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The invention is a process and device for exchanging heat energy between three or more streams in a microchannel heat exchanger which can be integrated with a microchannel reactor to form an integrated microchannel processing unit. The invention enables the combining of a plurality of integrated mic

The invention is a process and device for exchanging heat energy between three or more streams in a microchannel heat exchanger which can be integrated with a microchannel reactor to form an integrated microchannel processing unit. The invention enables the combining of a plurality of integrated microchannel devices to provide the benefits of large-scale operation. In particular, the microchannel heat exchanger of the present invention enables flexible heat transfer between multiple streams and total heat transfer rates of about 1 Watt or more per core unit volume expressed as W/cc.

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We claim: 1. A microchannel device comprising: a heat exchanger and reactor in combination; the heat exchanger comprising: a first; and a second microchannel; the reactor comprising: a first reactor microchannel in fluid communication with the first heat exchanger microchannel; a second reactor mi

We claim: 1. A microchannel device comprising: a heat exchanger and reactor in combination; the heat exchanger comprising: a first; and a second microchannel; the reactor comprising: a first reactor microchannel in fluid communication with the first heat exchanger microchannel; a second reactor microchannel in fluid communication with the second heat exchanger microchannel; and a third reactor microchannel in fluid communication with the second reactor microchannel. 2. The microchannel device of claim 1, wherein at least one microchannel has at least one internal dimension of width or height of about 2 mm or less. 3. The microchannel device of claim 2, wherein at least one microchannel has at least one internal dimension of width or height of about 0.1 mm or less. 4. The microchannel device of claim 1, further comprising a catalyst disposed within the second reactor microchannel. 5. The device of claim 1, wherein the first reactor microchannel is in thermal communication with the second reactor microchannel. 6. The device of claim 1, wherein the first heat exchanger microchannel is in thermal communication with the second heat exchanger microchannel. 7. The device of claim 1, further comprising a catalyst disposed within the first reactor microchannel. 8. The microchannel device of claim 1, wherein: the second reactor microchannel comprises a combustion microchannel in thermal communication with the first reactor microchannel; and the third reactor microchannel comprises an oxidizer microchannel in fluid communication with the combustion microchannel. 9. The device of claim 8, further comprising a catalyst disposed within the first reactor microchannel. 10. The device of claim 8, further comprising a catalyst disposed within the combustion microchannel. 11. The microchannel device of claim 1, wherein: the third reactor microchannel is formed to include one or more apertures, the third reactor microchannel in fluid communication with the second reactor microchannel through the one or more apertures. 12. The microchannel device of claim 1, wherein when: a first stream is introduced into the first reactor microchannel; a second stream comprising at least a first reactant is introduced into the second reactor microchannel; and an at least third stream comprising at least a second reactant is introduced into the third reactor microchannel; an at least first unit operation proceeds in the first reactor microchannel, the at least first reactant and the at least second reactant react to form an at least first product via an at least first chemical reaction, and heat energy is transferred between the first reactor microchannel and the second reactor microchannel. 13. A process for carrying out an endothermic reaction comprising: (a) providing a device according to claim 1; (b) introducing a first stream, comprising at least one endothermic reactant, into the first reactor microchannel, whereby the at least one endothermic reactant is converted to at least one endothermic product; (c) introducing a second stream, comprising a fuel, into the second reactor microchannel; and (d) introducing a third stream, comprising an oxidizer, into the third reactor microchannel, whereby the fuel is oxidized to at least one exhaust product. 14. The process of claim 13, further comprising contacting the at least one endothermic reactant with a catalyst. 15. The process of claim 13, further comprising contacting the oxidizer and fuel with a catalyst. 16. The process of claim 13, wherein: the at least one endothermic reactant comprises a hydrocarbon; and the at least one endothermic product comprises a synthesis gas. 17. The process of claim 16, further comprising exposing the hydrocarbon to a catalyst. 18. The process of claim 16, further comprising exposing the fuel and the oxidizer to a catalyst. 19. A microchannel device comprising: a heat exchanger and reactor in combination; the heat exchanger having a distal end and a proximal end and comprising: a first; a second; a third; and a fourth microchannel, each heat exchanger microchannel defining a passageway between the distal end and the proximal end; the reactor being integral to the heat exchanger proximal end and comprising: a first microchannel reactor section, the first microchannel reactor section in fluid communication with the first heat exchanger microchannel and the second heat exchanger microchannel; and a second microchannel reactor section, the second microchannel reactor section in fluid communication with the third heat exchanger microchannel and the fourth heat exchanger microchannel. 20. The microchannel device of claim 19: the heat exchanger further comprising: a fifth microchannel, the fifth microchannel defining a passageway between the distal end and the proximal end; and the reactor further comprising: a third microchannel reactor section, the third microchannel reactor section in fluid communication with the fifth heat exchanger microchannel and in fluid communication with the second microchannel reactor section. 21. The device of claim 20, further comprising a catalyst disposed within the first microchannel reactor section. 22. The device of claim 20, further comprising a catalyst disposed within the second microchannel reactor section. 23. The device of claim 20, wherein: when a reactants feed stream is introduced into the second heat exchanger microchannel at the distal end, a fuel stream is introduced into the third heat exchanger microchannel at the distal end, an oxygen-containing stream is introduced into the fifth heat exchanger microchannel at the distal end, a products stream is allowed to discharge through the first heat exchanger microchannel at the distal end, and an exhaust stream is allowed to discharge through the fourth heat exchanger microchannel at the distal end; within the heat exchanger, the products stream gives up heat to the feed stream and the exhaust stream gives up heat to a stream chosen from the group consisting of: the oxygen-containing stream; the fuel stream; and combinations thereof; within the reactor, the oxygen-containing stream and the fuel stream combine in a combustion reaction which provides heat for one or more reactions; and the reactants feed stream is at least partially converted to the products stream. 24. The microchannel device of claim 20, wherein: the third microchannel reactor section if formed to include one or more apertures, the third microchannel reactor section in fluid communication with the second reactor microchannel section through the one or more apertures. 25. The device of claim 19, further comprising a catalyst disposed within the first microchannel reactor section. 26. The device of claim 19, further comprising a catalyst disposed within the second microchannel reactor section. 27. The device of claim 26, further comprising a catalyst disposed within the third heat exchanger microchannel. 28. A microchannel device comprising: a heat exchanger and a reactor in combination; the heat exchanger comprising: a first; a second; a third; a fourth; a fifth; a sixth; a seventh; and an eighth microchannel; the reactor being integral to the heat exchanger and comprising: a first exothermic reaction microchannel, the first exothermic reaction microchannel in fluid communication with the fourth heat exchanger microchannel and the sixth heat exchanger microchannel; a second exothermic reaction microchannel in fluid communication with the eighth heat exchanger microchannel and the sixth heat exchanger microchannel; a third exothermic reaction microchannel in fluid communication with the fifth heat exchanger microchannel and the first exothermic reaction microchannel; a fourth exothermic reaction microchannel in fluid communication with the seventh heat exchanger microchannel and the second exothermic reaction microchannel; a first endothermic reaction microchannel in fluid communication with the first heat exchanger microchannel and the second heat exchanger microchannel; and a second endothermic reaction microchannel in fluid communication with the third heat exchanger microchannel and the second heat exchanger microchannel. 29. The device of claim 28, further comprising a catalyst disposed within at least one of the endothermic reaction microchannels. 30. The device of claim 28, further comprising a catalyst disposed within at least one of the exothermic reaction microchannels. 31. The device of claim 28, further comprising a tongue interposed between the first exothermic reaction microchannel and the second exothermic reaction microchannel. 32. The device of claim 28, further comprising a tongue interposed between the first endothermic reaction microchannel and the second endothermic reaction microchannel. 33. The microchannel device of claim 28, wherein: the third exothermic reaction microchannel is formed to include one or more apertures, the third reaction microchannel in fluid communication with the first exothermic reaction microchannel through the one or more apertures. 34. The microchannel device of claim 28, wherein: the fourth exothermic reaction microchannel is formed to include one or more apertures, the fourth reaction microchannel in fluid communication with the second exothermic reaction microchannel through the one or more apertures. 35. The microchannel device of claim 28, further comprising: a tongue interposed between the first exothermic reaction microchannel and the second exothermic reaction microchannel, wherein a first stream flowing in the first exothermic reaction microchannel in a direction toward the tongue and a second stream flowing in the second exothermic reaction microchannel in a direction toward the tongue in a direction substantially opposite from the first stream impinge upon opposite sides of the tongue and are directed into the sixth heat exchanger microchannel whereby the first stream and the second stream become combined. 36. The microchannel device of claim 35, wherein the tongue extends into the sixth heat exchanger microchannel. 37. The microchannel device of claim 28, further comprising: a tongue interposed between the first endothermic reaction microchannel and the second endothermic reaction microchannel, wherein a first stream flowing in the first endothermic reaction microchannel in a direction toward the tongue and a second stream flowing in the second endothermic reaction microchannel in a direction toward the tongue in a direction substantially opposite from the first stream impinge upon opposite sides of the tongue and are directed into the second heat exchanger microchannel whereby the first stream and the second stream become combined. 38. The microchannel device of claim 37, wherein the tongue extends into the second heat exchanger microchannel. 39. A microchannel apparatus comprising: a plurality of microchannel devices, each device comprising: a heat exchange section comprising at least five microchannels; and a reaction section in combination, the reaction section being integral to the heat exchange section, and comprising: a first reaction microchannel in fluid communication with the first heat exchange section microchannel and the second heat exchange section microchannel; a second reaction microchannel in fluid communication with the third heat exchange section microchannel and the fourth heat exchange section microchannel; and a third reaction microchannel in fluid communication with the at least fifth heat exchange section microchannel and further in fluid communication with the second reaction microchannel. 40. The microchannel apparatus of claim 39, further comprising: a first manifold in fluid communication with the first heat exchange section microchannel of each microchannel device; a second manifold in fluid communication with the second heat exchange section microchannel of each microchannel device; a third manifold in fluid communication with the third heat exchange section microchannel of each microchannel device; and a fourth manifold in fluid communication with the fifth heat exchange section microchannel of each microchannel device. 41. The microchannel apparatus of claim 39, wherein: the third reaction microchannel comprises one or more apertures, the third reaction microchannel in fluid communication with the second reaction microchannel through the one or more apertures. 42. A microchannel apparatus for conducting a chemical reaction, the apparatus comprising a plurality of microchannel devices, each device comprising: a plurality of first reactants microchannels, each first reactants microchannel in fluid communication with an outside surface of the device; a plurality of first products microchannels, each first products microchannel in fluid communication with a respective first reactants microchannel and in fluid communication with an outside surface of the device; a plurality of second reactants microchannels, each second reactants microchannel in fluid communication with a respective first products microchannel and in fluid communication with an outside surface of the device; a plurality of third reactants microchannels, each third reactants microchannel in fluid communication with an outside surface of the device; a plurality of fifth reactants microchannels, each fifth reactants microchannel in fluid communication with an outside surface of the apparatus and in fluid communication with a respective third reactants microchannel; a plurality of second products microchannels, each second microchannel in fluid communication with a respective third reactants microchannel and in fluid communication with an outside surface of the apparatus; a plurality of fourth reactants microchannels, each fourth reactants microchannel in fluid communication with a respective second products microchannel and in fluid communication with an outside surface of the apparatus; and a plurality of sixth reactants microchannels, each sixth microchannel in fluid communication with a respective fourth reactants microchannel and in fluid communication with an outside surface of the apparatus. 43. The apparatus of claim 42, the apparatus further comprising: a first header in fluid communication with the plurality of first reactants microchannels and in fluid communication with the plurality of second reactants microchannels; a second header in fluid communication with the plurality of first products microchannels; a third header in fluid communication with the plurality of third reactants microchannels and in fluid communication with the plurality of sixth reactants microchannels; a fourth header in fluid communication with the plurality of fifth reactants microchannels and in fluid communication with the plurality of fourth reactants microchannels; and a fifth header in fluid communication with the plurality of second products microchannels.