Nitrogen scrubbing with metal

In brief, the procedure consists of passing sulfur(IV) oxide, diluted with an inert gas, through a metal or glass tube packed with silver(II) fluoride. The product is collected in a glass trap cooled with liquid nitrogen. Purification is effected either by scrubbing the crude product with an aqueous solution of potassium iodide or by distillation at atmospheric pressure. 

Disposal of nitrogen trifluoride can be accomplished by combustion with a fuel such as activated charcoal, hydrocarbons, or metals at elevated temperatures. Reactions with activated charcoal produce nitrogen and carbon tetrafluo-ride. Carbon bed temperatures must be maintained above 1202°F (650°C) to assure reaction and to prevent gas adsorption. Similarly, nitrogen trifluoride streams can be scrubbed by introducing the gas through a packed bed of metals or metal oxides maintained at above 1000°F (538°C), followed by caustic scrubbing. 

---