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An ion transport membrane system comprising (a) a pressure vessel having an interior, an inlet adapted to introduce gas into the interior of the vessel, an outlet adapted to withdraw gas from the interior of the vessel, and an axis; (b) a plurality of planar ion transport membrane modules disposed i

An ion transport membrane system comprising (a) a pressure vessel having an interior, an inlet adapted to introduce gas into the interior of the vessel, an outlet adapted to withdraw gas from the interior of the vessel, and an axis; (b) a plurality of planar ion transport membrane modules disposed in the interior of the pressure vessel and arranged in series, each membrane module comprising mixed metal oxide ceramic material and having an interior region and an exterior region; and (c) one or more gas flow control partitions disposed in the interior of the pressure vessel and adapted to change a direction of gas flow within the vessel.

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The invention claimed is: 1. An ion transport membrane system comprising (a) a pressure vessel having an interior, an inlet adapted to introduce gas into the interior of the vessel, an outlet adapted to withdraw gas from the interior of the vessel, and an axis; (b) a plurality of planar ion transpo

The invention claimed is: 1. An ion transport membrane system comprising (a) a pressure vessel having an interior, an inlet adapted to introduce gas into the interior of the vessel, an outlet adapted to withdraw gas from the interior of the vessel, and an axis; (b) a plurality of planar ion transport membrane modules disposed in the interior of the pressure vessel and arranged in series, each membrane module comprising mixed metal oxide ceramic material and having an interior region and an exterior region; (c) one or more gas flow control partitions disposed in the interior of the pressure vessel and adapted to change a direction of gas flow within the vessel; and (d) a flow containment duct disposed in the interior of the pressure vessel, wherein the flow containment duct has an interior region, surrounds the plurality of planar ion transport membrane modules, and is in flow communication with the inlet and outlet of the pressure vessel, and wherein the one or more gas flow control partitions are disposed in the interior region of the flow containment duct. 2. The system of claim 1 wherein each planar membrane module comprises a plurality of wafers having planar parallel surfaces, and wherein the pressure vessel is cylindrical and the axis is parallel to some or all of the planar parallel surfaces of the wafers. 3. The system of claim 1 wherein the flow containment duct and the one or more gas flow control partitions comprise an oxidation-resistant metal alloy containing iron and one or more elements selected from the group consisting of nickel and chromium. 4. The system of claim 1 wherein at least two of the planar ion transport membrane modules define a module axis, and wherein the pressure vessel is cylindrical and has an axis that is parallel to or coaxial with the module axis. 5. The system of claim 1 wherein at least two of the planar ion transport membrane modules define a module axis, and wherein the pressure vessel is cylindrical and has an axis that is perpendicular to the module axis. 6. The system of claim 1 wherein each of the one or more flow control partitions is oriented such that an initial direction of gas flow is diverted to a final direction of gas flow wherein the angle formed between the initial direction of gas flow and the final direction of gas flow forms an angle of greater than zero degrees and less than or equal to 180 degrees. 7. The system of claim 6 wherein each of the one or more flow control partitions is oriented such that the initial direction of gas flow is diverted to a final direction of gas flow wherein the angle formed between the initial direction of gas flow and the final direction of gas flow forms an angle of greater than 90 degrees and less than or equal to 180 degrees. 8. The system of claim 6 wherein each of the one or more flow control partitions is oriented such that the initial direction of gas flow is diverted to a final direction of gas flow wherein the angle formed between the initial direction of gas flow and the final direction of gas flow forms an angle of 180 degrees. 9. The system of claim 1 which further comprises (d) one or more additional pressure vessels, each having an interior, an inlet adapted to introduce gas into the interior of the vessel, an outlet adapted to withdraw gas from the interior of the vessel, and an axis; (e) a plurality of planar ion transport membrane modules disposed in the interior of each of the pressure vessels and arranged in series, each membrane module comprising mixed metal oxide ceramic material and having an interior region and an exterior region; and (f) one or more gas flow control partitions disposed in the interior of each of the pressure vessels and adapted to change a direction of gas flow within any of the one or more pressure vessels; wherein at least two of the pressure vessels are arranged in series such that the outlet of one pressure vessel is in flow communication with the inlet of another pressure vessel. 10. The system of claim 1 which further comprises (d) one or more additional pressure vessels, each having an interior, an inlet adapted to introduce gas into the interior of the vessel, an outlet adapted to withdraw gas from the interior of the vessel, and an axis; (e) a plurality of planar ion transport membrane modules disposed in the interior of each of the pressure vessels and arranged in series, each membrane module comprising mixed metal oxide ceramic material and having an interior region and an exterior region; and (f) one or more gas flow control partitions disposed in the interior of each of the pressure vessels and adapted to change a direction of gas flow within any of the one or more pressure vessels; wherein at least two of the pressure vessels are arranged in parallel such that any inlet of one pressure vessel and any inlet of another pressure vessel are in flow communication with a common feed conduit. 11. The system of claim 1 which further comprises catalyst disposed between any two of the planar ion transport membrane modules arranged in series. 12. The reactor system of claim 11 wherein the catalyst comprises one or more metals or compounds containing metals selected from the group consisting of nickel, cobalt, platinum, gold, palladium, rhodium, ruthenium, and iron. 13. The reactor system of claim 11 wherein the catalyst is placed between a plurality of the modules in series and the activity of the catalyst varies at different locations between the modules in series.