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Combined use of PEPT and ERT in the study of aluminum hydroxide precipitation / Iwan Edwards in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009)

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 1019–1028 Titre : Combined use of PEPT and ERT in the study of aluminum hydroxide precipitation Type de document : texte imprimé Auteurs : Iwan Edwards, Auteur ; Sean A. Axon, Auteur ; Mostafa Barigou, Auteur ; Hugh Stitt, Auteur Année de publication : 2009 Article en page(s) : p 1019–1028 Note générale : chemical engineering Langues : Anglais (eng) Mots-clés : Aluminum  Hydroxide--Study Résumé : The application of multimodal tomographic techniques to the in situ study of the semibatch precipitation of aluminum hydroxide, an industrially important alumina precursor, has been developed. For the first time Electrical Resistance Tomography (ERT) and Positron Emission Particle Tracking (PEPT) have been used concomitantly to study precipitation and hydrodynamics. This combination of techniques allows a step change in our ability to understand industrial precipitation processes. The semibatch precipitation of aluminum hydroxide was investigated in a stirred vessel operated with different configurations. Mixing conditions during semi batch precipitation have been shown to determine particle properties. Variables such as impeller design, power input, and feed location were used to provide different mixing conditions at the feed point where the reagents contact and precipitation takes place. The mixing performance during precipitation can be analyzed using ERT, with information of how the feed plume is dispersed under different mixing conditions. The flow conditions in the feed region can be characterized using PEPT. Together, the techniques can establish how the feed plume is dissipated into the bulk fluid. [article] Combined use of PEPT and ERT in the study of aluminum hydroxide precipitation [texte imprimé] / Iwan Edwards, Auteur ; Sean A. Axon, Auteur ; Mostafa Barigou, Auteur ; Hugh Stitt, Auteur . - 2009 . - p 1019–1028. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p 1019–1028 Mots-clés : Aluminum  Hydroxide--Study Résumé : The application of multimodal tomographic techniques to the in situ study of the semibatch precipitation of aluminum hydroxide, an industrially important alumina precursor, has been developed. For the first time Electrical Resistance Tomography (ERT) and Positron Emission Particle Tracking (PEPT) have been used concomitantly to study precipitation and hydrodynamics. This combination of techniques allows a step change in our ability to understand industrial precipitation processes. The semibatch precipitation of aluminum hydroxide was investigated in a stirred vessel operated with different configurations. Mixing conditions during semi batch precipitation have been shown to determine particle properties. Variables such as impeller design, power input, and feed location were used to provide different mixing conditions at the feed point where the reagents contact and precipitation takes place. The mixing performance during precipitation can be analyzed using ERT, with information of how the feed plume is dispersed under different mixing conditions. The flow conditions in the feed region can be characterized using PEPT. Together, the techniques can establish how the feed plume is dissipated into the bulk fluid.