Scaling-up the Production of Nanosized SiO2-particles in a Double Diffusion Flame Aerosol Reactor |
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Authors: | Kammler Hendrik K Pratsinis Sotiris E |
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Institution: | (1) Institut für Verfahrenstechnik, ETH Zentrum, Sonneggstrasse 3, 8092 Zürich, Switzerland |
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Abstract: | Synthesis of nanophase silica (SiO2) from hexamethyldisiloxane (HMDS) oxidation in a co-flow diffusion flame reactor at atmospheric pressure is investigated focusing on high production rates of powder. A new experimental set-up is introduced, including a diffusion burner which is operated with a ring-shape double diffusion flame. Significantly high HMDS concentrations are used resulting in SiO2 production rates of up to 130 g/h. Deposition of silica powder on the burner face is eliminated by the design of a special diffusion burner and higher collection rates are achieved using a baghouse filter. The specific surface area and the product powder composition are analyzed. Carbon black coated silica particles were produced at high production rates (130 g/h) at low oxygen flow rates or using a mixture of nitrogen and oxygen as oxidant. The size of the product particles was controlled in the range of 15–170 nm. |
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Keywords: | nanosized particles high production rates SiO2 double diffusion flame |
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