Scale-up of Nanoparticle Synthesis by Flame Spray Pyrolysis: The High-Temperature Particle Residence Time

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• 作者：Arto J. Gr枚hn ; Sotiris E. Pratsinis ; Antoni S谩nchez-Ferrer ; Raffaele Mezzenga ; Karsten Wegner
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：July 2, 2014
• 年：2014
• 卷：53
• 期：26
• 页码：10734-10742
• 全文大小：449K
• ISSN：1520-5045

文摘

The scale-up of nanoparticle synthesis by a versatile flame aerosol technology (flame spray pyrolysis) is investigated numerically and experimentally for production of ZrO₂. A three-dimensional computational fluid dynamics model is developed accounting for combustion and particle dynamics by an Eulerian continuum approach coupled with Lagrangian description of multicomponent spray droplet atomization, transport, and evaporation. The model allows the extraction of the high-temperature particle residence time (HTPRT) that is governed by the dispersion gas to precursor liquid mass flow ratio as well as the flame enthalpy content. The HTPRT is shown to control the primary particle and agglomerate size, morphology, and even ZrO₂ crystallinity in agreement with experimental data. When the HTPRT is kept constant, the production rate for ZrO₂ nanoparticles could be scaled up from 100 to 500 g/h without significantly affecting product particle properties, revealing the HTPRT as a key design parameter for flame aerosol processes.