Precipitation of barium sulphate in a hollow fiber membrane contactor: Part II The influence of process parameters |
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Authors: | Roland Kieffer Denis Mangin François Puel Catherine Charcosset |
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Affiliation: | a Université de Lyon, F-69622, Lyon, France b Université Lyon 1, Villeurbanne, France c CNRS, UMR 5007, Laboratoire d’Automatique et de Génie des Procédés, France d ESCPE-Lyon, Villeurbanne, France |
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Abstract: | In this second of two papers, we investigated the influence of process parameters on BaSO4 particle precipitation in a hollow fiber membrane device. The solution of barium chloride was passed tangentially over the membrane surface and reacted with a solution of K2SO4 introduced through the membrane pores. The resulting supersaturation induced nucleation and particle growth on the lumen side of the hollow fibers. A specific technique was developed to measure crystal size directly at the outlet of the hollow fiber device by using EDTA as a neutralizing agent of crystal nucleation and growth. Concentrations of barium chloride and potassium sulphate were shown to influence mainly the CSD, the effect of inlet flow rates on the lumen and shell sides being less pronounced. The chemical conversions measured were between 3.7% and 20.5%. We propose improvements in the design of hollow fiber devices in order to give higher chemical conversions. |
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Keywords: | Barium sulphate Crystallization Membranes Membrane contactors Micromixing Mixing Precipitation |
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