结晶
色散(光学)
人口平衡方程
塞流
体积流量
泥浆
材料科学
悬挂(拓扑)
粒度分布
Crystal(编程语言)
流量(数学)
机械
化学
粒径
人口
热力学
复合材料
物理
数学
光学
人口学
物理化学
程序设计语言
纯数学
社会学
计算机科学
同伦
作者
Lukas Hohmann,Thorsten Greinert,Otto Mierka,Stefan Turek,Gerhard Schembecker,Evren Bayraktar,Kerstin Wohlgemuth,Norbert Kockmann
标识
DOI:10.1021/acs.cgd.7b01383
摘要
Continuous processing gains importance in the fine chemical and pharmaceutical industries where crystallization is an important downstream operation. Seeded cooling crystallization of the l-alanine/water system was investigated under similar conditions, i.e., temperature interval, cooling rate, and seed material, both in a stirred batch vessel and in a continuous plug flow crystallizer in the coiled flow inverter (CFI) design with horizontal helical tube coils (ID = 4 mm) and frequent 90° bends of the coils. Short-cut calculations based on characteristic time scales and the Damköhler number allow for comparing the batch and continuous crystallization processes. The experimental results reveal crystal growth and growth rate dispersion to be dominating on the product crystal size distribution (CSD). However, at low flow rates of approximately 31 g min–1, a moving sediment flow of the slurry was present in the CFI crystallizer, resulting in further size dispersion effects. Elevated flow rates of approximately 40 g min–1 resulted in a more homogeneous suspension flow and a product CSD comparable to batch quality. Simulation studies based on a population balance equation model strengthen the hypothesis of the solid phase residence time distribution (RTDS) to be more spread in the moving sediment flow regime, leading to a wider product CSD.
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