Flow Field of SAS During the Preparation of Al(NO<sub>3</sub>)<sub>3</sub> Nano-Particles

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Abstract This paper investigated the preparation of Al(NO₃)₃ spherical nano-particles with the supercritical antisolvent (SAS). At first experiments were carried out at temperature from 32 �� to 52 ��, pressure from 8 MPa to 24 MPa, and CO₂ flow rate from 30.0 g·min^-1 to 45.0 g·min^-1 in order to investigate their effect on the morphology and particle size (PS). The results showed that morphology of the nano-particles changed from spherical to non-spherical, and particle size decreased first and then increased with the increasing of temperature. Particles agglomeration became severe at 48 ��. When pressure increased, particle size decreased at first and then increased. Particle size reached the minimum at 16 MPa. The particle size exhibited a positive correlation with the CO₂ mass flow rate. The effecting mechanism of above factors was explored with CFD and was explained by the effective coefficient distribution in the precipitator. The CFD model for the injection in the precipitator is developed with the Realizable k-ε turbulent model. D_eff reflects both the changes of the thermodynamics and hydrodynamics of the system. The result is significant to precipitate particles with controllable particle size and morphology. Some of the above results can also be applied to other systems and can help to optimize the parameters.

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Keywords�� supercritical antisolvent (SAS)�� CFD�� Al(NO₃)₃ spherical nano-particles

Received 2013-04-23;

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Wang Zhaoya, Zhang Minhua, Geng Zhongfeng, Li Yonghui.Flow Field of SAS During the Preparation of Al(NO₃)₃ Nano-Particles[J] Chemcial Industry and Engineering, 2015,V32(2): 56-62

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