Plastic Pyrolysis Reactor Control for Mixed Polyolefin Recycling
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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 and energy application to produce hydrocarbon-based compositions.
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 an industrially significant scale is insufficient
Solution Approach 1:
The patent applies parameter changes by controlling pyrolysis temperature (400-800°C), residence time (1-60 minutes), and heating rate (10-100°C/min) to transform mixed polyolefin waste into valuable hydrocarbon products. These parameter optimizations enable industrial-scale recycling while managing process complexity through systematic control variables
Solution Approach 2:
The patent utilizes phase transitions during pyrolysis, where solid plastic feedstock is heated to undergo thermal decomposition and transform into liquid hydrocarbon products and gaseous byproducts. This phase transition mechanism enables the conversion of mixed polyolefin streams into separable product phases that can be refined into valuable chemicals and feedstocks
2Productivity
If pyrolysis temperature is increased to improve conversion efficiency, then productivity increases, but energy consumption increases
Solution Approach 1:
The patent employs periodic action through controlled heating cycles and residence time management in the pyrolysis process. By optimizing the duration and intensity of heating phases, the process achieves high conversion efficiency while minimizing total energy input through time-temperature profile optimization
Solution Approach 2:
The patent implements feedback control through monitoring pyrolysis product composition and adjusting operating parameters accordingly. This allows optimization of energy consumption by adapting heating intensity and residence time to achieve target product yields without excessive energy input
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 products, addressing the challenge of recycling mixed plastic streams efficiently and at scale.
Implementation Method 1
pyrolyzing the plastic feedstock in the internal volume of the reactor vessel
Implementation Method 2
pyrolyzing the plastic feedstock... to produce hydrocarbon-based compositions
Implementation Method 3
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 4
using one or more heaters to heat the plastic feedstock... to a temperature of 200° C. or more
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.