Core Functionality Overview
Specifically designed for the high-efficiency, large-scale purification of PMMA pyrolysis liquid, the Continuous Vacuum Distillation Column for PMMA employs advanced continuous vacuum distillation technology. Under stable operating conditions, it continuously yields an MMA monomer solution with a purity of 96% or higher. The system integrates a fully automated PLC intelligent control platform, enabling uninterrupted 24/7 operation; it is ideally suited for industrial production environments with an annual processing capacity of 10,000 tons or more, significantly enhancing both production capacity and energy efficiency.
Process Flow and Key Operations
1. Continuous Feeding and Establishment of Vacuum Steady State
Crude liquid MMA from the pyrolysis process is fed continuously and steadily into the middle section of the distillation column via a metering pump.
The system is equipped with a high-efficiency liquid-ring vacuum unit to maintain the operating pressure within the column at 10–50 kPa (absolute pressure), thereby ensuring the boiling point of MMA remains stable between 60°C and 80°C.
The column reboiler and overhead condenser work in tandem to establish a stable temperature gradient.
2. Dynamic Reflux Ratio Optimization and Product Draw-off
Once vapor-liquid equilibrium is rapidly established during the initial phase, the system automatically switches to a preset reflux ratio mode.
The overhead condensate is analyzed in real-time using an online gas chromatograph; when the purity reaches ≥96%, the stream is automatically diverted to the purified monomer storage tank.
Should any fluctuations in impurity levels be detected, the system immediately adjusts the reflux ratio or pauses the product draw-off to ensure consistent product quality.
3. Continuous Discharge of Heavy Components and System Self-Stabilization
High-boiling heavy components accumulating in the column sump are discharged into a residue tank at scheduled intervals and in controlled quantities via a continuous residue discharge valve.
The system incorporates nitrogen blanketing and low-temperature discharge designs to effectively mitigate the risk of MMA polymerization at elevated temperatures.
Pressure fluctuations throughout the entire process are maintained within a tolerance of ±0.5 kPa, thereby guaranteeing long-term operational stability.
Core Advantages
Ultra-High Throughput and Energy Efficiency
Annual processing capacity reaches 10,000–50,000 tons of pyrolysis liquid, far exceeding that of batch-mode equipment;
Vacuum operation lowers heating temperatures by 20–40°C, reducing steam consumption by over 30% compared to atmospheric distillation, resulting in annual energy cost savings exceeding one million RMB.
Ultimate Safety and Reliability
Operates under fully enclosed negative pressure, completely eliminating the risks of MMA vapor leakage and spontaneous polymerization;
Key components are equipped with temperature and pressure interlock protection systems, ensuring compliance with relevant safety standards.
Fully Automated Intelligent Control
Features a dual-redundant PLC+DCS control system, supporting remote monitoring and data traceability;
Adaptive algorithms dynamically compensate for fluctuations in feed concentration and flow rate, maintaining a product purity standard deviation of <0.5%.
Low Maintenance and Extended Run Cycles
The distillation column utilizes anti-clogging structured packing, enabling continuous operation cycles of ≥6 months;
Cleaning and maintenance intervals are extended to 12–18 months, significantly reducing labor and downtime costs.
Flexible Adaptability to Diverse Feedstocks
Capable of processing PMMA pyrolysis liquids from various sources (including recycled waste plastics, industrial scraps, laboratory pyrolysis products, etc.), demonstrating high tolerance for fluctuations in feedstock composition.
Applicable Scenarios
- Large-scale PMMA recycling and regeneration plants
- Centralized distillation centers within chemical industrial parks
- As a supporting facility for downstream polymerization units requiring stable, 24/7 feedstock supply.
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