Double-Feed Semibatch Precipitation Effects of Mixing
Double-Feed Semibatch Precipitation Effects of Mixing
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DOI：
10.1205/cherd06177
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发表时间：
2007
影响因子：
3.9
通讯作者：
J. Bałdyga;Ł. Makowski;W. Orciuch
中科院分区：
文献类型：
--
作者：
J. Bałdyga;Ł. Makowski;W. Orciuch
试剂的混合方式对固体产物的大小分布和形态有显著影响。降水过程可以非常快，甚至通常是湍流混合序列中最快的微混合过程也会影响降水过程和降水产品的质量。在双进料沉淀过程中，混合效果特别高。采用非平衡多时间尺度混合模型和混合分数的beta分布，结合基于局部瞬时反应物浓度值线性插值的简单条件矩闭，对双进料半批搅拌槽式反应器中BaSO4的沉淀过程进行了建模。混合、成核和晶体生长在进料区使用CFD模拟，而晶体的成核和生长在散装中使用半批混合槽的简单概念进行模拟。模型预测了实验中观察到的所有趋势。
Abstract The way in which reagents are mixed can affect significantly the size distribution and morphology of the solid product. The process of precipitation can be so fast that even the micromixing process that is usually the fastest of the turbulent mixing sequence can affect the course of precipitation and the quality of precipitation product. Effects of mixing are particularly high in the case of the double-feed precipitation process. The process of BaSO4 precipitation in a double-feed semibatch stirred tank reactor is modelled using a non-equilibrium multiple-time-scale mixing model and a beta distribution of the mixture fraction in combination with a simple conditional moment closure based on linear interpolation of local instantaneous reactant concentration values. Mixing, nucleation and crystal growth are modeled in the feed zone using CFD, whereas nucleation and growth of crystals in the bulk are simulated using a simple concept of the semibatch well-mixed tank. Modelling predicts all trends observed in experiments.