High Molecular Weight Wax Transfer Agent for Plastic Waste Pyrolysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional plastic waste recycling processes face challenges in cost-effectiveness, scalability, and efficiency due to restrictions on temperature ranges, catalyst costs, and limitations on the types of plastic waste that can be processed, particularly when using heavy oils as heat recovery agents.
Innovation Solution
The use of high molecular weight waxes as transferring agents in the recycling process, which allows for lower ratios of transferring agent to plastic waste, improved energy efficiency, higher heat capacity, and reduced heat loss, enabling the processing of mixed plastic waste at various temperatures without the need for costly catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If heavy oils are used as heat recovery agents in plastic waste recycling, then heat recovery is achieved, but the ratio of transferring agent to plastic waste increases and energy efficiency decreases
Solution Approach 1:
The invention changes the physical-chemical parameters of the transferring agent by using high molecular weight waxes with specific molecular weight ranges (500-2000) and carbon atom counts (30-100). These parameter changes result in lower viscosity, higher heat capacity, and improved thermal stability, allowing the wax to function effectively at lower ratios (0.5:1 to 2:1) compared to conventional heavy oils, thereby improving energy efficiency while reducing the quantity of transferring agent required
Solution Approach 2:
The invention employs composite material characteristics by selecting waxes that combine properties of both solids and liquids - solid at room temperature but molten at processing temperatures. This composite behavior allows the wax to maintain structural integrity during handling while providing excellent heat transfer properties during processing, achieving superior energy efficiency without requiring high ratios of transferring agent
2Ease of manufacture
If conventional pyrolysis processes are used for plastic waste conversion, then fuel production is achieved, but the process is restricted to specific temperature ranges and requires costly catalysts
Solution Approach 1:
The invention extracts and eliminates the catalyst component from the conventional pyrolysis process. By using high molecular weight waxes as transferring agents, the process achieves effective plastic waste conversion without requiring costly catalysts, thereby improving process economy while maintaining flexibility in temperature range selection
Solution Approach 2:
The invention replaces expensive, long-lasting catalysts with a more economical approach using high molecular weight waxes that can be readily replenished. The waxes serve their purpose as transferring agents and are then regenerated or replaced, providing a cost-effective alternative to traditional catalyst systems and improving overall process economy
3Productivity
If mixed plastic waste is processed, then recycling efficiency improves, but the types of plastic waste that can be processed are limited in conventional processes
Solution Approach 1:
The invention applies universality by designing a pyrolysis process using high molecular weight waxes that can handle multiple types of plastic waste simultaneously. The wax transferring agent provides consistent thermal properties across different plastic compositions, enabling the processing of mixed plastic waste streams including polyethylene, polypropylene, polystyrene, and other polymers, thereby improving recycling efficiency while enhancing adaptability to various plastic types
4Loss of energy
If high molecular weight waxes are used as transferring agents, then energy efficiency improves and heat loss reduces, but the complexity of selecting appropriate wax properties increases
Solution Approach 1:
The invention manages selection complexity by establishing specific parameter ranges for the high molecular weight waxes: molecular weight of 500-2000, carbon atoms of 30-100, and melting points of 80-120°C. These defined parameters create a manageable selection criteria that ensures improved energy efficiency and reduced heat loss while providing clear guidance for wax selection, thereby balancing performance improvement with selection complexity
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 approach enhances processing efficiency, reduces energy consumption, and increases hydrocarbon fuel yields while allowing for the conversion of mixed plastic waste into fuel fractions such as gasoline, kerosene, diesel, and naphtha, making the process more economical and suitable for industrial-scale implementation.
Implementation Method 1
contacting the plastic waste with a transporting agent in a reactor to obtain a first mixture, said first mixture being in a molten state, wherein said transporting agent is a high molecular weight wax
Implementation Method 2
effecting thermal cracking of said filtered molten mixture to obtain an overhead stream and a bottoms stream
Implementation Method 3
subjecting said overhead stream to flashing to obtain a fuel stream and a transporting agent stream
Data Source
AI summary
The present disclosure provides an improved process for conversion of a plastic waste to fuel that is economical. An aspect of the present disclosure provides an improved process for conversion of a plastic waste to fuel, said process including the steps of: (a) contacting the plastic waste with a transporting agent in a reactor to obtain a first mixture, said first mixture being in a molten state, wherein said transporting agent is a high molecular weight wax having carbon atoms ranging from 30 to 100 and molecular weight ranging from 500 to 2000; (b) effecting filtration of said first mixture to obtain a filtered molten mixture; (c) effecting thermal cracking of said filtered molten mixture to obtain an overhead stream and a bottoms stream; and (d) subjecting said overhead stream to flashing to obtain a fuel stream and a transporting agent stream.