Ionic Liquid Dye Stripping for Textile Waste Recycling
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Solution Overview
Problem
The textile industry faces challenges in reducing waste and conserving resources due to the high demand for virgin synthetic dyes, with limited attention given to dye recycling technologies, which could reclaim and reuse dyes from waste textiles, offering both environmental and economic benefits.
Innovation Solution
A method involving the use of ionic liquids to strip dyes from dyed textiles, allowing the dyes to be recycled and reused in dyeing processes, utilizing a solution of protic ionic liquids to effectively remove dyes from textiles without degrading them, and then reapplying these dyes to new textiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional dyeing methods are used with virgin synthetic dyes, then textile products achieve desired colouration, but the industry generates large amounts of waste and depletes resources
Solution Approach 1:
The patent applies the discarding and recovering principle by collecting waste textiles and deadstock fabric that would otherwise be discarded, then recovering valuable dyes from these materials through chemical extraction processes. The recovered dyes are purified and reused in new dyeing cycles, transforming waste streams into valuable resources and reducing both waste volume and virgin dye consumption.
Solution Approach 2:
The patent employs parameter changes by modifying the chemical environment through pH adjustment and temperature control during the dye extraction and recycling process. By changing these parameters, the patent enables efficient separation of dyes from textile substrates and facilitates the regeneration of dye solutions for repeated use, thereby resolving the contradiction between waste reduction and manufacturing ease.
2Quantity of substance
If dye recycling technologies are implemented, then virgin synthetic dye demand is reduced, but the recycling process complexity increases
Solution Approach 1:
The patent applies the extraction principle by selectively removing dyes from waste textile matrices using chemical solvents and extraction agents. This targeted extraction isolates the valuable dye components from complex textile waste streams, enabling their recovery and reuse while simplifying the overall recycling process architecture and reducing the need for elaborate separation systems.
Solution Approach 2:
The patent implements universality by developing a multi-functional recycling system that can handle various types of textile waste (deadstock, fabric scraps, unsold garments) and extract different classes of dyes using a standardized process framework. This universal approach reduces process complexity by avoiding the need for separate specialized recycling lines for each waste type.
3Productivity
If dyes are stripped from textiles for recycling, then dye reuse is enabled, but the stripping process requires additional chemical resources
Solution Approach 1:
The patent applies the self-service principle by designing a closed-loop system where the chemical agents used for dye extraction are regenerated and reused within the same process cycle. The stripping chemicals are recovered from the extracted dye solutions and replenished only when necessary, enabling the system to sustain high dye recycling efficiency while minimizing continuous chemical resource consumption.
Solution Approach 2:
The patent recovers both the valuable dyes and the chemical stripping agents from the extraction process. By recovering and reusing these chemicals rather than discarding them, the system achieves high dye recycling efficiency while significantly reducing the net consumption of chemical resources, thus resolving the contradiction between productivity and resource loss.
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
This method enables the efficient recycling of dyes, reducing the need for virgin dyes, conserving resources, and providing a sustainable solution by effectively stripping and reusing dyes in textile production, while maintaining dye quality and efficiency.
Implementation Method 1
adding the textile to a bath comprising a solution of ionic liquid, thereby causing the dye to strip from the textile and to disperse within said solution
Data Source
AI summary
A method for recycling dye from a dyed textile, the method comprising providing a textile coloured with a dye; adding the textile to a bath comprising a solution of ionic liquid, thereby causing the dye to strip from the textile and to disperse within said solution.