removing water vapor and reaction products containing both nitrogen and hydrogen from the mixed gas which has gone through said denitration step by using potassium ion-exchanged A-type zeolite as an adsorbent; (3) a hydrogen oxidation step for converting the hydrogen present in the mixed gas which has gone through said adsorbing step into water vapor by means of a hydrogen oxidation catalytic reaction in the presence of oxygen; and (4) a drying step for removing water vapor generated in said hydrogen oxidation step by using potassium ion-exchanged A-type zeolite as an adsorbent.