连续结晶技术研究进展
Development of continuous crystallization technology
结晶技术是化工和制药领域至关重要的分离纯化单元之一,相比于间歇结晶,连续结晶拥有生产规模更大、产品质量均一和投资与维护成本较低等优点。近年来,连续结晶技术已逐渐成为实现高效、灵活、可持续制药生产的关键技术。常用的连续结晶器主要分为以连续管式为主的平推流结晶器和以连续釜式为主的混合悬浮混合出料结晶器(MSMPRC)。连续管式结晶器拥有停留时间窄、产品粒径分布和粒径更均一的优势,而连续釜式结晶器则拥有不易堵塞、放大结构更为简单、操作便捷的优势。然而,由于缺乏标准化的小试连续结晶小试研究设备、下游间歇过滤干燥设备与上游不匹配以及小试研究过程中和小试结晶机理研究不准确等问题,目前连续结晶技术尚未得到大规模推广。随着过程分析技术和各类过程强化手段的耦合,连续结晶生产过程的放大难度也将逐渐降低,连续结晶技术必将在未来迅速发展并得到广泛应用。
Crystallization is one of the most important techniques for purification and separation in chemical and pharmaceutical industries.Compared to the batch crystallization,continuous crystallization owns advantages of large-scale production,uniform product quality,and low investment and maintenance cost.Currently,continuous crystallization has become a key pathway for achieving efficient,flexible and sustainable drug production.Commonly used continuous crystallizers are mainly classified into plug flow crystallizers (PFCs) based on continuous tubular systems and mixed suspension mixed product removal crystallizers (MSMPRCs) based on continuous stirred-tank systems.Continuous tubular crystallizers offer the advantages of narrow residence time distribution and more uniform crystal size distribution and product size.while continuous stirred-tank crystallizers are less prone to blockage,simpler to scale up,and easier to operate.However,due to the lack of standardized laboratory-scale continuous crystallization equipment,the mismatch between downstream batch filtration and drying equipment and upstream continuous operation,and inaccurate crystallization mechanism studies during laboratory-scale research,continuous crystallization technology has not yet been widely adopted.With the coupling of process analytical technology and various process intensification methods,the scale-up difficulty of continuous crystallization production will gradually decrease,and continuous crystallization technology is bound to develop rapidly and be widely applied in the future.
continuous crystallization / MSMPRC / plug flow crystallizer
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