Tsukishima Kikai Co., Ltd. Product Lineup

**Principle** This is a crystallization device that employs a unique DP (Double Propeller) blade with counter-rotating inner and outer blades installed inside and outside the draft tube. This integrated blade (double propeller) simultaneously creates an upward flow (inside) and a downward flow (outside) in the draft tube, achieving an ideal mixing state in industrial crystallization characterized by "large circulation volume at low rotational speed." **Features** Large Circulation Volume A good mixing state is formed within the device, allowing for a uniform operating supersaturation, which results in the production of high-quality crystals. Additionally, since local supersaturation is less likely to occur, it is possible to suppress the generation of microcrystals and scaling. Sharp Particle Size Distribution Due to the low rotational speed, there is a high suppression effect on nucleation. Furthermore, by adjusting the rotational speed of the double propeller, the circulation volume within the tank can be changed arbitrarily, allowing for adjustment to the desired operating supersaturation. This enables the production of crystals with a sharp particle size distribution, ranging from large to small diameters. High Reliability in Scale-Up Since the operating supersaturation is used as the scale-up factor, reliable and easy scale-up is ensured.

**Principle** By circulating a large volume of reaction liquid, a powerful vortex flow field is formed within the reactor. By continuously feeding raw materials into this vortex flow field, uniform reaction crystallization throughout the entire reactor is made possible, enabling the production of fine particles through continuous crystallization. **Features** Fine and sharp particle size distribution It is possible to continuously produce fine particles with a small particle diameter (around a few micrometers) and a sharp particle size distribution (good monodispersity). High productivity per unit volume The device capacity can be reduced through continuous production (approximately 1/5 to 1/10 compared to conventional stirred tanks). Others Short startup time. The unit structure allows for easy scale-up through numbering up, and the simple internal structure makes disassembly and cleaning easy.

**Principle** By circulating a large volume of reaction liquid, a powerful vortex flow field is formed within the reactor. By continuously feeding raw materials into this vortex flow field, uniform reaction crystallization throughout the entire reactor is made possible, enabling the production of fine particles through continuous crystallization. **Features** Fine and sharp particle size distribution It is possible to continuously produce fine particles with a small particle diameter (around a few micrometers) and a sharp particle size distribution (good monodispersity). High productivity per unit volume Continuous production allows for a reduction in equipment capacity (approximately one-tenth to one-twentieth compared to conventional stirred tanks). Others Short startup time. The unit structure allows for easy scale-up through numbering up, and the simple internal structure facilitates easy disassembly and cleaning.

**Principle** This is a batch-type crystallizer mainly used in the sugar refining process. After supplying a refined sugar solution (syrup), the heating pipes installed inside the crystallizer are heated with steam. This heating section is called the calandria. The sugar solution is evaporatively concentrated while circulating through the heating pipes and down-take due to thermal circulation and agitation. When the concentration of the syrup progresses and reaches a predetermined level, fine sugar known as seed crystals is supplied. The crystallizer continues to evaporatively concentrate while adding syrup, allowing the sugar crystals to grow to the desired size. **Features** Efficient sugar boiling operation A specially designed marine-type stirring blade is installed in the down-take at the center of the calandria. By planning and designing the rise velocity of the syrup inside the heating pipes, the number of heating pipes, and the specifications of the stirrer according to the operating conditions (syrup, utilities, installation location, product), efficient sugar boiling operations can be achieved. Improved production efficiency and energy savings By installing a fully automatic sugar boiling device and implementing sugar boiling operations suitable for the target product, the sugar boiling cycle time can be shortened, resulting in improved production efficiency, energy savings, and enhanced product quality.

When considering the selection of models for the introduction of new equipment, we believe there are many aspects that need to be confirmed, such as whether the required capacity is suitable and if the desired performance can truly be achieved. Our company has numerous testing facilities to verify these aspects. If you request testing, we will conduct the tests in your presence, gather the necessary data for scale-up, and based on the results, we will propose appropriate model selection and equipment specifications. 【Features】 ■ Possession of various testing facilities ■ Conducting tests in the presence of customers ■ Gathering necessary data for scale-up ■ Proposing appropriate model selection and equipment specifications based on results *For more details, please refer to the PDF document or feel free to contact us.