Vol.3 No.2 2010

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Research paper : Establishment of compact processes (A. Suzuki et al.)−156−Synthesiology - English edition Vol.3 No.2 (2010) The description of the high-pressure microcooler will be omitted in this paper, but the high-pressure microcooler can be constructed easily by installing a cooling jacket outside the microtube. In the cooler, the outside heat-transfer coefficient of the tube can be raised by increasing the flow of cooling water. Also, during cooling, the temperature difference can be set larger than in heating, and therefore it is not difficult to achieve relatively large rate of heat transfer.3.3 Numbering up strategy and the establishment of high-pressure microengineeringAs an issue in realizing the microreactor, how to achieve the throughput increase is the major point. In the conventional chemical engineering, this is dealt by scaling up (such as increasing the size of the reaction container). In the microreactor, of course, such scaling up cannot be done because we want to utilize the advantage of being micro. Therefore, the parallelization approach (numbering up) is selected. However, an ordinary microreactor has small throughput per basic structure, and in many cases a realistic parallel number cannot be obtained. In contrast, since the high-pressure microreactor allows pressure drop to some degree, it has the advantage of raising the flow amount per basic structure. The high-pressure microheater described above can process maximum of 5 kg/h per microtube (inside diameter of 0.25 mm, outside diameter of 1.6 mm, length of 200 mm). Maintaining this high-pressure structure, the basic structure can be modularized (5 microtubes/module), and by parallelization of the module (4 modules/device), numbering up to 100 kg/h becomes possible. The concept of numbering up is shown in Fig. 9, and the photograph of the prototype numbering-up equipment is shown in Fig. 10. In this equipment, heating is done by direct energization method (12.5 kW/module × 4 modules), and cooling is done by circulating the cooling water in the jacket installed outside each module. As a result, we confirmed that the heat exchange performance Fig. 10 100 kg/h class microreactor plant (parallel operation of four-module system)The throughput was successfully increased while maintaining the heat exchange performance in single direct energization heating device.Fig. 11 Establishment of the high-pressure microengineeringFrom establishment of basic technology, configuration design and optimization of device and equipment, to the development of the application process.Tr. Tr. Tr. Tr. Tr. Tr. ParallelizationBasic structureModularization12.5 kW transformer × 4 = 50 kW100 kg/hExternalnumbering up25 kg/h12.5 kW transformerInternalnumbering up2.5 kW transformerHigh-pressuremicrotube5 kg/hFig. 9 Numbering up strategyThroughput increase is accomplished by modularization of the basic structure and the parallelization of the module.Direct energization heating moduleCooling module Diffusion bonding microdeviceDevelopment of application processSuper high-pressure supercritical water reaction processReaction equipment with direct energization heatingNumbering-upequipmentDirect energization microheaterStage 3Numbering-up modularizationHigh-pressure micromixerDirect energization microdeviceHigh-pressure micro bonding and structuring of metalsStage 0Stage 2Precise spatiotemporal controlRapid mixingRapid heat exchangeMicrotube fabrication (corrosion countermeasure)Design by CFD simulationStage 1Design and optimization of equipmentDesign and optimization of deviceBasic technologyDevelopment items

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