Plastic Pyrolysis Reactors for Mixed-Stream Hydrocarbon Production
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Solution Overview
Problem
There are few effective options for recycling mixed polyolefin streams of post-consumer and post-industrial plastics into value-added chemical and refinery feedstock products at an industrially significant scale.
Innovation Solution
A reactor system is used to pyrolyze plastic feedstock comprising post-consumer and/or post-industrial plastics, heating them to temperatures between 200° C. and 1,000° C. for a cumulative period of 324 hours or more, producing hydrocarbon-based compositions such as waxes and oils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If plastic feedstock is pyrolyzed at high temperature for extended periods to produce high-quality hydrocarbon products, then product quality and purity are improved, but energy consumption and operational time increase
Solution Approach 1:
The system dynamically adjusts pyrolysis temperature and residence time based on feedstock composition and desired product specifications. The reactor operates in different temperature zones (200-1000°C) with varying停留 times to optimize product distribution while managing energy input, allowing flexible adaptation to different plastic types and contamination levels
Solution Approach 2:
The process employs controlled changes in temperature, pressure, and residence time parameters to optimize pyrolysis efficiency. By adjusting these parameters based on real-time monitoring of product formation and feedstock characteristics, the system achieves high product quality without excessive energy consumption
2Quantity of substance
If mixed polyolefin streams are processed to produce value-added chemical products, then recycling value is improved, but process complexity increases
Solution Approach 1:
The pyrolysis process is divided into distinct stages with different temperature profiles and residence times to selectively produce different hydrocarbon product ranges. This segmentation allows the system to handle mixed polyolefin streams by processing different components optimally, converting diverse plastic waste into valuable chemical feedstocks without requiring complex pre-sorting infrastructure
Solution Approach 2:
The reactor system is designed to universally process various types of mixed polyolefin feedstocks (polyethylene, polypropylene, polystyrene, and their blends) through a single integrated pyrolysis process, producing a range of valuable hydrocarbon products that can be used as chemical feedstocks or fuel components
3Productivity
If pyrolysis is conducted at industrially significant scale, then productivity is improved, but system complexity and operational challenges increase
Solution Approach 1:
The system incorporates preliminary feedstock preparation and pre-heating stages before the main pyrolysis reaction zone. Moisture removal, size reduction, and pre-drying operations are performed upstream to ensure consistent feedstock quality, enabling stable large-scale operation and reducing complications during the main pyrolysis process
Solution Approach 2:
The pyrolysis system is designed for continuous operation with steady feedstock input and product output, maintaining optimal temperature and residence time conditions throughout the reactor. This continuous operation mode maximizes productivity while simplifying operational control compared to batch processing at industrial scale
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 system effectively converts plastics into high-quality hydrocarbon-based products, reducing contaminants and achieving industrial-scale recycling efficiency.
Implementation Method 1
one or more heaters configured for heating the feedstock in the reactor vessel's internal volume to a temperature between 200° C. and 1,000° C.
Implementation Method 2
a reactor vessel defining an internal volume configured for receiving and pyrolyzing the plastic feedstock
Data Source
AI summary
Disclosed herein are reactors for pyrolysis of plastic feedstock comprising post-consumer and/or post-industrial plastics. In various implementations, the reactors include a reactor vessel, and one or more heaters configured for heating the feedstock in the reactor vessel's internal volume.