Cyclone micromixers

Fig. 7.5 Cyclone micromixer. CFD predictions (left) and experimental patterns using a diffusion experiment [77],...

These are the devices in which fine dispersion occur because of high flow rates or static internals. Three types of mixers are available mixer-settler [4, 5], cyclone [6], and interdigital mixer [3] (see Figure 7.2). The principle of fluid contacting in micromixer-settler is almost similar to the conventional mixer-settler assembly. However, because of the reduced size of the equipment, the moving part of the mixer is replaced by the static. Two-fluid streams are introduced from the top of mixer and biphasic mixture is taken out from the top central line, which is further introduced to the mini-settler where the phases disengage based on their density... 

Figure 2.11 Schematic representation of fluid-fluid microstructured reactors (a micromixer settler b cyclone mixer c interdigital mixer d microchannel with partial overlap e microchannel with membrane or metal contactor f microchannels...

The selectivity of bromination of 1,3,5-trimethoxybenzene in a flow microreactor [8] depends on the total flow rate, when a less effective micromixer such as Swagelok T-mixer is used (Fig. 7.10). Monobromination product and dibromina-tion product are formed in almost 1 1 ratio at low flow rates. When a more effective micromixer such as IMVT cyclone mixer is used, the selectivity does not depend on the total flow rate and the highest monobromination/dibromination ratio of 100 is obtained. 

Another possibility is the manufacturing of full glass mixers. Multi-plate stacks of structured Foturan glass e.g. for an interdigital micromixer or a cyclone laminating micromixer were fabricated. 

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