US5702999A
Expired / Lapsed
US
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Oxygen permeable mixed conductor membranes
Assignee: Standard Oil Co
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Filing: 1996-12-10
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Granted: 1997-12-30
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Expires: 2016-12-10
Abstract
Abstract 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 DEG -950 DEG C., having no connected through porosity wherein the membrane is of a composition represented by the formula [A1-xA'x][Co1-y-zByB'z]O3- delta , where A=Ca, Sr, Ba, and mixtures thereof; A'=La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B=Fe, Mn, Cr, V, Ti, and mixtures thereof; B'=Cu, Ni, and mixtures thereof; DIFFERENCE 0.0001</=x</= DIFFERENCE 0.1; DIFFERENCE 0.002</=y<0.05; DIFFERENCE 0.0005</=z</= DIFFERENCE 0.3; delta is determined by the valence of the metals.
Inventors
- 👤 Terry J. Mazanec
- 👤 Thomas L. Cable
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:24
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0083; B01D53/00; B01D53/22; B01D53/228; B01D53/32; B01D53/326; B01D67/0039; B01D67/0041; B01D67/00411; B01D67/0046; B01D71/00; B01D71/02; B01D71/022; B01D71/0223; B01D71/024; B01D71/0271; B01J; B01J19/00; B01J19/24; B01J19/2475; B01J8/00; B01J8/008; B01J8/009; C; C01; C01B; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0251; C01B13/0255; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/38; C01B3/386; C01G; C01G51/00; C01G51/40; C01G51/66; C01G51/68; C01G53/00; C01G53/40; C01G53/66; C01G53/68; C04; C04B; C04B35/00; C04B35/01; B01D2323/00; B01D2323/12; B01D2325/00; B01D2325/04; B01D2325/26; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00054; B01J2219/00056; B01J2219/00058; B01J2219/00063; B01J2219/00132; C01B2203/00; C01B2203/02; C01B2203/025; C01B2203/0261; C01B2203/10; C01B2203/1005; C01B2203/1035; C01B2203/12; C01B2203/1205; C01B2203/1211; C01B2203/1235; C01B2203/1241; C01B2203/1258; C01B2210/00; C01B2210/0043; C01B2210/0046; C01B2210/0062; C01B2210/0078; C01B2210/0079; C01P; C01P2002/00; C01P2002/30; C01P2002/34; C01P2002/50; C01P2002/52; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
163 words
A process for oxygen separation, which process comprises contacting a suitable oxygen-containing fluid at temperatures between 25° and 950° C. with a membrane comprising a composition of substantially cubic perovskite structure represented by the empirical formula A.sub.1-x A'.sub.x ! Co.sub.1-y-z B.sub.y B'.sub.z !O.sub.3-δ, wherein A is chosen from the group consisting of Ca, Sr, Ba, and mixtures thereof; A' is chosen from the group consisting of La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B is chosen from the group consisting of Fe, Mn, Cr, V, Ti, and mixtures thereof; B' is chosen from the group consisting of Cu, Ni, and mixtures thereof; x is not less than about 0.0001 and not greater than about 0.1; y is not less than about 0.002 and less than 0.05; z is not less than about 0.0005 and not greater than about 0.3; and δ is determined by the valence of the metals.
Claim 2
Dependent Claim
163 words
A process for oxygen separation, which process comprises contacting a suitable oxygen-containing fluid at temperatures between 25° and 950° C. with a membrane comprising a composition of substantially cubic perovskite structure represented by the empirical formula A.sub.1-x A'.sub.x ! Co.sub.1-y-z B.sub.y B'.sub.z !O.sub.3-δ, wherein A is chosen from the group consisting of Ca, Sr, Ba, and mixtures thereof; A' is chosen from the group consisting of La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B is chosen from the group consisting of Fe, Mn, Cr, V, Ti, and mixtures thereof; B' is chosen from the group consisting of Cu, Ni, and mixtures thereof; x is not less than about 0.0001 and not greater than about 0.1; y is not less than about 0.002 and less than 0.05; z is not less than about 0.0005 and not greater than about 0.3; and δ is determined by the valence of the metals.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein said fluid comprises air.
Claim 4
Dependent Claim
160 words
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°-950° C., represented by the empirical formula A.sub.1-x A'.sub.x ! Co.sub.1-y-z B.sub.y B'.sub.z !O.sub.3-δ wherein A is chosen from the group consisting of Ca, Sr, Ba, and mixtures thereof; A' is chosen from the group consisting of La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B is chosen from the group consisting of Fe, Mn, Cr, V, Ti, and mixtures thereof; B' is chosen from the group consisting of Cu, Ni, and mixtures thereof; x is not less than about 0.0001 and not greater than about 0.1; y is not less than about 0.0002 and less than 0.05; z is not less than about 0.0005 and not greater than about 0.3; and δ is determined by the valence of the metals.
Claim 5
Dependent Claim
160 words
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°-950° C., represented by the empirical formula A.sub.1-x A'.sub.x ! Co.sub.1-y-z B.sub.y B'.sub.z !O.sub.3-δ wherein A is chosen from the group consisting of Ca, Sr, Ba, and mixtures thereof; A' is chosen from the group consisting of La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B is chosen from the group consisting of Fe, Mn, Cr, V, Ti, and mixtures thereof; B' is chosen from the group consisting of Cu, Ni, and mixtures thereof; x is not less than about 0.0001 and not greater than about 0.1; y is not less than about 0.0002 and less than 0.05; z is not less than about 0.0005 and not greater than about 0.3; and δ is determined by the valence of the metals.
Claim 6
Dependent Claim
15 words
The fluid separation device of claim 3 utilized for separating oxygen from an oxygen-containing fluid.
Claim 7
Dependent Claim
14 words
The fluid separation device of claim 3 operated at temperatures greater than 500° C.
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