By Wolfgang Ehrfeld, Volker Hessel, Holger Löwe
Tiny units with large potential!
New ideas of chemical synthesis have resulted in an expanding call for for miniaturization and extra complicated structures. Microreaction expertise is a scorching subject because it opens thoroughly new percentages for chemical engineering, combinatorial chemistry, and biotechnology. Small, reasonably cheap, self reliant, and flexible units make sure many reactions in achieving greatest selectivity, minimal waste, minimal funding, a greater regulate of the method, secure manufacture and construction on call for - to create a extra effective process.
This ebook outlines the fabrication innovations of microfluidic parts, unit operations of micro-chemical engineering and present world-wide actions. requisites with appreciate to wishes of the chemical were included.
Chemists, chemical engineers, biotechnologists, procedure engineers, microsystem technologists within the chemical and pharmaceutical and academia, in addition to brands of analytical tools, will locate this e-book a state-of- the-art evaluation of this super attention-grabbing and swiftly constructing box.
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Extra info for Microreactors. New Technology for Modern Chemistry
Gruber, H. ; “Fabrication of microreactor components by electro discharge machining”, in Ehrfeld, W. ) Microreaction Technology, Proc. of the 1st International Conference on Microreaction Technology, pp. 158–168, Springer-Verlag, Berlin, (1997). ; “Simutaneous screening of catalysts in microchannels: methodology and experimental setup”, in Ehrfeld, W. ) Microreaction Technology: 3rd International Conference on Microreaction Technology, Proceedings of IMRET 3, pp. 260–266, Springer-Verlag, Berlin, (2000).
300 µm Fig. 2-14. Rod-like electrode for microdrilling EDM processes . 11 Laser Micromachining The central element of a liquid/liquid phase microreactor, a mixer/heat exchanger platelet was realized by using the rotating disc technique. In Figure 2-13 a fluidic test structure is shown which served to demonstrate the feasibility of fabricating such high-aspect ratio microstructures. 2 µ-EDM Drilling Another micro-EDM technique, called µ-EDM drilling, utilizes cylindrical electrodes of tungsten, hard alloys, tungsten/copper or brass with diameters between 10 µm and 100 µm, high speed electrode rotation (2000 rpm) and machine axis movement similar to conventional milling.
Scanning electron micrograph of an aluminum oxide layer generated on the surface of an aluminum containing iron alloy . 2 Functional Coatings for Fouling Prevention Fouling, in particular deposition of carbon layers from hydrocarbons, inside microchannels can pose severe problems by clogging of the fluid pathway, thereby increasing the pressure drop and potentially affecting the flow distribution. Moreover, the activity of catalyst surfaces may be notably reduced. Two principal approaches are likely to overcome fouling problems, namely generating extremely smooth surfaces or reducing the surface energy of construction materials.