Enhancing Impeller Power Efficiency and Solid-Liquid Mass Transfer in an Agitated Vessel with Dual Impellers through Process Intensification

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Abstract

The effects of high volumetric solids concentration (CV), impeller type, and baffles on the impeller power input required for solids suspension and dispersion and the solid-liquid mass transfer coefficient (kSL) were studied in this work using an agitated vessel with dual impellers for the purpose of process intensification. It was found that at CV = 0.2 (v/v), the impeller power consumption required for solids suspension per unit mass solids (εJS = PJS/MS) is minimized while at the same time achieving maximum kSL values. Overall, it was observed that process intensification could be achieved using two radial flow impellers in a taller vessel under unbaffled conditions. A case study highlighting the benefits of adopting some of this study's recommendations is presented. Mathematical correlations proposed to estimate εJS, impeller power consumption for solids dispersion, and kSL as a function of CV were found to fit experimental data reasonably well.

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Stoian, D., Eshtiaghi, N., Wu, J., & Parthasarathy, R. (2017). Enhancing Impeller Power Efficiency and Solid-Liquid Mass Transfer in an Agitated Vessel with Dual Impellers through Process Intensification. Industrial and Engineering Chemistry Research, 56(24), 7021–7036. https://doi.org/10.1021/acs.iecr.7b00435

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