Helium recovery from higher helium content streams

Details Helium recovery from higher helium content streams Helium recovery from higher helium content streams

C - Chemistry, Metallurgy

01

B

C01B 23/00 (2006.01)

Patent

CA 2205700

The present process is directed to the efficient recovery of helium gas from gasstreams which contain about 25 percent by volume or more helium. The process comprises two stages of pressure swing adsorption, each stage being comprised of a plurality of interconnected adsorbent beds. In the first stage of pressure swingadsorption which is comprised of about five phases, the helium content of the gas stream is increased to 95 percent by volume or more. A secondary product gas stream from the first stage of pressure swing adsorption is fed to the second stage of pressure swing adsorption. The second stage of pressure swing adsorption increases the helium content of this primarily non-helium product gas to more than about 50 percent by volume. This gas now with a helium content of more than about 50 percent by volume is fed along with the gas stream as the input gas to the first stage of pressure swing adsorption.

Récupération efficace d'hélium de courants gazeux contenant environ 25 pourcent ou plus en volume d'hélium. Le procédé comprend deux étapes d'adsorption modulée en pression, chaque étape comprenant plusieurs lits adsorbants interconnectés. Dans la première étape d'adsorption modulée en pression qui comprend environ cinq phases, la teneur en hélium du courant gazeux est augmentée à 95 pourcent ou plus en volume. Un courant gazeux d'un produit secondaire de la première étape est introduit à la deuxième étape de l'adsorption modulée en pression. La deuxième étape de l'adsorption modulée en pression augmente la teneur en hélium de ce gaz, constitué essentiellement d'un gaz autre que l'hélium, à plus de 50 pourcent en volume. Ce gaz à teneur en hélium maintenant de plus de 50 pourcent en volume est introduit avec le courant gazeux en tant que gaz d'entrée à la première étape de l'adsorption modulée en pression.

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