Catalyst Slurry Mixing with Multi-Blade Impeller

The mixing system is divided into multiple mixing vessels arranged in series, with each vessel performing a specific mixing function. The catalyst slurry passes through multiple stages of mixing, allowing progressive homogenization without requiring an overly complex single-vessel system. This segmentation achieves uniform catalyst distribution while keeping individual vessel designs relatively simple.

The patent introduces a vertical dimension to the mixing process by using multiple mixing vessels stacked or arranged in sequence, rather than relying solely on horizontal mixing within a single vessel. This multi-stage approach in the vertical dimension enhances mixing efficiency and catalyst concentration uniformity without significantly increasing the complexity of individual mixing components.

The catalyst slurry is prepared and pre-mixed in the mixing vessels before being introduced to the polymerization reactor. This preliminary mixing action ensures that the catalyst is uniformly distributed and at the desired concentration, allowing the reactor to maintain better temperature control and product consistency even when operating at high productivity levels. The pre-mixing prevents localized concentration spikes that would otherwise cause temperature runaway.

The mixing vessels act as intermediaries between catalyst storage and the polymerization reactor. They buffer and regulate the catalyst delivery, ensuring steady-state concentration in the reactor feed. This intermediary function allows the system to maintain reliable temperature control and polyolefin property consistency while supporting high productivity by decoupling the catalyst storage system from the reactor operation.

The mixing vessels are designed for continuous operation, with catalyst slurry flowing continuously through multiple mixing stages. This continuous mixing action maintains consistent catalyst concentration without requiring prolonged stopping or extensive mixing time. The multi-vessel series arrangement allows overlapping mixing operations, where while one vessel is being filled, another is being mixed, thereby reducing overall mixing time while maintaining polyolefin property consistency.

The system optimizes mixing parameters such as impeller speed, residence time in each vessel, and flow rates to achieve effective mixing in minimal time. By carefully controlling these parameters across the multiple vessels, the system maintains consistent catalyst concentration and polyolefin properties without excessive mixing time or energy consumption. The parameter optimization allows rapid mixing while preserving product quality.