The chemical industry has the most varied and some of the most complex mixing requirements. Often, the mixer must be able to handle a combination of many mixing duties. High viscosity can also complicate the design, especially if it involves gas dispersion.
Changes in viscosity during the mixing process will require a sophisticated mixer, often hybrid impeller systems designed specifically for their duties. High viscosity and heat transfer we often utilize combinations of specialist high solidity and helix impellers driven by contra rotating drives.