Solid-liquid mass transfer in an agitated ion exchange vessel fitted with dual impellers

Stoian, D, Eshtiaghi, N and Parthasarathy, R 2015, 'Solid-liquid mass transfer in an agitated ion exchange vessel fitted with dual impellers', in Asia Pacific Confederation of Chemical Engineering Congress 2015 (APCChE 2015), Melbourne, Australia), 27 September-1 October 2015, pp. 425-432.


Document type: Conference Paper
Collection: Conference Papers

Title Solid-liquid mass transfer in an agitated ion exchange vessel fitted with dual impellers
Author(s) Stoian, D
Eshtiaghi, N
Parthasarathy, R
Year 2015
Conference name Asia Pacific Confederation of Chemical Engineering Congress 2015 (APCChE 2015) incorporating CHEMECA 2015 /​ Institution of Chemical Engineers; Engineers Australia.
Conference location Melbourne, Australia)
Conference dates 27 September-1 October 2015
Proceedings title Asia Pacific Confederation of Chemical Engineering Congress 2015 (APCChE 2015)
Publisher ACT Engineers Australia
Place of publication Barton, Australia
Start page 425
End page 432
Total pages 8
Abstract Solid-liquid mixing in agitated vessels are widely utilised in industry where there has been a demand for process intensification. It has been shown that the impeller power required per unit mass solid (epsilon-js) to achieve just off-bottom solid suspension (Njs) is dependent on solids concentration as well as tank and impeller geometry. This study aims to investigate the effect of solids concentration on epsilon-js as well as the solid-liquid mass transfer coefficient (kSL) and explore the influence of baffles and impeller configuration on these parameters. Experiments were carried out in a 0.2 m diameter, cylindrical, flat bottom agitated vessel with a liquid height of 0.3 m and equipped with two 6-bladed Rushton turbines (RT/RT) or an A310 hydrofoil and a 6-pitch bladed turbine (A310/PBT). The solid and liquid phases used were cation exchange resin and aqueous NaOH, respectively. Experimental results showed that epsilon-js decreased with increasing solid concentration (CV) up to 0.20 (v/v) in all systems studied. The results also highlighted that when baffles were removed, epsilon-js values decreased for CV range of 0.05-0.35 (v/v) and that RT/RT systems required substantially less energy to achieve Njs than systems fitted with A310/PBT. This work also indicated that kSL increased with increasing CV up to 0.20-0.25 (v/v). Also, the removal of baffles did not adversely affect kSL with A310/PBT recording slightly higher kSL than RT/RT. These results imply that removing baffles in a RT/RT mixing vessel operating at 0.20-0.25 (v/v) can intensify existing processes when all other variables are held constant.
Subjects Chemical Engineering Design
ISBN 9781922107473
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