Abstract
To allow residence time control in a flow reactor, the mixing needs to be complete in a time shorter than the residence time. Mixing is eventually caused by molecular diffusion. The time required by molecular diffusion most greatly affects the mixing time, and the time required by molecular diffusion increases in proportion to the square of the diffusion distance. To allow fast mixing, the diffusion distance needs to be set short, but shortening the diffusion distance by mixing caused by stirring has limitations. A more effective way to shorten the diffusion distance is to make small solution segments by using a microstructure. A system consisting of a micromixer and a flow microreactor is effective in setting a short residence time and thus is essential for conducting extremely fast reactions in a controlled way (high-resolution reaction time control).
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