The Agitator/Stirrer Assembly is a mechanical component used in crystallization vessels within the chemical manufacturing industry. It consists of a motor-driven shaft with attached impellers or paddles that rotate to create fluid motion. This assembly ensures uniform temperature distribution, prevents localized supersaturation, promotes nucleation and crystal growth, and maintains suspension of solid particles during the crystallization process. The assembly is driven by an electric motor that transmits torque through a shaft to impellers submerged in the crystallization solution. As the impellers rotate, they create fluid shear and circulation patterns that mix the solution, distribute heat evenly, prevent crystal settling, and control crystal size distribution through controlled agitation intensity. Materials on file include Stainless Steel 316L and Hastelloy C-276. Key parameters include shaft diameter (50–100 mm, ISO 286), impeller diameter (400–1200 mm), agitator speed (50–300 rpm), motor power (5.5–45 kW, IEC 60034), operating temperature (-10–150 °C), operating pressure (1.0–1.6 MPa), shaft runout (≤0.05 mm, ISO 1101), impeller balance grade (G6.3, ISO 1940-1), material grade (316L, ASTM A240), surface roughness (Ra ≤0.8 µm, ISO 1302), ingress protection (IP54–IP65, IEC 60529), and weight (150–800 kg). These values are reference ranges for directory purposes and must be confirmed for the specific model and application. The assembly is designed for use in crystallization processes where controlled agitation is critical. Selection inputs include vessel volume, fluid viscosity, desired crystal size, and process conditions. Interfaces include the motor, shaft seal, and vessel mounting. Verification questions should address material certification, dimensional compliance, and performance testing. Maintenance signals include increased vibration, seal leakage, or reduced mixing efficiency. Failure boundaries include exceeding operating temperature or pressure limits, which can compromise seal integrity and material strength.
The assembly is driven by an electric motor that transmits torque through a shaft to impellers submerged in the crystallization solution. As the impellers rotate, they create fluid shear and circulation patterns that mix the solution, distribute heat evenly, prevent crystal settling, and control crystal size distribution through controlled agitation intensity.
