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Facts at your Fingertips: High-Shear Mixing

By Christine Banaszek, Charles Ross and Son |

High-shear, high-speed mixing equipment supplies the mechanical energy necessary to reduce the size of solid particles and liquid droplets in emulsions and dispersions. Emulsions are mixtures of two normally immiscible liquids in which tiny particles of one liquid are suspended in another. Dispersions refer to solid particles distributed uniformly throughout a continuous medium. High-shear mixing processes are common across the chemical process industries (CPI), including in foods, cosmetics, pharmaceuticals, greases and lubricants, specialty chemicals, paints, inks and others. This one-page reference provides information on high-shear mixing operations and equipment. Rotor-stator mixers Rotor-stator mixers are standard workhorses used throughout the CPI for preparing fine dispersions and emulsions. The traditional design features a four-blade rotor running at tip speeds in the range of 3,000–4,000 ft/min within a close-tolerance fixed stator. The mixer creates mechanical and hydraulic shear by continuously drawing product components into the rotor and expelling them radially through the openings in the stator. Rotor-stator mixing devices are offered in both batch and inline configurations. Multi-stage designs are also available.…
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