L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des

Liquid Air Engineering Corporation

Teisan, K.k.

Sophie Gastinne

Francois Venet

Bao V Ha

Naohiko Yamashita

Maurice Grenier

Pierre Petit

An air separation process wherein a nitrogen enriched fraction is withdrawn from the distillation column, a portion of which is compressed and recycled through the lowest positioned reboiler in the column and directed to an upper portion of the column as reflux.

Process for the production of nitrogen by cryogenic distillation of

A process for producing gaseous nitrogen from a mixture to be treated in a distillation column, said mixture comprising nitrogen and oxygen, said process comprising the steps of:

According to this process, compressed air is cooled and purified by adsorption by passing same in a first direction through a mass of adsorbent material (8), then a residual gas from the distillation apparatus passes in opposite direction through this mass to regenerate same. During the entire regeneration, the residual gas is at a constant regeneration temperature which is between the temperature of the air entering into the mass of adsorbent material and at a temperature which is about 50.degree. C. above this temperature.

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Notre Dame de Gravencho, France

Sophie Gastinne