Two-Stage Waste Polymer Pyrolysis for Sulfur-Chlorine Control
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Solution Overview
Problem
Existing industrial methods for waste organic polymer materials fail to address the chaotic decomposition of waste organic polymer materials, leading to poor quality pyrolysis oil products and catalyst poisoning due to sulfur and chlorine release, which reduces yield and quality.
Innovation Solution
A method involving a composite auxiliary agent to immobilize harmful elements like sulfur and chlorine, separating waste organic polymer materials and catalysts to move in opposite directions, and maintaining catalysts at optimal activity temperature for enhanced pyrolysis product quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If waste organic polymer materials and catalysts are placed together in a pyrolysis reactor, then the quality of pyrolysis oil products is enhanced under catalyst influence, but the decomposition temperature conflict causes severe fragmentation and reduces pyrolysis oil yield
Solution Approach 1:
The invention divides the pyrolysis system into two separate reactors: a first pyrolysis reactor for thermal decomposition of waste organic polymer materials, and a second pyrolysis reactor for catalytic conversion. This segmentation allows each reactor to operate at its optimal temperature independently, resolving the temperature conflict between material decomposition and catalyst activity while maximizing both yield and quality of pyrolysis oil products.
Solution Approach 2:
The invention introduces pyrolysis gas as an intermediary carrier between the first and second reactors. The pyrolysis gas transports intermediate decomposition products from the first reactor to the second reactor, enabling sequential processing without direct contact between waste materials and catalysts, thus avoiding fragmentation while maintaining catalytic enhancement.
2Quantity of substance
If decomposition temperature of waste organic polymer materials is prioritized, then complete decomposition is achieved, but catalyst activity does not reach optimum
Solution Approach 1:
The invention separates the decomposition process into two stages in different reactors: the first reactor operates at high temperature (400-600°C) to ensure complete decomposition of waste organic polymer materials, while the second reactor operates at optimal catalyst activity temperature (200-400°C) for efficient catalytic conversion. This segmentation allows both decomposition completeness and catalyst activity to reach their respective optima simultaneously.
3Productivity
If waste organic polymer materials contain sulfur and chlorine elements, then decomposition occurs, but harmful compounds are released causing catalyst poisoning and equipment corrosion
Solution Approach 1:
The invention extracts and removes harmful sulfur and chlorine compounds during the pyrolysis process through controlled decomposition conditions and catalyst selection. The two-reactor system allows for selective removal of harmful elements while maintaining decomposition efficiency, preventing catalyst poisoning and equipment corrosion.
Solution Approach 2:
The invention converts harmful sulfur and chlorine compounds into useful byproducts or removes them through the catalytic process. The catalysts in the second reactor facilitate the transformation of harmful elements into less harmful substances or valuable chemical intermediates, turning the harmful decomposition byproducts into beneficial outcomes.
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
The method significantly reduces sulfur and chlorine content in pyrolysis oil products by over 85%, increasing the yield of valuable chemical raw materials like low-carbon olefins and aromatics, enhancing the economic value of pyrolysis products.
Implementation Method 1
adding a composite auxiliary agent for removing harmful elements during the pyrolysis process, sulfur, chlorine, and other harmful elements are immobilized within the composite auxiliary agent
Implementation Method 2
Pyrolysis is an effective way to recycle waste organic polymer materials. This involves placing waste organic polymer materials into a pyrolysis reactor and applying a certain temperature to facilitate decomposition
Implementation Method 3
the gaseous pyrolysis products then react with catalysts maintained at the optimal activity temperature, further regulating the quality of the gaseous pyrolysis products
Data Source
AI summary
A method and a device for regulating waste organic polymer material pyrolysis products are provided. Waste organic polymer materials are uniformly mixed with a composite auxiliary agent for removing harmful elements at a mass ratio of 90:10 and subjected to pyrolysis at 400-450° C. Resulting primary pyrolysis products are brought into contact with catalysts and placed at a temperature of 550-800° C. to obtain pyrolysis products. The invention reduces the sulfur and chlorine content in pyrolysis oil products by more than 85%. Through the reverse flow of the waste organic polymer materials relative to the catalysts during pyrolysis, and the regulation of catalyst temperature, the invention achieves increased production of low-carbon olefins and aromatics in the pyrolysis products, significantly improving the economic value of the pyrolysis products and promoting technological innovation in the pyrolysis industry for materials such as waste rubber and waste plastic.