Application of Wet Milling-Based Automated Direct Nucleation Control in Continuous Cooling Crystallization Processes

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• 作者：Yang Yang ; Liangcheng Song ; Yuqi Zhang ; Zoltan K. Nagy
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：May 4, 2016
• 年：2016
• 卷：55
• 期：17
• 页码：4987-4996
• 全文大小：781K
• 年卷期：0
• ISSN：1520-5045

文摘

A novel wet milling-based automated direct nucleation control (WMADNC) concept is proposed and implemented in two continuous cooling crystallization processes in this work. In process 1, WMADNC is implemented upstream to provide closed-loop controlled primary nucleation kinetics and produce seed crystals in situ for continuous mixed suspension mixed product removal crystallizer (MSMPRC). In process 2, WMADNC is applied downstream to achieve closed-loop controlled secondary nucleation kinetics and reduce particle size for crystals in the MSMPRC through recycling. For both processes, a focused beam reflectance measurement (FBRM)-based closed-loop control approach is successfully implemented to control the nucleation kinetics inside the wet mill therefore to control the final chord length distribution (CLD). In the proposed WMADNC approach, the process critical quality attributes (CQA) (e.g., particle number or size) can be directly controlled by the automated closed-loop control framework, which on one hand is aligned with the quality-by-design (QbD) concept, and on the other hand also applies the new quality-by-control (QbC) framework in continuous crystallization processes. Although the proposed WMADNC approach was not able to improve startup dynamics, it can provide high quality control of CLD and automated and effective disturbance rejection for continuous cooling crystallization processes.