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Processes 2018, 6(4), 32; https://doi.org/10.3390/pr6040032

Rotor-Stator Mixers: From Batch to Continuous Mode of Operation—A Review

1
Department of Food Technology, Engineering and Nutrition, Lund University, SE-221 00 Lund, Sweden
2
Department of Food and Meal Science, Kristianstad University, SE-291 88 Kristianstad, Sweden
Received: 16 March 2018 / Revised: 28 March 2018 / Accepted: 30 March 2018 / Published: 3 April 2018
(This article belongs to the Special Issue Feature Papers for Celebrating the Fifth Founding Year of Processes)
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Abstract

Although continuous production processes are often desired, many processing industries still work in batch mode due to technical limitations. Transitioning to continuous production requires an in-depth understanding of how each unit operation is affected by the shift. This contribution reviews the scientific understanding of similarities and differences between emulsification in turbulent rotor-stator mixers (also known as high-speed mixers) operated in batch and continuous mode. Rotor-stator mixers are found in many chemical processing industries, and are considered the standard tool for mixing and emulsification of high viscosity products. Since the same rotor-stator heads are often used in both modes of operation, it is sometimes assumed that transitioning from batch to continuous rotor-stator mixers is straight-forward. However, this is not always the case, as has been shown in comparative experimental studies. This review summarizes and critically compares the current understanding of differences between these two operating modes, focusing on shaft power draw, pumping power, efficiency in producing a narrow region of high intensity turbulence, and implications for product quality differences when transitioning from batch to continuous rotor-stator mixers. View Full-Text
Keywords: rotor-stator mixer; high shear mixer; inline; batch; continuous; emulsification; mixing rotor-stator mixer; high shear mixer; inline; batch; continuous; emulsification; mixing
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Håkansson, A. Rotor-Stator Mixers: From Batch to Continuous Mode of Operation—A Review. Processes 2018, 6, 32.

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