Spatial precipitate separation enhanced by complex formation
The separation of inorganic precipitates with similar solubility products is a challenging task in chemical engineering. We present a computational fluid dynamics study of a precipitation reaction in a flow-driven reactor. For a reference study, the cobalt(II)-copper(II)-oxalate system is selected,...
Elmentve itt :
| Szerzők: | |
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| Dokumentumtípus: | Cikk |
| Megjelent: |
2022
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| Sorozat: | CHEMICAL ENGINEERING SCIENCE
261 |
| Tárgyszavak: | |
| doi: | 10.1016/j.ces.2022.117955 |
| mtmt: | 33169951 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/25601 |
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| 520 | 3 | |a The separation of inorganic precipitates with similar solubility products is a challenging task in chemical engineering. We present a computational fluid dynamics study of a precipitation reaction in a flow-driven reactor. For a reference study, the cobalt(II)-copper(II)-oxalate system is selected, where precipitation occurs simultaneously and the difference in solubility is within an order of magnitude as shown experimentally. For general description of two metal ions competing for one common anion, several parameters have been varied to identify the factors responsible for spatial separation. Two new quantities, the mean position of sedimented particles and the precipitation excess, are introduced to characterize the extent of separation. The calculations have shown that complex formation prior to nucleation makes the separation feasible for a wide range of thermodynamic or kinetic parameters. The injection rate can be used for fine tuning both the amounts of precipitate and their spatial separation when complexes are present. (C) 2022 The Author(s). Published by Elsevier Ltd. | |
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