Integrated Chemical Recycling Converts Mixed Plastic Waste to Feedstocks
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Solution Overview
Problem
Conventional recycling technologies are unable to economically process low-value waste streams and produce additional waste streams that are not recyclable, leading to environmental impact and inefficiency.
Innovation Solution
A chemical recycling method involving solvolysis, partial oxidation gasification, pyrolysis, solidification, cracker, and energy generation facilities to process mixed plastic waste into valuable end products, minimizing waste production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional recycling technologies are used to process waste materials, then recycling capability is provided, but low-value waste streams cannot be processed economically and additional waste streams are produced that are not recyclable
Solution Approach 1:
The patent applies parameter changes by transforming waste plastic through controlled chemical reactions (solvolysis, pyrolysis, gasification) that change the chemical parameters and molecular structure of the material. This converts non-recyclable mixed plastic waste into valuable chemical feedstocks and fuels, resolving the contradiction by enabling economic processing of low-value streams while eliminating unrecyclable waste outputs
Solution Approach 2:
The patent utilizes phase transitions in multiple facilities: solvolysis converts solid plastic to liquid monomers, pyrolysis transforms solid plastic to gas and liquid products, and gasification converts material to gaseous syngas. These phase transitions enable the conversion of stubborn low-value waste into economically valuable products, addressing both the productivity and waste loss concerns
2Duration of action of stationary object
If conventional recycling processes are used, then recycling operation is maintained, but waste streams are produced that must be disposed of, resulting in additional environmental impact
Solution Approach 1:
The patent converts harmful waste streams into beneficial products through chemical transformation. Facilities like the pyrolysis facility and gasification facility transform what would be harmful unrecyclable waste into valuable chemical feedstocks, fuels, and energy. This principle directly addresses the contradiction by eliminating environmental harm while maintaining continuous operation
Solution Approach 2:
The integrated facility serves itself by using waste plastic as feedstock for multiple processes that generate both products and energy. The system's own waste streams become input materials for other units, creating a self-sufficient operation that eliminates external waste disposal needs and reduces environmental impact
3Loss of substance
If chemical recycling methods are implemented, then valuable end products are produced and waste streams are minimized, but facility complexity and processing requirements increase
Solution Approach 1:
The patent merges multiple recycling functions into an integrated facility where solvolysis, pyrolysis, gasification, and solidification facilities work together. This consolidation achieves waste stream minimization through comprehensive processing while managing complexity through integrated design and shared infrastructure, resolving the contradiction between effectiveness and complexity
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 effectively recycles a variety of plastics, producing commercially valuable outputs while reducing further waste streams and environmental impact.
Implementation Method 1
subjecting at least a portion of the PET-enriched stream to solvolysis in a solvolysis facility to form a principal glycol product, a principal terephthalyl product
Implementation Method 2
introducing at least a portion of the coproduct stream from the solvolysis facility into at least one of the following: (i) a partial oxidation (POX) gasification facility
Implementation Method 3
introducing at least a portion of the coproduct stream from the solvolysis facility into at least one of the following: (ii) a pyrolysis facility
Data Source
AI summary
Chemical recycling facilities for processing mixed plastic waste are provided herein. Such facilities have the capability of processing mixed plastic waste streams and utilize a variety of recycling facilities, such as, for example, solvolysis facility, a pyrolysis facility, a cracker facility, a partial oxidation gasification facility, an energy generation/energy production facility, and a solidification facility. Streams from one or more of these individual facilities may be used as feed to one or more of the other facilities, thereby maximizing recovery of valuable chemical components and minimizing unusable waste streams.