Process for refining nitrogen trifluoride gas using mixture of zeolite A

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The present invention refers to method relates to pyridinium methylcephem compound, of an alkaline-earth metal is ion exchange and/or impregnated after heating at a 150 ∼ 600 °C ∼ 100 ingredient 30 in processing zeolite A a charging the mixture of the through a column it buys the fire anger carbon (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.