【摘要】 实验研究了半连续结晶器中混合特性与化学特性对反应结晶过程的影响,实验发现,混合特性对产物粒度分布的影响是非单调的,存在转捩点(criticl point),在该点平均粒径或方差为极小。分析表明,转捩点的出现是微观混合与宏观混合共同作用达到平衡的结果。更多还原

【Abstract】 The efffects of mixing characteristics and chemical characteristics on the precipitation process conducted in a semi-batch stirred tank were investigated and analysed. It was found that there existed critical points of stirrer speed Nc, viscosity μc and feed time tfc, at which the mean size and the variance of particle size distribution (PSD) were minimal. This fact could be attributed to the interaction of micromixing and macromixing and was vital to industries such as the manufacturing of ultra-fine particles and catalysts. Experimental results also showed that the feed location possessed great effects on PSD and critical stirring speed Nc. Generally, smaller values of Nc would be achieved when the feed location was put nearer to the impeller.更多还原