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Fundamentals of High-Shear Dispersers

By Chemical Engineering |

Successful dispersion depends on a basic understanding of dispersion equipment and how dispersers should be used High-shear mixers typically operate at high rotational speeds and are used for mixing applications that are best described as dispersion processes. They can be used in a variety of applications, such as to speed additions, wet powders, break lumps and provide process intensification. Many dispersion problems are caused by incorrect use of equipment, when simple operational changes may give better results. While the inherent intensity of high-shear dispersers sometimes provides limited success even when they are misused, successful dispersion depends on a basic understanding of how the dispersers should be employed. This article focuses on the use of these dispersers during the addition of powders and liquids to liquids. Best practices for successful dispersion and the different types of dispersers are discussed.   Basic Principles The high rotational speeds of high-shear dispersers are often the motor speeds, including speeds at the electric power frequency. Most dispersers operate at a single speed, although some large dispersers may have variable speed control. The dispersions may be powder dispersions in a low-viscosity…
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