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US 5,702,999 AGranted
Oxygen permeable mixed conductor membranes
AssigneeThe Standard Oil Company
InventorsTerry J. Mazanec, Thomas L. Cable
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AssigneeThe Standard Oil Company
InventorsTerry J. Mazanec, Thomas L. Cable
Estimating the term…
The present invention relates to novel solid state mixed conductor membranes and their use for separating oxygen from oxygen-containing feeds at elevated temperatures. The membranes comprise a multicomponent metallic oxide of substantially cubic perovskite structure, stable in air over the temperature range of 25.degree.-950.degree. C., having no connected through porosity wherein the membrane is of a composition represented by the formula A.sub.1-x A'.sub.x !Co.sub.1-y-z B.sub.y B'.sub.z !O.sub.3-.delta., where A.ident.Ca, Sr, Ba, and mixtures thereof; A'.ident.La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B.ident.Fe, Mn, Cr, V, Ti, and mixtures thereof; B'.ident.Cu, Ni, and mixtures thereof; .about.0.0001.ltoreq..times..ltoreq..about.0.1; .about.0.002.ltoreq.y<0.05; .about.0.0005.ltoreq.z.ltoreq..about.0.3; .delta. is determined by the valence of the metals.
A process for oxygen separation, which process comprises contacting a suitable oxygen-containing fluid at temperatures between 25.degree. and 950.degree. C. with a membrane comprising a composition of substantially cubic perovskite structure represented by the empirical formula
A fluid separation device utilizing at least one membrane comprising a composition of substantially cubic perovskite structure, substantially stable in air over the temperature range of 25.degree.-950.degree. C., represented by the empirical formula
Dependencies are inferred from the claim text.