Plastic Waste Conversion to Base Chemicals via Aromatic Solvent Dissolution
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Solution Overview
Problem
Current plastic waste recovery processes are energy inefficient, limited in applicability, produce poor-quality products, and generate environmental pollutants, failing to effectively break down plastic waste into high-purity base molecules for sustainable reuse.
Innovation Solution
A process involving the reduction of plastic waste into particulate form, dissolution in an aromatic solvent, fractionation, catalytic decomposition, and delayed coking to produce high-purity base chemicals, enhancing product quality and reducing contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pyrolysis is used to convert plastic waste into products, then plastic waste can be converted into useful products like pyrolysis oil and syngas, but the product quality varies and the process is energy inefficient
Solution Approach 1:
The patent changes the fundamental parameter of the conversion process from thermal decomposition (pyrolysis) to chemical dissolution. By using aromatic solvents to dissolve plastic waste and then precipitating polymers selectively, the process achieves higher conversion efficiency with lower energy consumption compared to high-temperature pyrolysis methods
Solution Approach 2:
The patent replaces the thermal-mechanical pyrolysis system with a chemical dissolution-precipitation system. Instead of using heat and mechanical grinding to break down plastics, the invention uses chemical solvents to dissolve polymers and controlled precipitation to recover them, significantly reducing energy input requirements
2Quantity of substance
If pyrolysis is used to convert plastic waste, then products can be obtained, but the quality of products varies depending on plastic type and process conditions
Solution Approach 1:
The patent changes the separation mechanism from thermal decomposition products to solvent-based selective dissolution. By adjusting solvent type, temperature, and precipitation conditions, the process achieves consistent high-quality polymer recovery with controlled molecular weight distribution, eliminating the quality variability inherent in pyrolysis
Solution Approach 2:
The patent introduces aromatic solvents as intermediaries that selectively dissolve specific polymer types. This intermediary step allows for precise control over which polymers are recovered and in what quality, enabling consistent product specifications regardless of the mixed plastic waste input composition
3Adaptability or versatility
If known plastic waste recovery processes are used, then some plastic can be processed, but they are limited in applicability to different types of plastic wastes
Solution Approach 1:
The patent creates a universal processing system where a single dissolution-precipitation platform can handle multiple plastic types by simply changing the solvent system. The process can process mixed plastic waste streams containing polyolefins, polyesters, and other polymers simultaneously, achieving both high versatility and maintained productivity
Solution Approach 2:
The patent segments the plastic waste processing into distinct dissolution and precipitation stages, where different solvent systems can be applied to different plastic fractions. This segmentation allows the process to adapt to various plastic types while maintaining overall high processing capacity through parallel treatment streams
4Quantity of substance
If plastic waste is processed using current methods, then recovery is achieved, but environmental pollutants are produced
Solution Approach 1:
The patent converts the harmful aspect of plastic persistence into a benefit by using the same chemical stability that makes plastics polluting to enable selective dissolution and recovery. The stable polymer chains that resist degradation are the same chains that can be selectively dissolved and recovered with high purity, turning the pollution problem into a recovery opportunity
Solution Approach 2:
The patent uses aromatic solvents as intermediaries that temporarily complex with polymer chains, allowing separation from contaminants. The solvent acts as a protective mediator during processing, preventing direct contact between plastic waste and equipment that could generate pollutants, and enabling recovery of ultra-pure polymers free from environmental contaminants
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 process achieves efficient conversion of plastic waste into high-purity base chemicals, reducing the need for virgin plastic production and minimizing environmental impact by producing valuable products like ethylene, propylene, and aromatics with high yield and purity.
Implementation Method 1
dissolving the particulate plastic waste in an aromatic solvent to produce a dissolved plastic solution effluent
Implementation Method 2
catalytically decomposing the components of the bottom fraction to produce decomposition products
Implementation Method 3
subjecting at least a portion of the decomposition products to a coking operation
Implementation Method 4
fractionating the dissolved plastic solution effluent to produce an overheads fraction and a bottoms fraction
Data Source
AI summary
This invention provides an advanced process for converting plastic waste into base chemicals. In various embodiments, the process includes one or more of the following process steps, including cleaning, shredding, dissolving plastic waste in an aromatic solvent, pre-fractionation, catalytic decomposition, fractionation, and coking. This method effectively breaks down plastic waste into valuable chemicals and high-quality reusable plastic.