Hybrid air seperation method with noncryogenic preliminary...

B - Operations – Transporting – 01 – D

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B01D 53/26 (2006.01) B01D 53/02 (2006.01)

Patent

CA 2728244

Large quantities of high purity and high pressure nitrogen or oxygen gas are produced using a portable system. A PSA, VSA, TSA, or permeable membrane system cleans the air of water and carbon dioxide, as normally required by the cryogenic distillation cycle, but additionally, a significant amount of the oxygen or nitrogen is also removed, depending on the desired produced gas. The removal of the oxygen or nitrogen before the cryogenic process permits the distillation column to be signifi-cantly shorter than would otherwise be required. This in turn reduces the size of the equipment such that it can easily be transport-ed and setup. Additionally, a high pressure liquid pump is used to boost the pressure of the nitrogen or oxygen immediately before it goes through the last pass of the cryogenic heat exchanger where the liquid is vaporized and the incoming gas is cooled.

L'invention porte sur un système portable qui permet de produire de grandes quantités d'un gaz azote ou oxygène de grande pureté à haute pression. Selon l'invention, un système PSA, VSA, TSA ou à membrane perméable nettoie l'air en éliminant l'eau et le dioxyde de carbone, comme cela se fait normalement lors d'un cycle de distillation cryogénique, mais en élimine aussi une quantité significative d'oxygène ou d'azote, en fonction du gaz produit désiré. L'élimination de l'oxygène ou de l'azote préalablement au processus cryogénique permet d'utiliser une colonne de distillation significativement plus courte que d'ordinaire, entraînant une réduction de la taille de l'équipement qui rend ce dernier facile à transporter et à installer. On utilise en outre une pompe à liquide à haute pression pour augmenter la pression de l'azote ou de l'oxygène immédiatement avant leur admission dans l'échangeur de chaleur cryogénique où le liquide est vaporisé et le gaz entrant est refroidi.

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