Mixing is an extremely important part of the chemical process industry, and is necessary in almost every chemical process. If mixing is not present among the reacting species of a process, no or little reaction will take place. Although it is not addressed in depth in most engineering curricula, the determination of the correct type, geometry, and size of mixers and/or impellers to be used for a specific process is an integral part of reactor design. We will limit our discussion of mixers here to some common correlations used and different types of impellers.
When dealing with mixing processes, it is important to know that there is no standard mixer which will work best in any given process. Each process is unique and different impellers and tank geometries must be experimented with to determine the best design for a given situation.

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