Composite ceramic membrane oxygen separation method

B - Operations – Transporting – 01 – D

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B01D 53/22 (2006.01) B01D 69/02 (2006.01) B01D 71/02 (2006.01) C01B 13/02 (2006.01)

Patent

CA 2411063

A method of separating oxygen from an oxygen containing gas with a composite membrane capable of conducting oxygen ions and electrons. The composite membrane is subjected to an operational temperature and the oxygen containing gas at a cathode side thereof. The composite membrane has a dense layer (10), at least one active porous layer (14) contiguous to dense layer (10), and at least one porous support layer (16, 18, 20). The active porous layer (14) has a thickness and a distribution of pore radii (r3) that has a standard deviation from a theoretical radius that would produce a maximum oxygen flux through the thickness (t3) of the porous layer (14) when the thickness is about equal to a product of a constant and the square root of the theoretical radius.

L'invention concerne un procédé servant à séparer l'oxygène d'un gaz contenant de l'oxygène au moyen d'une membrane composite conductrice d'ions et d'électrons d'oxygène. La membrane composite est soumise à une température opérationnelle et l'oxygène contenant du gaz l'est du côté de la cathode. Cette membrane composite possède une couche dense (10), au moins une couche poreuse active (14) contiguë à la couche dense (10), et au moins une couche de support poreuse (16, 18, 20). La couche poreuse active (14) possède une épaisseur et une distribution des rayons des pores (r3) comportant une déviation standard par rapport au radius théorique pouvant produire un débit d'oxygène maximum à travers l'épaisseur (t3) de la couche poreuse (14) lorsque cette épaisseur se rapproche d'un produit de constante et de la racine carrée du radius théorique.

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