Mixed Polyolefin Pyrolysis for Industrial-Scale Feedstock 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 method for pyrolyzing plastic feedstock comprising post-consumer and/or post-industrial plastics using a reactor vessel with controlled heating to produce hydrocarbon-based compositions, applying energy at a specific density for efficient conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
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 at industrially significant scale is insufficient
Solution Approach 1:
The patent applies parameter changes by controlling pyrolysis temperature (400-800°C), residence time, and heating rate to transform mixed polyolefin waste into valuable hydrocarbon products. This resolves the contradiction by enabling industrial-scale production through optimized process parameters while managing complexity through systematic control
Solution Approach 2:
The patent utilizes phase transitions during pyrolysis, where solid plastic waste undergoes thermal decomposition into liquid oils and gaseous products. This phase transition mechanism enables scalable conversion of mixed polyolefins into valuable feedstocks while the controlled transition process manages the complexity of handling diverse plastic compositions
2Productivity
If pyrolysis temperature is increased to improve conversion efficiency, then production rate increases, but energy consumption increases
Solution Approach 1:
The patent implements periodic action through controlled heating cycles and residence time management in the pyrolysis process. By cycling through heating phases and maintaining optimal residence times, the system achieves high conversion efficiency while managing energy input through rhythmic, controlled energy application rather than continuous maximum heating
Solution Approach 2:
The patent ensures continuity of useful action through continuous pyrolysis operation with steady-state temperature maintenance and continuous product removal. This continuous operation optimizes energy utilization by avoiding repeated heating cycles, maintaining high conversion efficiency while reducing overall energy consumption through sustained, controlled thermal processing
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 production of hydrocarbon-based compositions from plastic waste, providing a viable route for recycling and producing valuable chemical and refinery feedstocks.
Implementation Method 1
using one or more heaters to heat the plastic feedstock in the reactor vessel's internal volume to a temperature of 200° C. or more
Implementation Method 2
pyrolyzing the plastic feedstock in the internal volume of the reactor vessel
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.