Experimental and theoretical investigations of the coating of capsules with titanium dioxide
| Autor: | Jürgen Bertling, Peter J. Jansens, Jan Blömer, M. Sgraja |
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| Přispěvatelé: | Publica |
| Rok vydání: | 2010 |
| Předmět: |
Populationsbilanz
Materials science General Chemical Engineering Population Inorganic chemistry Population balance equation chemistry.chemical_element Beschichtung precipitation Titandioxid Industrial and Manufacturing Engineering chemistry.chemical_compound Environmental Chemistry education Hydrolyse education.field_of_study titanium dioxide Precipitation (chemistry) coating General Chemistry population balance hydrolysis Abscheidung Chemical engineering chemistry Titanium dioxide Particle Gravimetric analysis Particle size Titanium |
| Zdroj: | Chemical Engineering Journal. 160:351-362 |
| ISSN: | 1385-8947 |
| Popis: | Titanium dioxide is a ceramic material which is widely used as a white pigment and catalyst. In the present work the precipitation of TiO2 by the thermal hydrolysis of titanium oxysulphate was studied in terms of the homogeneous precipitation and the coating of capsules. Experimental work and simulations have been done to describe the precipitation in 0.1 M aqueous solutions while in some experiments sulphuric acid was added to increase the reaction time. In the experimental part of this work, gravimetric and spectroscopic measurements were performed to determine the time-dependent precipitation of the material and particle size measurements to characterize the time-dependent size distribution of the precipitated particles. In the theoretical part different mechanisms of the precipitation process like nucleation, growth and agglomeration were considered using semi-empirical equations. For the transfer of the effects of the individual particle scale to the whole population of particles population balance equations (PBEs), one for the colloidal and one for the deposited phase, were used. Finally, the theoretical results were compared to the experimental ones and the limitations of the model were discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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