Atmospheric gas separation method

F - Mech Eng,Light,Heat,Weapons – 25 – J

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F25J 3/04 (2006.01) B01J 19/32 (2006.01)

Patent

CA 2140561

A method of cryogenically separating a mixture of atmospheric gases within a distillation column system having at least one distillation column. In accordance with the method, liquid and gaseous phases of the mixture of atmospheric gases to be separated are countercurrently passed through structured packing.. The column is operated with a pressure greater than 2 bars and with a vapor rate of the vapor phase that is less than a critical vapor rate at which the column floods and which varies with the liquid rate of the liquid phase. Minimum and critical vapor rates at which the column floods are set in accordance with experimentally derived data for maximum column utilization in terms of packing volume or column throughput. Additionally, separation performance in terms of HETP increases with the increase in pressure so that a lower than prior art height of structured packing can be used to obtain a particular separation.

Méthode de séparation cryogénique d'un mélange de gaz atmosphériques au moyen d'un système de colonne de distillation comportant au moins une colonne de distillation. Selon cette méthode, les phases liquides et gazeuses du mélange de gaz atmosphériques à séparer passent à contre-courant à travers un milieu structuré. La colonne fonctionne à une pression supérieure à 2 bars et le taux d'évaporation de la phase gazeuse est inférieur à un taux critique auquel la colonne déborde, et varie avec le taux de liquide de la phase liquide. Les taux de vapeur minimums et critiques auxquelles la colonne déborde sont réglés selon des données expérimentales pour favoriser une utilisation optimale de la colonne du point de vue du volume et du rendement. De plus, la performance de séparation en termes de HETP augmente avec l'élévation de la pression de sorte qu'il est possible d'utiliser, pour le milieu, une hauteur inférieure à ce qui est employé dans l'état actuel de la technique pour obtenir une séparation particulière.

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