In the production of methyl methacrylate (MMA) cast sheet, the high-temperature polymerization reaction in the boiling kettle yields a process-ready prepolymer. However, prolonged exposure to high temperatures can cause residual initiators to trigger further chain reactions. This may lead to uncontrolled viscosity increase, discoloration (yellowing), or even gelation and batch spoilage.
To solve this problem, we have developed the MMA Cooling Kettle. This key downstream unit, with a capacity matched to the boiling kettle (2–3 tons), is designed to rapidly cool the high-temperature MMA prepolymer to ambient temperature. Through efficient cooling and controlled agitation, it effectively "quenches" the polymerization reaction. This ensures the material remains chemically stable during subsequent storage, degassing, or casting processes.
Core Functions
- Receives high-temperature MMA prepolymer from the boiling kettle.
- Efficiently cools the entire batch to ambient temperature using standard industrial cooling water.
- Completely halts the polymerization reaction, preventing post-polymerization, runaway reactions, or viscosity drift.
- Provides a temperature-stable, consistent, and qualified slurry for vacuum degassing, filtration, and mold casting.
Key Specifications
|
Working Volume |
Acrylic cooling reactors are available in 2000 L / 2500 L / 3000 L sizes (fully matched with the front-end cooking vessel, processing capacity 2–3 tons). |
|
Cooling System |
Dual-circuit design (jacket + internal coil) using plant cooling water. Eliminates the need for dedicated chillers, reducing operational costs. |
|
Agitation System |
● Type: Propeller agitator. ● Speed Range: 0–130 rpm, with stepless variable frequency drive. Adapts to the cooling needs of low-viscosity monomer through to high-viscosity prepolymer. |
|
Construction |
S304 stainless steel with a mirror-polished interior. Corrosion-resistant, non-contaminating, and ensures optical-grade purity. |
|
Control System |
PLC-based automation for real-time temperature monitoring. Coordinates agitation speed and cooling water flow. Supports programmable cooling curves and endpoint temperature hold. |
Why Cool to Ambient Temperature?
MMA prepolymer retains significant polymerization activity above 50°C. Cooling to ≤35°C (room temperature) largely deactivates the initiator. This guarantees absolute stability during extended storage or before molding, preventing batch quality variations and the risk of total batch loss.
Key Advantages
Energy Efficient
Utilizes existing plant cooling water, requiring no additional refrigeration, for low operational costs.
Rapid & Uniform Cooling
Dual heat exchange circuits combined with high-speed agitation (up to 130 rpm) ensure efficient heat transfer and consistent temperature throughout the batch.
Process Flexibility
Wide agitation speed range accommodates different viscosity stages for optimal mixing and heat dissipation.
Safe & Reliable
Fully enclosed design with nitrogen inerting eliminates oxidation and spontaneous polymerization risks.
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