Jiangsu Shuoyun Petrochemical Equipment Co., Ltd.

Product Features:

I. DTB Continuous Cooling Crystallizer
Product Features:
The DTB continuous cooling crystallizer removes heat via external heat exchangers. Sensible heat and heat of crystallization from the crystallization system are continuously removed by the heat exchanger to produce supersaturated solution. Supersaturation is released inside the crystallizer for crystal growth. Feeding, discharging and heat exchange run continuously. The material temperature inside the crystallizer is maintained steadily near the crystallization temperature.
Suspension of crystals and particle classification inside the crystallizer are typical characteristics of DTB continuous cooling crystallizers. The crystallizer achieves low nucleation rate. Crystals grow continuously under suspended state to obtain large-size products. Clarified mother liquor is continuously sent to external heat exchangers for cooling to reach supersaturation, then returned to the crystal suspension bed. As the supersaturated solution flows upward through the crystal bed, supersaturation gradually dissipates and crystals grow steadily. Upward mother liquor inside DTB crystallizer elutriates and classifies crystals: coarse crystals settle down while fine crystals float upward. Large crystals are preferentially harvested and filtered, and fine crystals remain to keep growing.
Multiple external coolers of the cooling-type DTB continuous crystallizer allow on-line cleaning and regeneration without shutdown. No valves are required on circulation pipelines; external coolers can be switched and cleaned on-line without stopping the system.
The continuous crystallization system realizes rapid cooling of high-temperature materials without massive fine crystal generation by fully utilizing solubility, metastable zone and supersaturation characteristics of different solutions as well as crystal growth principles. However, each continuous crystallization system designed for a specific material has poor cross-material versatility, so it is almost a relatively independent custom design.
Advantages of DTB continuous cooling crystallizer: continuous crystallization process, simple operation and low labor intensity. The continuous crystallizer occupies small footprint with low installation height and can be installed outdoors. Slurry circulation inside DTB crystallizer maintains low solution supersaturation, providing mild crystal growth environment favorable for producing large granular crystals.

Application Scope:
DTB continuous cooling crystallizer is applicable for common inorganic salts: sodium sulfate decahydrate, cobalt sulfate, nickel sulfate, copper sulfate, magnesium sulfate, zinc sulfate, ferrous sulfate, sodium thiosulfate, ammonium persulfate, ammonium chloride, cobalt chloride, potassium chloride, sodium nitrate, sodium bromide, sodium carbonate, monopotassium phosphate, dipotassium hydrogen phosphate, trisodium phosphate, potassium fluoride, and other organic products requiring freeze/cooling crystallization.

II. DTB Continuous Evaporative Crystallizer
Product Features:
The DTB continuous evaporative crystallizer is high-efficiency crystallization equipment. Equipped with an internal draft tube, it is also known as draft-tube crystallizer. Its operation is mainly controlled by PLC for material temperature, keeping solution supersaturation at a low level. It fits products with sharply fluctuating solubility curves. Its unique structure and working principle deliver high production intensity, large crystal grains, easy equipment cleaning, low scaling tendency, high heat transfer efficiency, simple configuration, convenient operation & control and favorable working environment. It is widely used for crystallization in chemical, pharmaceutical, pesticide and other industries, and is one of the mainstream continuous crystallizer types in the industry.

During crystallization of DTB continuous evaporative crystallizer, solution supersaturation, uniformity of material temperature, stirring speed and cooling area are decisive factors affecting crystal grain size and morphology. The equipment adopts special impellers. Adjustable temperature and stirring speed facilitate automatic system control to meet crystallization requirements of various materials.
The operating temperature of DTB continuous evaporative crystallizer can be set and controlled within 0℃~100℃ according to different process requirements. The crystallization circulation pump is installed inside the crystallizer with low resistance and low driving power. A jet pump is used to compress secondary steam for low energy consumption, only 40%~50% of batch crystallization. Baffles inside the crystallizer separate crystal growth zone and settling zone without mutual interference, yielding uniform and stable crystal grains, and crystal particle size can be controlled within a certain range.

Application Scope:
DTB continuous evaporative crystallizer is suitable for continuous crystallization processes of glutamic acid, monosodium glutamate, monohydrate citric acid, anhydrous citric acid, L-lysine hydrochloride, glucose VC, xylitol, potassium bicarbonate, ammonium chloride, etc. It also has broad application prospects in fine chemicals, pharmaceuticals, inorganic salts and other fields.