Pyrolysis-Derived Hydrocarbon Compositions Without Post-Refining
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Solution Overview
Problem
There are limited options for recycling mixed polyolefin streams of polyethylene, polypropylene, and polystyrene waste plastics into value-added chemical and refinery feedstock products at an industrially significant scale.
Innovation Solution
Hydrocarbon compositions derived from the pyrolysis of post-consumer and/or post-industrial plastics, specifically waxes and oils, with defined molecular weights, hydrocarbon compositions, and impurity levels, produced at an industrial scale without additional refining steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pyrolysis is performed on mixed polyolefin streams to produce waxes and oils, then high yields of valuable hydrocarbon products are achieved, but extensive post-pyrolysis refining is typically required to meet quality specifications
Solution Approach 1:
The patent applies parameter changes by optimizing pyrolysis conditions (temperature, residence time, heating rate) to directly produce waxes and oils that meet quality specifications without requiring extensive post-pyrolysis refining. The process parameters are tuned to control molecular weight distribution and hydrocarbon composition, enabling the production of market-ready products in a single step.
Solution Approach 2:
The patent extracts and removes specific unwanted components (such as catalyst residues, heavy contaminants, and unwanted molecular weight fractions) during the pyrolysis process itself through optimized reaction conditions and in-process separation, rather than requiring multiple subsequent refining steps. This extraction approach simplifies the overall process by eliminating the need for complex post-processing.
2Ease of manufacture
If traditional recycling methods are used for mixed polyolefin plastics, then processing is simplified, but the ability to produce value-added chemical and refinery feedstock products at industrially significant scale is limited
Solution Approach 1:
The patent applies universality by designing a pyrolysis process that simultaneously handles mixed polyolefin streams (polyethylene, polypropylene, polystyrene) and produces multiple valuable products (waxes, oils, and refinery feedstocks) in a single operation. This multi-functional approach enables industrial-scale production of various high-value chemicals from diverse plastic waste feeds without requiring separate processing lines for each plastic type.
Solution Approach 2:
The patent utilizes parameter changes to optimize the pyrolysis process for industrial scalability by adjusting temperature profiles, residence times, and reactor design parameters to achieve high conversion rates and product yields at large scales while maintaining product quality. The process parameters are specifically tuned to handle mixed polyolefin compositions efficiently at industrially significant throughput.
3Adaptability or versatility
If pyrolysis produces waxes and oils with broad molecular weight distributions, then a wider range of hydrocarbon products are obtained, but additional refining steps are needed to meet specific application requirements
Solution Approach 1:
The patent applies parameter changes by precisely controlling pyrolysis conditions (temperature, heating rate, residence time) to produce waxes and oils with targeted molecular weight distributions that directly meet the specifications of intended applications. By adjusting these parameters, the process can be tuned to produce products suitable for lubricants, fuels, or chemical feedstocks without requiring additional fractionation or refining steps, thus maintaining versatility while eliminating complex post-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 compositions provide high yields of waxes and oils suitable for various industrial applications, meeting stringent quality specifications and bypassing the need for extensive post-pyrolysis refining.
Implementation Method 1
hydrocarbon based compositions derived from pyrolysis of a feedstock comprising post-consumer and/or post-industrial plastics
Data Source
AI summary
Disclosed herein are hydrocarbon based compositions derived from pyrolysis of a feedstock comprising post-consumer and/or post-industrial plastics and methods of making and use thereof.