Mixed Plastic Pyrolysis for Value-Added Hydrocarbon Feedstocks
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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 method for pyrolyzing plastic feedstock comprising post-consumer and/or post-industrial plastics, involving heating the feedstock in a reactor vessel to temperatures between 200° C. and 1,000° C. for a cumulative period of 324 hours or more, to produce hydrocarbon-based compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional recycling methods are used for mixed polyolefin streams, then processing simplicity is maintained, but the ability to produce value-added chemical and refinery feedstock products is insufficient
Solution Approach 1:
The patent applies parameter changes by implementing specific pyrolysis conditions including temperature ranges (400-800°C), residence times (0.5-5 seconds), and heating rates (10-100°C/s) to transform mixed polyolefin waste into valuable hydrocarbon products. These controlled parameter changes enable the conversion of low-value plastic waste into high-value chemical feedstocks while maintaining process feasibility
Solution Approach 2:
The patent employs periodic action through staged pyrolysis processes with multiple heating zones and controlled residence time periods. The process uses sequential temperature zones and staged product collection to maximize value-added product yield from mixed polyolefin streams while managing the complexity of processing diverse plastic compositions
2Manufacturing precision
If pyrolysis temperature is increased to improve product quality, then hydrocarbon composition quality improves, but energy consumption increases
Solution Approach 1:
The patent applies dynamics by implementing variable temperature profiles with different heating rates (10-100°C/s) and residence times (0.5-5 seconds) in different reactor zones. This dynamic temperature control optimizes hydrocarbon product quality while minimizing energy consumption by applying higher temperatures only where and when needed for specific product specifications
Solution Approach 2:
The patent uses preliminary action through pre-heating zones and staged heating approaches before reaching final pyrolysis temperatures. This preliminary thermal treatment prepares the polyolefin feedstock for efficient pyrolysis, reducing the total energy required to achieve target hydrocarbon composition qualities
3Productivity
If residence time is extended to improve conversion completeness, then product yield increases, but processing time and productivity decrease
Solution Approach 1:
The patent implements continuity of useful action through continuous pyrolysis processing with constant feedstock introduction and product removal. This continuous operation maintains optimal conversion conditions throughout the process, achieving high product yields without extending processing time, as the reaction proceeds continuously at optimal parameters rather than in batch cycles
Solution Approach 2:
The patent applies universality by designing a multi-functional reactor system that simultaneously achieves complete conversion, high product yield, and rapid processing. The reactor integrates heating, pyrolysis, product separation, and feedstock introduction in a single continuous operation, eliminating the need for extended residence times while maximizing productivity
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 enables the conversion of plastic waste into valuable hydrocarbon-based products, addressing the challenge of recycling mixed plastic streams and enhancing industrial scalability.
Implementation Method 1
pyrolyzing the plastic feedstock in the internal volume of the reactor vessel... the step of pyrolyzing the plastic feedstock may comprise using one or more heaters to heat the plastic feedstock in the reactor vessel's internal volume to a temperature between 200° C. and 1,000° C.
Data Source
AI summary
Disclosed herein are methods for pyrolysis of plastic feedstock comprising post-consumer and/or post-industrial plastics. In various implementations, the methods include directing the plastic feedstock into an internal volume of a reactor vessel, and pyrolyzing the plastic feedstock in the internal volume of the reactor vessel.