Carbon Black Production from Plastic Pyrolytic Char
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Solution Overview
Problem
Current methods for disposing of plastic waste, such as incineration and recycling, are inefficient and produce harmful by-products, while traditional carbon black production is resource-intensive and generates greenhouse gases, highlighting the need for a sustainable process to convert plastic pyrolytic char into high-quality carbon black.
Innovation Solution
A process involving pre-washing followed by acid and base washing of plastic pyrolytic char derived from polyethylene or polypropylene, which effectively increases carbon content and reduces ash and metal impurities, producing carbon black suitable for use without further processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If plastic waste is incinerated to generate energy, then heat energy is produced for electricity generation, but carcinogenic furans and dioxins are emitted and energy is lost during transport
Solution Approach 1:
The patent converts plastic waste, which would otherwise be harmful pollution, into beneficial carbon black product through pyrolysis. The process transforms the harmful waste material into a valuable commodity while avoiding the emission of carcinogenic substances associated with incineration.
Solution Approach 2:
The patent changes the processing parameters from high-temperature combustion (incineration) to controlled thermal decomposition at lower temperatures (pyrolysis at 500-800°C). This parameter change fundamentally alters the chemical reactions, producing carbon black instead of toxic emissions while still recovering energy.
2Loss of substance
If plastic waste is recycled to produce new plastics, then plastic material is recovered for new products, but time and labour-intensive collection and separation are required causing low technical and economic feasibility
Solution Approach 1:
The patent extracts carbon black from plastic waste through pyrolysis, bypassing the need for collection and separation processes. The pyrolysis process directly converts plastic waste into carbon black and other products, eliminating the time-consuming sorting and cleaning steps required for traditional plastic recycling.
Solution Approach 2:
The patent changes the recycling approach from mechanical recycling (requiring sorting and cleaning) to chemical recycling through pyrolysis. This fundamental parameter change in the recycling method eliminates the need for time-intensive separation processes while still achieving material recovery.
3Object-generated harmful factors
If plastic pyrolysis is used to recover energy and produce products, then fewer toxic gases are emitted and energy recovery efficiency is higher, but the process requires optimization of operating conditions to maximize desired product yield
Solution Approach 1:
The patent systematically varies key process parameters including temperature (500-800°C), heating rate, and residence time to optimize carbon black yield. By establishing specific parameter ranges and their interrelationships, the patent reduces the complexity of process optimization while maximizing desired product output.
4Quantity of substance
If traditional carbon black production is used, then carbon black is produced for industrial applications, but the process is resource-intensive and generates greenhouse gases
Solution Approach 1:
The patent recovers carbon black from plastic waste that would otherwise be discarded as pollution. Instead of producing carbon black from virgin fossil fuel resources through resource-intensive processes, the patent discards the harmful plastic waste and recovers valuable carbon black material simultaneously.
Solution Approach 2:
The patent converts harmful plastic waste and greenhouse gas emissions into beneficial carbon black product. The process transforms environmental pollutants into a valuable industrial material, eliminating the need for resource-intensive traditional carbon black production while reducing greenhouse gas emissions.
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 process efficiently produces high-quality carbon black with increased carbon content and reduced impurities, offering a sustainable alternative to traditional carbon black production, reducing waste accumulation and greenhouse gas emissions.
Implementation Method 1
Pyrolysis is the thermal decomposition of materials at elevated temperatures in the absence of oxygen. Thus, no combustion or oxidation takes place. In plastic pyrolysis, the plastic wastes are heated to a temperature such as 500 to 800° C. to degrade the wastes into combustible gases, liquid and solid products.
Implementation Method 2
washing the pre-washed plastic pyrolytic char with acid
Implementation Method 3
washing the acid-washed plastic pyrolytic char with base
Data Source
AI summary
The present invention relates to a process for the production of carbon black from a plastic pyrolytic char. In particular, the process comprises pre-washing the plastic pyrolytic char followed by washing with acid and then base.