Cigarette Butt Recycling Through Multi-Stage Component Separation
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Solution Overview
Problem
Existing methods for recycling cigarette butts primarily focus on cellulose acetate recovery, neglecting the other components and failing to minimize environmental impact, despite these components making up a significant portion of the waste.
Innovation Solution
A method involving drying, mechanical agitation, magnetic separation, shredding, air separation, and multiple ethanol washes to separate cellulose acetate, paper, tobacco, and ash, with pollutant removal, allowing all components to be recycled and pollutants to be eliminated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If existing methods focus primarily on cellulose acetate recovery through washing and melting, then polymer fiber recycling is improved, but other components (tobacco, ash, paper) making up 70% of waste are neglected and environmental impact is not minimized
Solution Approach 1:
The patent applies segmentation by dividing the cigarette butt into multiple components (cellulose acetate filter, tobacco, paper, ash) and processing each through dedicated separation stages. Mechanical agitation, air classification, and screening separate these components individually, allowing each to be recovered or disposed of appropriately, thus addressing both recovery efficiency and environmental concerns
Solution Approach 2:
The patent uses parameter changes by adjusting physical conditions (air flow rates, screening mesh sizes, agitation intensity) to optimize separation efficiency for different components. These parameter adjustments enable effective separation of tobacco, paper, and cellulose acetate while minimizing energy consumption and environmental impact
2Adaptability or versatility
If mechanical agitation and multiple separation stages are used to separate all components, then comprehensive recycling is achieved, but process complexity increases
Solution Approach 1:
The complex separation process is segmented into distinct operational stages: mechanical agitation for initial breakdown, air classification for tobacco removal, screening for paper separation, and washing for cellulose acetate recovery. Each stage handles a specific separation task, making the overall complex process more manageable and efficient
Solution Approach 2:
The patent employs multi-functional equipment that performs multiple separation tasks. For example, the air classification system simultaneously removes tobacco and light paper fragments, while the screening process handles both size classification and material separation, reducing the number of dedicated devices needed
3Loss of substance
If cellulose acetate is processed through washing and melting into thermoplastic mass, then polymer recycling is improved, but energy consumption and environmental impact increase
Solution Approach 1:
The patent extracts cellulose acetate from the cigarette butt through selective washing processes that dissolve and separate the polymer from other components. The washed cellulose acetate is then dried and can be processed into reusable forms, reducing the energy required compared to traditional melting methods while maintaining recovery efficiency
Solution Approach 2:
The patent employs disposable or easily replaceable washing solvents and processing aids that can be regenerated or replaced at low cost and energy expenditure, avoiding the need for high-energy melting and reprocessing of the cellulose acetate
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
Enables comprehensive recycling of cigarette butt components with minimal environmental impact by effectively separating and recycling cellulose acetate, paper, tobacco, and ash, while removing pollutants.
Implementation Method 1
a phase for separating cigarette butts containing metallic material is provided, carried out by means of a magnetized conveyor line
Implementation Method 2
The paper fraction is separated by blowing air onto the shredded semi-finished product and separating the paper fragments and acetate fiber with at least one screen
Implementation Method 3
The washing of the fiber obtained after separation from the paper fraction is repeated a given number of times, and the washing liquid is distilled in order to separate the pollutants present in the fiber
Implementation Method 4
the washing liquid is distilled in order to separate the pollutants present in the fiber and reused for subsequent washings
Data Source
Figure 1
AI summary
Method for recycling and disposing of cigarette butts and similar items, comprising the following steps: - drying the butts (2); - breaking up the butts (5); - separating (3) the tobacco (15) and ash (25) contained in the butts; - shredding (6) the butts with the tobacco and ash removed; - separation (7, 7') of the shredded paper fraction (27) and any PLA (37) present from the shredded cellulose acetate fiber; - washing (8) of the acetate fiber; - drying (10) of the washed acetate fiber.