Composite Plastic Reprocessing via Fluidized Bed Filler Separation
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Solution Overview
Problem
Existing methods for recycling composite plastics with fillers, such as carbon fibers or inorganic materials, require additional steps to separate the filler from the fluidized material, leading to inefficiencies and increased costs.
Innovation Solution
A method and device for recycling composite plastic parts that involve crushing, depolymerizing polymers in a fluidized bed reactor, separating fillers based on similar material and size distribution, and discharging both filler and fluidized material together, eliminating the need for separate separation steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the filler is separated from the fluidized material in an additional process step, then the filler can be recovered, but the process complexity and time increase
Solution Approach 1:
The patent merges the filler separation function into the fluidized bed reactor itself by utilizing the fluidization process. The filler, being heavier than the polymer particles, naturally settles at the bottom of the reactor while the lighter polymer particles are carried upward by the fluidizing gas stream. This eliminates the need for separate filtration or separation equipment, as the reactor structure itself performs both reaction and separation functions.
Solution Approach 2:
The fluidized bed reactor is designed to perform multiple functions simultaneously: pyrolysis of the polymer, separation of filler from polymer particles, and discharge of the separated materials. The reactor serves as both the reaction vessel and the separation device, reducing overall system complexity while maintaining filler recovery capability.
2Manufacturing precision
If additional separation equipment is used to separate filler from fluidized material, then separation efficiency improves, but processing time increases
Solution Approach 1:
The separation of filler from polymer particles occurs during the fluidization process itself, before the materials are discharged from the reactor. The fluidizing gas stream continuously separates the lighter polymer particles from the heavier filler particles throughout the reaction process, so that by the time discharge occurs, the separation is already complete. This eliminates the need for subsequent separation steps.
Solution Approach 2:
The fluidized bed reactor maintains continuous fluidization throughout the pyrolysis process, ensuring that the separation action is continuous rather than intermittent. The fluidizing gas stream continuously carries polymer particles upward while allowing filler to settle, providing ongoing separation throughout the entire processing cycle rather than requiring discrete separation steps.
3Device complexity
If the filler and fluidized material are discharged together, then the process is simplified, but the filler must be separated later
Solution Approach 1:
The patent performs the separation action preliminarily during the fluidization process itself, before discharge occurs. The fluidizing gas stream continuously separates filler from polymer particles throughout the reaction, so that when discharge happens, the materials are already separated into distinct streams. This eliminates the need for post-discharge separation operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables a more efficient and cost-effective recycling process by allowing the discharged solids to be reused, reducing the need for additional separation equipment and improving material and energy efficiency.
Implementation Method 1
depolymerizing the at least one polymer of the feed material by pyrolysis to form a pyrolysis product
Implementation Method 2
feeding the feed material into a fluidized bed reactor with at least one fluidized bed
Data Source
AI summary
A process for reprocessing composite plastic parts, for example molded parts produced from curable casting compounds, such as sanitary basins, comprising at least one filler and at least one polymer, in particular polymethyl methacrylate is provided.