Process for refining nitrogen trifluoride gas using alkali earth metal exchanged zeolite 4A

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The present invention refers to method relates to pyridinium methylcephem compound, than on-earth metal is ion exchanged with 150 ∼ 600 °C ∼ 100 ingredient 30 in heating at a processing zeolite 4A it buys the fire anger carbon the through a column a charging a (CF 4) pyridinium methylcephem containing (NF 3) by by venting of the gas, pyridinium methylcephem including the selectively adsorbed only pyridinium methylcephem compound relates to method.