Plastic Pyrolysis Catalyst Composition for Olefin Yield
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Solution Overview
Problem
Current methods for converting waste plastics into petrochemicals like olefins and aromatics are inefficient, often resulting in high methane production and are not scalable for large commercial operations due to long residence times and reliance on steam cracker furnaces.
Innovation Solution
A pyrolysis process using a catalyst composition of spent FCC catalysts and ZSM-5 zeolite, operating at temperatures between 570°C to 680°C, which converts plastics into high yields of light gas olefins and aromatics with low methane production, suitable for large-scale commercial operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If small scale plants are used for plastics conversion, then liquid fuels can be generated, but the residence times are long making them unsuitable for large scale continuous operations
Solution Approach 1:
The patent changes the operating parameters by using temperatures of 450°C to 750°C and specific catalyst-to-feed ratios to achieve rapid conversion in continuous flow reactors, reducing residence time while maintaining high production volumes
Solution Approach 2:
The patent implements continuous operation of pyrolysis reactors with continuous feedstock introduction and product removal, eliminating the batch processing limitations of small scale plants and enabling large scale production with reduced residence times
2Quantity of substance
If steam cracker furnaces are used for plastics conversion, then feedstocks can be produced, but high amounts of methane are generated which is undesirable
Solution Approach 1:
The patent introduces catalysts as intermediaries between the plastic feedstock and the final olefin products. The catalysts facilitate selective bond breaking and reforming reactions that produce olefins while minimizing methane formation, acting as a mediator to control the reaction pathway
Solution Approach 2:
The patent optimizes reaction parameters including temperature (450°C to 750°C), pressure, and catalyst-to-feed ratios to favor olefin production pathways over methane formation, using parameter control to selectively enhance desired products while suppressing unwanted byproducts
3Manufacturing precision
If specialized catalysts including zeolite catalysts are used, then specific aromatic products can be produced, but the device complexity increases
Solution Approach 1:
The patent uses composite catalyst systems combining different catalyst components (including zeolites and other catalysts) to achieve multiple functions in a single system, producing both aromatics and olefins with high selectivity while managing complexity through integrated catalyst design
Solution Approach 2:
The patent employs catalysts that can perform multiple functions simultaneously, including cracking, aromatization, and olefin production, allowing a single catalyst system to produce multiple valuable product streams with high selectivity without requiring separate specialized reactors for each product type
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
The process achieves high yields of valuable olefins and aromatics while minimizing methane production, making it economically viable for large-scale commercial operations by utilizing a combination of spent FCC catalysts and ZSM-5 zeolite in a pyrolysis process.
Implementation Method 1
A pyrolysis process using a catalyst composition of spent FCC catalysts and ZSM-5 zeolite, operating at temperatures between 570°C to 680°C, which converts plastics into high yields of light gas olefins and aromatics
Implementation Method 2
The invention relates to the conversion of plastics and other hydrocarbons to olefin and aromatics through pyrolysis
Implementation Method 3
A pyrolysis process using a catalyst composition of spent FCC catalysts and ZSM-5 zeolite
Data Source
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AI summary
A method of producing olefins and aromatic compounds from a feedstock is accomplished by introducing a hydrocarbon feedstock and a catalyst composition within a reactor. At least a portion of the reactor is at a reactor temperature of from 470°C to 730°C. The catalyst composition is comprised of a fluidized catalytic cracking (FCC) catalyst and a ZSM-5 zeolite catalyst, wherein the amount of ZSM-5 zeolite catalyst makes up from greater than 0 wt.% of the total weight of the FCC catalyst and the ZSM-5 zeolite catalyst. At least a portion of the feedstock is converted to products of at least one of olefins and aromatic compounds within the reactor, with at least some of the products being contained in a liquid product stream. At least a portion of the liquid product stream is directed to different downstream processes to increase production of at least one of olefins and aromatic compounds.