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Interior microchannels within microchannel apparatus are uniformly coated. Remarkably, these uniform coatings are formed from materials that are applied to the interior microchannels after an apparatus has been assembled or manufactured. Coatings can be made uniform along the length of a microchanne

Interior microchannels within microchannel apparatus are uniformly coated. Remarkably, these uniform coatings are formed from materials that are applied to the interior microchannels after an apparatus has been assembled or manufactured. Coatings can be made uniform along the length of a microchannel, in the corner of a microchannel, and/or throughout numerous microchannels in an array of microchannels. Techniques for tailoring the application of washcoats onto microchannels is also described.

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1. Microchannel apparatus, comprising: an interior microchannel comprising a microchannel wall;a contiguous post-assembly coating along a contiguous length of at least 1 cm of the microchannel wall;wherein the contiguous post-assembly coating has a contiguous length of at least 1 cm that has an aver

1. Microchannel apparatus, comprising: an interior microchannel comprising a microchannel wall;a contiguous post-assembly coating along a contiguous length of at least 1 cm of the microchannel wall;wherein the contiguous post-assembly coating has a contiguous length of at least 1 cm that has an average thickness measured perpendicular to the microchannel length and in the direction in which a coating grows away from the wall of at least 5 μm and wherein at least 90% of the contiguous length of coating is within +/−20% of the average thickness. 2. The microchannel apparatus of claim 1 wherein the contiguous post-assembly coating has a contiguous length of at least 1 cm that has an average thickness measured perpendicular to the microchannel length and in the direction in which a coating grows away from the wall of at least 15 μm and wherein at least 90% of the contiguous length of coating is within +/−3 μm of the average thickness. 3. A method of conducting a unit operation, comprising: passing a fluid into the interior microchannel of the apparatus of claim 1; andconducting a unit operation on the fluid in the interior microchannel. 4. The method of claim 3 wherein the interior microchannel comprises a catalytic material, and wherein the microchannel apparatus of claim 1 is a reactor, and wherein the unit operation comprises a chemical reaction. 5. The microchannel apparatus of claim 1 wherein the interior microchannel is a complex microchannel; wherein the complex microchannel includes one or more of the following characteristics: at least one contiguous microchannel having a turn of at least 45°; a length of 50 cm or more; a length of 20 cm or more along with a dimension of 2 mm or less; the microchannel is in a group of at least 2 adjacent channels, having an adjacent length of at least one cm, that are connected by plural orifices along a common microchannel wall where the area of orifices amounts to 20% or less of the area of the microchannel wall in which the orifices are located and where each orifice is 2 mm2 or smaller; or the microchannel is in a group of at least two parallel microchannels having a length of at least 1 cm, that have openings to an integral manifold, where the manifold includes at least one dimension that is no more than three times the minimum dimension of the parallel microchannels. 6. Microchannel apparatus, comprising: an interior, complex microchannel comprising a microchannel wall;a contiguous post-assembly coating along a contiguous length of at least 1 cm of the microchannel wall;wherein the contiguous post-assembly coating has a contiguous length of at least 1 cm that has an average thickness measured perpendicular to the microchannel length and in the direction in which a coating grows away from the wall of at least 1 μm and wherein at least 90% of the contiguous length of coating is within +/−20% of the average thickness;wherein the complex microchannel includes one or more of the following characteristics: at least one contiguous microchannel having a turn of at least 45°; a length of 50 cm or more; a length of 20 cm or more along with a dimension of 2 mm or less; the microchannel is in a group of at least 2 adjacent channels, having an adjacent length of at least one cm, that are connected by plural orifices along a common microchannel wall where the area of orifices amounts to 20% or less of the area of the microchannel wall in which the orifices are located and where each orifice is 2mm2 or smaller; or the microchannel is in a group of at least two parallel microchannels having a length of at least 1 cm, that have openings to an integral manifold, where the manifold includes at least one dimension that is no more than three times the minimum dimension of the parallel microchannels. 7. Microchannel apparatus, comprising: an interior microchannel comprising a microchannel wall;a contiguous post-assembly alumina coating along a contiguous length of at least 1 cm of the microchannel wall;wherein the contiguous post-assembly coating has a contiguous length of at least 1 cm that has an average thickness ‘measured perpendicular to the microchannel length and in the direction in which a coating grows away from the wall’ of at least 1 μm and wherein at least 90% of the contiguous length of coating is within +/−20% of the average thickness. 8. The microchannel apparatus of claim 1 wherein the contiguous post-assembly coating has a contiguous length of at least 20 cm. 9. The microchannel apparatus of claim 1 wherein the contiguous post-assembly coating has a contiguous length of at least 1 cm that has an average thickness (measured perpendicular to the microchannel length and in the direction in which a coating grows away from the wall) of at least 5 μm and wherein at least 95% of the contiguous length of coating is within +/−10% of the average thickness. 10. The microchannel apparatus of claim 6 wherein the contiguous post-assembly coating has a contiguous length of at least 1 cm that has an average thickness measured perpendicular to the microchannel length and in the direction in which a coating grows away from the wall of at least 5 μm and wherein at least 95% of the contiguous length of coating is within +/−10% of the average thickness. 11. The microchannel apparatus of claim 7 wherein the contiguous post-assembly coating has a contiguous length of at least 1 cm that has an average thickness (measured perpendicular to the microchannel length and in the direction in which a coating grows away from the wall) of at least 5 μm and wherein at least 95% of the contiguous length of coating is within +/−10% of the average thickness. 12. The microchannel apparatus of claim 1 wherein the contiguous post-assembly coating is an aluminide layer. 13. The microchannel apparatus of claim 7 wherein the interior microchannel is a complex microchannel; wherein the complex microchannel includes one or more of the following characteristics: at least one contiguous microchannel having a turn of at least 45°; a length of 50 cm or more; a length of 20 cm or more along with a dimension of 2 mm or less; the microchannel is in a group of at least 2 adjacent channels, having an adjacent length of at least one cm, that are connected by plural orifices along a common microchannel wall where the area of orifices amounts to 20% or less of the area of the microchannel wall in which the orifices are located and where each orifice is 2 mm2 or smaller; or the microchannel is in a group of at least two parallel microchannels having a length of at least 1 cm, that have openings to an integral manifold, where the manifold includes at least one dimension that is no more than three times the minimum dimension of the parallel microchannels. 14. The microchannel apparatus of claim 5 wherein the microchannel apparatus comprises at least 2 adjacent channels, having an adjacent length of at least one cm, that are connected by plural orifices along a common microchannel wall where the area of the orifices amounts to 20% or less of the area of the microchannel wall in which the orifices are located and wherein each orifice is 1 mm2 or smaller, wherein the contiguous post-assembly coating is disposed along the common microchannel wall. 15. The microchannel apparatus of claim 6 wherein the microchannel apparatus comprises at least 2 adjacent channels, having an adjacent length of at least one cm, that are connected by plural orifices along a common microchannel wall where the area of the orifices amounts to 20% or less of the area of the microchannel wall in which the orifices are located and wherein each orifice is 1 mm2 or smaller, wherein the contiguous post-assembly coating is disposed along the common microchannel wall. 16. The microchannel apparatus of claim 5 wherein the complex microchannel comprises a turn of at least 90° and a length of 2 mm or less along with a dimension of 2 mm or less. 17. The microchannel apparatus of claim 6 wherein the complex microchannel comprises a turn of at least 90°. 18. The microchannel apparatus of claim 17 wherein the complex microchannel comprises a length of 2 mm or less along with a dimension of 2 mm or less. 19. The microchannel apparatus of claim 1 wherein the post-assembly coating is formed by electroless plating. 20. The microchannel apparatus of claim 6 wherein the post-assembly coating is formed by electroless plating.