Multi-Stage Acid Treatment for Polyester Nylon Waste Fabric Recycling
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Solution Overview
Problem
Current methods for disposing of waste fabric containing polyester and nylon are inefficient, particularly in reducing the overall usage of acid liquids and maximizing the recycling of polyester and nylon.
Innovation Solution
A multi-stage treatment process is employed, involving acid treatments at different stages to separate and recycle polyester and nylon from waste fabric, while minimizing the use of acid liquids. The process includes four stages: initial acid treatment, dilution, further acid treatment, and final dilution, resulting in the recovery of recyclable materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional single-stage acid treatment is used to separate polyester and nylon from waste fabric, then the separation process is simple, but the overall usage amount of acid liquid is high and the recycling amount of polyester and nylon is reduced
Solution Approach 1:
The patent divides the acid treatment process into multiple stages (first-stage treatment, second-stage treatment, third-stage treatment, and fourth-stage treatment), each with different acid concentrations and treatment conditions. This segmentation allows for optimized separation at each stage, improving the overall recycling amount of polyester and nylon while reducing total acid liquid usage compared to a single-stage process.
2Productivity
If high acid concentration is used to improve separation efficiency, then the separation speed increases, but the overall usage amount of acid liquid increases and environmental harm increases
Solution Approach 1:
The patent changes the acid concentration parameter across different treatment stages. The first-stage treatment uses a higher acid concentration for initial separation, while subsequent stages use progressively lower concentrations. This parameter change strategy maintains high separation efficiency in early stages while reducing acid liquid usage and environmental harm in later stages.
Solution Approach 2:
Different acid concentrations are applied to different treatment stages based on the specific separation needs at each stage. The first-stage treatment uses higher acid concentration where rapid separation is needed, while later stages use lower concentrations for finishing the separation process, optimizing both efficiency and environmental impact locally at each stage.
3Loss of substance
If multiple acid treatments are performed to maximize recycling, then the recycle amount of polyester and nylon increases, but the overall usage amount of acid liquid increases
Solution Approach 1:
The patent implements periodic acid treatments with alternating high and low concentration stages. The first-stage and third-stage treatments use higher acid concentrations for effective separation, while the second-stage and fourth-stage treatments use lower concentrations. This periodic action pattern maximizes recycling efficiency while controlling the overall acid liquid usage through strategic concentration variation.
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 effectively reduces the overall usage of acid liquids and increases the recycling amount of polyester and nylon, making the process more environmentally friendly and economically viable.
Implementation Method 1
performing a first-stage treatment on the waste fabric to obtain a first liquid material and a first solid material... The first-stage treatment includes acid treatment
Data Source
AI summary
A disposal method for waste fabric containing polyester and nylon includes: step (a): providing a waste fabric containing polyester and nylon; step (b): performing a first-stage treatment including acid treatment on the material to obtain a first liquid material and a first solid material; step (c): performing a second-stage treatment on the first liquid material to obtain a second liquid material and a second solid material; step (d): performing a third-stage treatment including acid treatment on the first solid material to obtain a third liquid material and a third solid material; step (e): performing a fourth-stage treatment on the third liquid material to obtain a fourth liquid material and a fourth solid material, wherein the acid concentration of the second liquid material is lower than the acid concentration of the first liquid material, and the acid concentration of the fourth liquid material is lower than the acid concentration of the third liquid material.