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The purification process takes crude (55%) low pressure NF₃ from the production facility, passes the gas through an adsorber bed to remove water, CO₂ and NO_x. The gas is compressed and fed to the distillation cold box (above) where the NF₃ is liquefied. Two distillation columns remove light and heavy contaminants. Three day tanks store the purified liquid (99.997%) NF₃.  The liquid is then vaporized and compressed for filling into cylinders, ton containers and ISO trailers.  EGS engineered and designed the entire purification system. The cold box was fabricated in the US, the remaining components were built in South Africa under EGS supervision.