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Experimental investigation of a two-zone model for semi-batch precipitation in stirred-tank reactors

Rehage, H. 1; Nikq, F. 1; Kind, M. 1
1 Institut für Thermische Verfahrenstechnik (TVT), Karlsruher Institut für Technologie (KIT)

Abstract:

A zone model for the semi-batch precipitation process of sparingly soluble salts in stirred-tank reactors is presented. The low product solubility of these substances leads to high levels of supersaturation during the process. Consequently, nucleation and growth rates are fast and solids formation only takes place in a part of the reactor close to the feed pipe. The presented local mixing environment (LME) model extends an existing model for semi-batch processes, which consists of two zones. In the mixing zone, a steady-state plug-flow reactor (PFR) is used to imitate the local flow environment of the feed. The tank is approximated as a well-mixed storage tank outside the mixing zone. Exchange streams between the two zones are estimated by dimensional analysis considering stirrer type, size and rotational speed. The correctness of the two-zone hypothesis and the accuracy of the LME model is validated by barium sulfate precipitation in an experimental comparison setup using different stirrer types, rotational speeds and feed rates. The PFR is represented in the experiments as a pipe-in-pipe reactor in jet-in-cross-flow (JICF) or coaxial-flow (COAX) arrangement. ... mehr


Originalveröffentlichung
DOI: 10.1016/j.ces.2019.06.024
Scopus
Zitationen: 5
Web of Science
Zitationen: 4
Dimensions
Zitationen: 5
Zugehörige Institution(en) am KIT Institut für Thermische Verfahrenstechnik (TVT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2019
Sprache Englisch
Identifikator ISSN: 0009-2509
KITopen-ID: 1000096130
Erschienen in Chemical engineering science
Verlag Elsevier
Band 207
Seiten 258–270
Nachgewiesen in Dimensions
Web of Science
Scopus
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