Industrial draft tube baffle (DTB) crystallizers are well known and can be found in many applications; however, DTBs are rarely investigated on the laboratory scale. A miniaturized DTB for continuous cooling crystallization with integrated fine-grain dissolution was designed, set up, and characterized. A typical DTB from the m³-scale was scaled down to 2 L filling volume to enable lab-scale investigations concerning process development. The fluid dynamic behavior was determined with suspension performance and residence time of the liquid and solid phase. Five different start-up variations were investigated for cooling crystallization of l-alanine dissolved in water. Hurdles with the periphery were identified, different start-up variations were tested, and the promising ones were determined. It was found that the residence time of the solid phase is shorter than the liquid phase due to the classifying behavior of the DTB, i.e., the crystal residence time could be shortened by decreasing the stirrer speed. The investigations show the potential of the miniaturized DTB for the process development of continuous procedure and small-scale production.

工业导流管挡板 (DTB) 结晶器是众所周知的，可以在许多应用中找到；然而，很少在实验室规模上研究 DTB。设计、设置和表征了一种用于连续冷却结晶的小型化 DTB，具有集成的细晶粒溶解。一个典型的 m³ 级 DTB 被缩小到 2 L 的填充体积，以实现有关工艺开发的实验室规模研究。流体动力学行为由悬浮液性能和液相和固相的停留时间决定。为冷却结晶l研究了五种不同的启动变化- 溶于水的丙氨酸。确定了外围障碍，测试了不同的启动变量，并确定了有希望的变量。发现由于DTB的分级行为，固相的停留时间比液相短，即可以通过降低搅拌速度来缩短晶体停留时间。调查显示了小型化 DTB 在连续程序和小规模生产的工艺开发方面的潜力。