Microwave Pyrolysis Reactors for Scalable Plastic-to-Hydrocarbon Conversion
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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 system for pyrolyzing plastic feedstock using energy transfer apparatuses, including pyrolysis reactors, which heat the feedstock to temperatures between 200° C. and 1,000° C. at an energy rate of 0.80 kW per pound of product per hour or less, producing hydrocarbon-based compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional pyrolysis methods are used to recycle mixed polyolefin streams, then plastic waste can be converted into hydrocarbon products, but the energy consumption is high and industrial scalability is limited
Solution Approach 1:
The patent changes the energy input parameters by using microwave energy at specific power levels (e.g., 1.2 kW, 2.4 kW, 3.6 kW) and controlling temperature ranges (200°C to 1,000°C) to optimize the pyrolysis process. This allows efficient conversion of plastic waste while controlling energy consumption through precise parameter management.
Solution Approach 2:
The patent replaces conventional thermal conduction heating with microwave dielectric heating technology. This substitution enables more efficient energy transfer directly to the plastic feedstock, improving productivity while reducing overall energy consumption through direct volumetric heating rather than surface-to-core heat transfer.
2Productivity
If pyrolysis temperature is increased to improve conversion efficiency, then hydrocarbon product yield increases, but energy consumption increases proportionally
Solution Approach 1:
The patent employs periodic microwave irradiation cycles with specific duty cycles and pulse patterns to heat the plastic feedstock. This periodic action allows controlled temperature increases to optimal pyrolysis ranges while permitting cooling periods, thereby improving conversion efficiency without proportionally increasing total energy consumption.
Solution Approach 2:
The patent utilizes phase transition phenomena during pyrolysis, where plastic feedstock transitions from solid to vapor phase and then condenses into hydrocarbon products. By controlling temperature profiles to match these phase transition points, the process achieves high conversion efficiency at optimized energy input levels rather than continuously high temperatures.
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 plastic waste into valuable hydrocarbon products, addressing the challenge of recycling mixed polyolefin streams and providing a scalable solution for industrial applications.
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
one or more pyrolysis reactors configured for receiving and pyrolyzing the plastic feedstock
Data Source
AI summary
Disclosed herein are systems for pyrolyzing plastic feedstock comprising post-consumer and/or post-industrial plastics. In various implementations, the systems include one or more energy transfer apparatuses configured for receiving the plastic feedstock and applying energy to the plastic feedstock.