Product Introduction

　　 Melt crystallization equipment It is a high-purity separation and purification device based on the principle of “solid-liquid equilibrium.” At its core, it employs a technology that combines “directional crystallization of molten materials with impurity removal.” By precisely controlling the cooling rate and the crystallization process, the target components are allowed to form high-purity crystals, while impurities remain in the molten mother liquor, thus achieving effective separation. The device boasts key advantages—high purification purity, low operating temperature, no need for solvents, and environmental friendliness—and is widely used in the preparation of high-purity materials across industries such as chemical engineering, pharmaceuticals, fine chemicals, and new energy. It is particularly well-suited for purifying heat-sensitive substances, azeotropic systems, and difficult-to-separate mixtures. The crystallizer structure and process parameters can be customized according to the specific properties of the feedstock (such as melting point, viscosity, and purity requirements), enabling ultra-high-purity purification ranging from 99.9% to 99.999%.

Product Category

　　According to the crystallization method, equipment structure, and application scenarios, melt crystallization equipment is mainly categorized as follows:

　　1. Classified by crystallization method

　　 ▪ Static melt crystallization equipment: The crystallization-melting process is carried out in a stationary state of the material, featuring a simple structure and making it suitable for small-scale laboratory purification or the handling of high-value materials (such as pharmaceutical intermediates).

　　 ▪ Dynamic melt crystallization equipment: Material flow is achieved through stirring, wall-scraping, or forced circulation, ensuring high crystallization efficiency and uniform heat transfer, making it suitable for large-scale industrial production (capacity: 50 kg/h to 10 t/h).

　　 ▪ Directional Solidification and Melting Crystallization Equipment: Gradient cooling is employed to achieve directional crystal growth, delivering optimal impurity separation and enabling ultra-high-purity purification exceeding 99.99%. This process is well-suited for semiconductor materials and high-end chemical feedstocks.

　 　2. Classified by Equipment Structure

　 　▪ Batch melt crystallizer: Batch operation, with individual reactor volumes ranging from 0.1 m³ to 10 m³; compact structure and flexible operation, ideal for purifying multiple varieties of materials in small batches.

　 　▪ Tubular melt crystallizer: Continuous operation, featuring a tube-in-tube or jacketed structure, where crystals form a crystallization layer on the tube walls, ensuring high heat transfer efficiency and making it suitable for large-scale continuous production.

　 　▪ Tower-type melt crystallizer (suspension bed type): The material undergoes crystallization in a suspended state, ensuring thorough contact between the crystals and the mother liquor, resulting in high purification efficiency. This process is particularly suitable for high-viscosity materials or large-capacity applications.

　 　3. Classified by process flow

　 　▪ Single-crystal type: Purification is achieved through a single crystallization-melting cycle, featuring a simple structure and low investment costs, making it suitable for preliminary purification (with purity requirements below 99.5%).

　　 ▪ Multiple recrystallization type: Through 2–5 cycles of crystallization-melting, trace impurities are gradually removed, achieving a purity level of over 99.99% and making it suitable for applications requiring ultra-high purity.

　 　▪ Continuous multi-stage melt crystallization system: Multiple crystallizers are connected in series to achieve continuous operation for crystallization, sweating, and melting. This setup ensures stable production capacity and high purification efficiency, making it well-suited for large-scale industrial production.

Performance Features

　 　1. Extremely high purity: Through directional crystallization and sweating processes, ultra-high-purity purification ranging from 99.9% to 99.999% can be achieved—surpassing traditional separation techniques such as distillation and extraction. This method is particularly well-suited for removing trace impurities (with impurity levels reduced to below the ppm level).

　 　2. Mild operating conditions: The crystallization temperature is close to the material’s melting point (typically ranging from -50℃ to 200℃), significantly lower than the boiling point temperatures used in distillation processes, thereby effectively preventing thermal-sensitive materials from decomposing or oxidizing and safeguarding product performance.

　 　3. Green and environmentally friendly, zero pollution: No organic solvents or separation agents need to be added—separation is achieved solely through thermal energy, with no wastewater or exhaust gas emissions. The mother liquor can be recycled and reused, fully complying with environmental protection policies.

　　4. Low energy consumption and cost-effective: Energy consumption is only 1/3 to 1/5 of that required by distillation processes; no vacuum system or high-pressure equipment is needed, resulting in low operating costs. The equipment has a simple structure with no vulnerable components, leading to significantly lower maintenance costs compared to conventional separation equipment.

　 　5. Wide compatibility: It can handle a wide variety of materials, including organic compounds (such as aromatics, fatty acids, and alcohols), inorganic compounds (such as salts and elemental metals), and polymer material intermediates. It is compatible with heat-sensitive substances, azeotropic systems, and difficult-to-volatilize mixtures, and also demonstrates excellent adaptability to high-viscosity materials (up to 1000 mPa·s).

　 　6. Stable and controllable operation: Equipped with a precise temperature-control system (temperature control accuracy ±0.1℃), the device allows flexible adjustment of parameters such as cooling/heating rates and crystallization time, ensuring stable product purity. The continuous-operation equipment can run continuously for 24 hours without interruption, with minimal fluctuations in production capacity.

　 　7. Excellent product quality: The crystallized product boasts uniform purity, no residual solvents, and well-defined crystal morphology, making subsequent processing—such as drying and shaping—convenient and efficient. It is particularly well-suited for applications with extremely high product quality requirements, such as pharmaceuticals and electronic-grade materials.

Application scenarios

　　Melt crystallization equipment, with its core advantages of high-purity purification and environmental friendliness, is widely used in the following industries:

　　 1. Fine Chemical Industry: Aromatic hydrocarbon purification (e.g., p-xylene, o-xylene, naphthalene), fatty acid separation (e.g., stearic acid, palmitic acid), alcohol purification (e.g., ethylene glycol, propylene glycol), and ketone separation (e.g., acetone, cyclohexanone);

　 　2. Pharmaceutical Industry: Purification of pharmaceutical intermediates (such as ibuprofen intermediates and antibiotic side chains), refining of active pharmaceutical ingredients (such as vitamins and hormones), and resolution of chiral compounds (such as separation of amino acid enantiomers);

　 　3. New Energy Industry: Purification of lithium battery materials (such as dimethyl carbonate and lithium hexafluorophosphate), preparation of photovoltaic materials (such as purification of polycrystalline silicon and organic photovoltaic intermediates), and purification of hydrogen storage and transportation materials (such as refining raw materials for hydrogen-storage alloys);

　 　4. Electronic chemicals industry: Purification of semiconductor materials (such as high-purity silicon, germanium, and gallium arsenide); preparation of electronic-grade solvents (such as high-purity isopropyl alcohol and electronic-grade acetone); refining of photoresist raw materials (such as photoresist monomers and resins).

　 　5. Other fields: Purification of food additives (such as high-purity sucrose and maltitol), refining of specialty plastic monomers (such as bisphenol A, the monomer for polycarbonate), and recovery and purification of precious metals (such as refining rare metals like platinum, palladium, and rhodium).