US5240480A — Composite mixed conductor membranes for producing…

Claim 1

Independent Claim 70 words

A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a porous layer having an average pore radius of less than about 10 micrometers and a dense layer having no connected through porosity wherein the porous layer and the dense layer are contiguous and each layer comprises a multicomponent metallic oxide capable of conducting electrons and oxygen ions at a temperature greater than about 500° C.

Claim 2

Dependent Claim 70 words

A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a porous layer having an average pore radius of less than about 10 micrometers and a dense layer having no connected through porosity wherein the porous layer and the dense layer are contiguous and each layer comprises a multicomponent metallic oxide capable of conducting electrons and oxygen ions at a temperature greater than about 500° C.

Claim 3

Dependent Claim 36 words

The membrane according to claim 1 wherein the dense layer has a thickness ranging from 0.01 micrometer to about 500 micrometers and the porous layer has a thickness ranging from 1 micrometer to about 2 millimeters.

Claim 4

Dependent Claim 48 words

The membrane according to claim 2 wherein the multicomponent metallic oxide demonstrates an oxygen ionic conductivity ranging from 0.01 ohm -1 cm -1 to 100 ohm -1 cm -1 and an electronic conductivity ranging from about 1 ohm -1 cm -1 to 100 ohm -1 cm -1 .

Claim 5

Dependent Claim 105 words

The membrane according to claim 3 wherein the dense layer and the porous layer are independently formed from one or a mixture of multicomponent metallic oxides represented by the formula A x A' x' A" x" B y B' y' B" y" O 3-z , where A,A',A" are chosen from the group comprising Groups 1, 2 and 3 and the F block lanthanides; and B,B'B" are chosen from the D block transition metals according to the Periodic Table of the Elements adopted by the IUPAC wherein 0<x≦1, 0<x'≦1, 0<x"≦1, 0<y≦1, 0≦y'≦1, 0≦y"≦1, x+x'+x"=1, y+y'+y"=1 and z is a number which renders the compound charge neutral.

Claim 6

Dependent Claim 31 words

The membrane according to claim 4 wherein A, A' or A" of the enumerated formula is a Group 2 metal selected from the group consisting of calcium, strontium, barium and magnesium.

Claim 7

Dependent Claim 53 words

The membrane according to claim 5 wherein the dense layer is formed from a multicomponent metallic oxide represented by the formula La x A 1-x Co y Fe 1-y O 3-z wherein x is between 0 and 1, y is between 0 and 1 and A is selected from barium, strontium or calcium.

Claim 8

Dependent Claim 72 words

The membrane according to claim 4 wherein the dense layer is formed from a multicomponent metallic oxide is selected from the group consisting of La 0 .2 Ba 0 .8 Co 0 .8 Fe 0 .2 O 3-x , Pr 0 .2 Ba 0 .8 Co 0 .8 Fe 0 .2 O 3-x and La 0 .2 Ba 0 .8 Co 0 .6 Cu 0 .2 Fe 0 .2 O 3-x .

Claim 9

Dependent Claim 79 words

A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a dense layer having no connected through porosity, which dense layer is contiguous to a porous layer having an average pore radius which increases as a function of distance away from the dense layer, the porous layer and the dense layer which are independently formed from a multicomponent metallic oxide capable of conducting electrons and oxygen ions at a temperature greater than about 500° C.

Claim 10

Dependent Claim 79 words

A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a dense layer having no connected through porosity, which dense layer is contiguous to a porous layer having an average pore radius which increases as a function of distance away from the dense layer, the porous layer and the dense layer which are independently formed from a multicomponent metallic oxide capable of conducting electrons and oxygen ions at a temperature greater than about 500° C.

Claim 11

Dependent Claim 36 words

The membrane according to claim 8 wherein the dense layer has a thickness ranging from 0.01 micrometer to about 500 micrometers and the porous layer has a thickness ranging from 1 micrometer to about 2 millimeters.

Claim 12

Dependent Claim 48 words

The membrane according to claim 8 wherein the multicomponent metallic oxide demonstrates an oxygen ionic conductivity ranging from 0.01 ohm -1 cm -1 to 100 ohm -1 cm -1 and an electronic conductivity ranging from about 1 ohm -1 cm -1 to 100 ohm -1 cm -1 .

Claim 13

Dependent Claim 105 words

The membrane according to claim 10 wherein the dense layer and the porous layer are independently formed from one or a mixture of multicomponent metallic oxides represented by the formula A x A' x' A" x" B y B' y' B" y" O 3-z , where A,A',A" are chosen from the group comprising Groups 1, 2 and 3 and the F block lanthanides; and B,B',B" are chosen from the D block transition metals according to the Periodic Table of the Elements adopted by the IUPAC wherein 0<x≦1, 0≦x'≦1, 0≦x"≦1, 0<y≦1, 0≦y'≦1, 0≦y"≦1, x+x'+x"=1, y+y'+y"=1 and z is a number which renders the compound charge neutral.

Claim 14

Dependent Claim 30 words

The membrane according to claim 11 wherein A, A' or A" of the formula is a Group 2 metal selected from the group consisting of calcium, strontium, barium and magnesium.

Claim 15

Dependent Claim 53 words

The membrane according to claim 11 wherein the dense layer is formed from a multicomponent metallic oxide represented by the formula La x A 1-x Co y Fe 1-y O 3-z wherein x is between 0 and 1, y is between 0 and 1 and A is selected from barium, strontium or calcium.

Claim 16

Dependent Claim 71 words

The membrane according to claim 11 wherein the dense layer is formed from a multicomponent metallic oxide selected from the group consisting of La 0 .2 Ba 0 .8 Co 0 .8 Fe 0 .2 O 3-x , Pr 0 .2 Ba 0 .8 Co 0 .8 Fe 0 .2 O 3-x and La 0 .2 Ba 0 .8 Co 0 .6 Cu 0 .2 Fe 0 .2 O 3-x .

Claim 17

Dependent Claim 99 words

A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a dense layer having no connected through porosity and a plurality of porous layers, each respective porous layer having a discrete average pore radius wherein the average pore radius of each respective porous layer is larger than the average pore radius of the preceding porous layer as function of distance away from the dense layer, the porous layer and the dense layer which are independently formed from a multicomponent metallic oxide capable of conducting electrons and oxygen ions at temperatures greater than about 500° C.

Claim 18

Dependent Claim 99 words

A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a dense layer having no connected through porosity and a plurality of porous layers, each respective porous layer having a discrete average pore radius wherein the average pore radius of each respective porous layer is larger than the average pore radius of the preceding porous layer as function of distance away from the dense layer, the porous layer and the dense layer which are independently formed from a multicomponent metallic oxide capable of conducting electrons and oxygen ions at temperatures greater than about 500° C.

Claim 19

Dependent Claim 36 words

The membrane according to claim 15 wherein the dense layer has a thickness ranging from 0.01 micrometer to about 500 micrometers and the porous layer has a thickness ranging from 1 micrometer to about 2 millimeters.

Claim 20

Dependent Claim 48 words

The membrane according to claim 16 wherein the multicomponent metallic oxide demonstrates an oxygen ionic conductivity ranging from 0.01 ohm -1 cm -1 to 100 ohm -1 cm -1 and an electronic conductivity ranging from about 1 ohm -1 cm -1 to 100 ohm -1 cm -1 .

Claim 21

Dependent Claim 105 words

The membrane according to claim 17 wherein the dense layer and the porous layer are independently formed from one or a mixture of multicomponent metallic oxides represented by the formula A x A' x' A" x" B y B' y' B" y" O 3-z , where A,A',A" are chosen from the group comprising Groups 1, 2 and 3 and the F block lanthanides; and B,B',B" are chosen from the D block transition metals according to the Periodic Table of the Elements adopted by the IUPAC wherein 0<x≦1, 0≦x'≦1, 0≦x"≦1, 0<y≦1, 0≦y'≦1, 0≦y"≦1, x+x'+x"=1, y+y'+y"=1 and z is a number which renders the compound charge neutral.

Claim 22

Dependent Claim 30 words

The membrane according to claim 18 wherein A, A' or A" of the formula is a Group 2 metal selected from the group consisting of calcium, strontium, barium and magnesium.

Claim 23

Dependent Claim 53 words

The membrane according to claim 18 wherein the dense layer is formed from a multicomponent metallic oxide represented by the formula La x A 1-x Co y Fe 1-y O 3-z wherein x is between 0 and 1, y is between 0 and 1 and A is selected from barium, strontium or calcium.

Claim 24

Dependent Claim 71 words

The membrane according to claim 18 wherein the dense layer is formed from a multicomponent metallic oxide is selected from the group consisting of La 0 .2 Ba 0 .8 Co 0 .8 Fe 0 .2 O 3-x , Pr 0 .2 Ba 0 .8 Co 0 .8 Fe 0 .2 O 3-x and La 0 .2 Ba 0 .8 Co 0 .6 Cu 0 .2 Fe 02 O 3-x .

Claim 25

Dependent Claim 82 words

A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a first porous layer formed from a multicomponent metallic oxide having an average pore radius of less than about 10 micrometers which is deposed to a second porous layer which is not a mixed conducting oxide, the first porous layer being contiguous with a dense layer having no connected through porosity comprising a multicomponent metallic oxide capable of conducting oxygen ions at temperatures greater than about 500° C.

Claim 26

Dependent Claim 82 words

A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a first porous layer formed from a multicomponent metallic oxide having an average pore radius of less than about 10 micrometers which is deposed to a second porous layer which is not a mixed conducting oxide, the first porous layer being contiguous with a dense layer having no connected through porosity comprising a multicomponent metallic oxide capable of conducting oxygen ions at temperatures greater than about 500° C.

Claim 27

Dependent Claim 48 words

The membrane according to claim 22 wherein the porous layer which is not a mixed conducting oxide is formed from a material selected from the group consisting of alumina, silica, magnesia, titania, a high temperature oxygen compatible metal alloy, a metal stabilized zirconia and compounds and mixtures thereof.

Claim 28

Dependent Claim 21 words

The membrane according to claim 22 wherein the dense layer has a thickness ranging from 0.01 micrometer to about 500 micrometers.

Claim 29

Dependent Claim 54 words

The membrane according to claim 24 wherein the dense layer is formed from a multicomponent metallic oxide demonstrates an oxygen ionic conductivity ranging from 0.01 ohm -1 cm -1 to 100 ohm -1 cm -1 and an electronic conductivity ranging from about 1 ohm -1 cm -1 to 100 ohm -1 cm -1 .

Claim 30

Dependent Claim 106 words

The membrane according to claim 25 wherein the dense layer and the first porous layer are independently formed from one or a mixture of multicomponent metallic oxides represented by the formula A x A' x' A" x" B y B' y' B" y" O 3-z , where A,A',A" are chosen from the group comprising Groups 1, 2 and 3 and the F block lanthanides; and B,B',B" are chosen from the D block transition metals according to the Periodic Table of the Elements adopted by the IUPAC wherein 0<x≦1, 0≦x'≦1, 0≦x"≦1, 0<y≦1, 0≦y'≦1, 0≦y"≦1, x+x'+x"=1, y+y'+y"=1 and z is a number which renders the compound charge neutral.

Claim 31

Dependent Claim 30 words

The membrane according to claim 25 wherein A, A' or A" of the formula is a Group 2 metal selected from the group consisting of calcium, strontium, barium and magnesium.

Claim 32

Dependent Claim 59 words

The membrane according to claim 25 wherein the dense layer and the first porous layer are independently formed from a multicomponent metallic oxide represented by the formula La x A 1-x Co y Fe 1-y O 3-z wherein x is between 0 and 1, y is between 0 and 1 and A is selected from barium, strontium or calcium.

Claim 33

Dependent Claim 74 words

The membrane according to claim 25 wherein the dense layer and the first porous layer are independently formed from a multicomponent metallic oxide selected from the group consisting of La 0 .2 Ba 0 .8 Co 0 .8 Fe 0 .2 O 3-x , Pr 0 .2 Ba 0 .8 Fe 0 .2 O 3-x and La 0 .2 Ba 0 .8 Co 0 .6 Cu 0 .2 Fe 0 .2 O 3-x .

Claim 34

Dependent Claim 73 words

A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a first porous layer and a second porous layer which are separated by and contiguous with a dense layer having no connected through porosity wherein the first porous layer, the second porous layer and the dense layer are independently formed from a multicomponent metallic oxide capable of conducting electrons and oxygen ions at temperatures greater than about 500° C.

Claim 35

Dependent Claim 73 words

A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a first porous layer and a second porous layer which are separated by and contiguous with a dense layer having no connected through porosity wherein the first porous layer, the second porous layer and the dense layer are independently formed from a multicomponent metallic oxide capable of conducting electrons and oxygen ions at temperatures greater than about 500° C.

Claim 36

Dependent Claim 36 words

The membrane according to claim 30 wherein the dense layer has a thickness ranging from 0.01 micrometer to about 500 micrometers and the porous layer has a thickness ranging from 1 micrometer to about 2 millimeters.

Claim 37

Dependent Claim 48 words

The membrane according to claim 31 wherein the multicomponent metallic oxide demonstrates an oxygen ionic conductivity ranging from 0.01 ohm -1 cm -1 to 100 ohm -1 cm -1 and an electronic conductivity ranging from about 1 ohm -1 cm -1 to 100 ohm -1 cm -1 .

Claim 38

Dependent Claim 108 words

The membrane according to claim 32 wherein the dense layer and the first and second porous layers are independently formed from one or a mixture of multicomponent metallic oxides represented by the formula A x A' x' A" x" B y B' y' B" y" O 3-z , where A,A',A" are chosen from the group comprising Groups 1, 2 and 3 and the F block lanthanides; and B,B',B" are chosen from the D block transition metals according to the Periodic Table of the Elements adopted by the IUPAC wherein 0<x≦1, 0≦x'≦1, 0≦x"≦1, 0<y≦1, 0≦y'≦1, 0≦y"≦1, x+x'+x"=1, y+y'+y"=1 and z is a number which renders the compound charge neutral.

Claim 39

Dependent Claim 30 words

The membrane according to claim 33 wherein A, A' or A" of the formula is a Group 2 metal selected from the group consisting of calcium, strontium, barium and magnesium.

Claim 40

Dependent Claim 53 words

The membrane according to claim 33 wherein the dense layer is formed from a multicomponent metallic oxide represented by the formula La x A 1-x Co y Fe 1-y O 3-z wherein x is between 0 and 1, y is between 0 and 1 and A is selected from barium, strontium or calcium.

Claim 41

Dependent Claim 72 words

The membrane according to claim 33 wherein the dense layer is formed from a multicomponent metallic oxide is selected from the group consisting of La 0 .2 Ba 0 .8 Co 0 .8 Fe 0 .2 O 3-x , Pr 0 .2 Ba 0 .8 Co 0 .8 Fe 0 .2 O 3-x and La 0 .2 Ba 0 .8 Co 0 .6 Cu 0 .2 Fe 0 .2 O 3-x .

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-08-30	1997-03-01	1997-08-31	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-08-30	2001-03-01	2001-08-31	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-08-30	2005-03-01	2005-08-31	$7700.00	Window Closed / Lapsed

Composite mixed conductor membranes for producing oxygen

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