Cyclic Carbamate Solvent System for Polyester Extraction
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Solution Overview
Problem
Current recycling methods for synthetic polyesters are energy-intensive and require harsh chemical conditions, making them inefficient and environmentally damaging, especially for thermosetting polyesters.
Innovation Solution
A solvent system comprising specific compounds (general Formula I, IV, V, or VI) is used to dissolve polyesters at lower energy costs and with reduced environmental impact, allowing for the extraction of polyesters from waste products like fabrics and plastic bottles, with optional combination with other solvents and temperatures between 50°C to 150°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current recycling methods are used to break down polyester, then polyester can be reduced to component monomers, but the process requires high temperatures and harsh chemical agents which are energy intensive and environmentally damaging
Solution Approach 1:
The patent changes the chemical parameters by introducing a novel solvent system comprising a cyclic carbamate ester compound, which enables polyester dissolution and recycling at lower temperatures without requiring harsh chemical conditions, thus reducing energy consumption while maintaining recycling effectiveness
Solution Approach 2:
The patent uses a cyclic carbamate ester compound as an intermediary solvent that mediates between the polyester polymer and the recycling process, enabling breakdown and reuse without direct application of high energy or harsh chemicals
2Reliability
If mechanical breakdown is used to recycle polyester, then the chemical structure is retained and polyester can be reform into useful products, but the process still requires high temperatures and is energy intensive
Solution Approach 1:
The patent replaces mechanical breakdown processes with a chemical dissolution approach using the cyclic carbamate ester solvent system, which dissolves polyester at lower temperatures and allows for easier reforming without the energy-intensive mechanical processing steps
3Adaptability or versatility
If thermosoftening polyester is remoulded with heating, then the polyester can be reused, but this method does not work for thermosetting polyesters and still requires high temperatures
Solution Approach 1:
The patent changes the temperature parameter by using a solvent-based dissolution process that works at lower temperatures, and changes the chemical environment parameter by introducing the cyclic carbamate ester solvent, enabling both thermosoftening and thermosetting polyesters to be dissolved and remoulded without high temperature heating
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 solvent system effectively dissolves polyesters with low toxicity, enabling easy separation of impurities and recycling of polyesters into reusable forms, such as pellets or fibers, while minimizing energy consumption and environmental harm.
Implementation Method 1
A solvent system comprising specific compounds (general Formula I, IV, V, or VI) is used to dissolve polyesters at lower energy costs
Data Source
AI summary
A process for extracting polyester from an article using a solvent system comprising a compound according to any of general Formula I to VI wherein R1 and R2 are each independently selected from: hydrogen, alkyl, alkenyl, alkynyl, aryl or alkoxy groups; R3 to R12 are each independently selected from: hydrogen, alkyl, alkenyl, alkynyl, aryl or alkoxy groups; X is selected from O or S; and each of a to e is a carbon atom, wherein the total linear chain length of a-b-c-d-e is in the range of 2 to 5 carbons; R13 and R15 are both independently aryl groups; R14, R16, R17, R18 and R19 are each independently selected from hydrogen, alkyl, alkenyl, alkynyl or aryl groups; n is an integer in the range of 1 to 8; m is 3; and 1 is an integer in the range of 1 to 3; or combination thereof.