Fluidized Catalytic Cracking of Plastic Pyrolysis Oil
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Solution Overview
Problem
The challenge lies in effectively utilizing pyrolysis products from plastic pyrolysis due to the presence of residues from additives, which are toxic and require further processing to generate useful products, such as transportation fuels and petrochemical feedstocks.
Innovation Solution
The method involves conducting pyrolysis of a plastic feedstock to produce plastic pyrolysis oil, which is then fed into a fluidized catalytic cracking (FCC) process, where it is cracked over a catalyst bed to produce olefins and distillate fuels, with the spent catalyst being regenerated and reused, thereby addressing the issue of additive residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If pyrolysis is conducted on plastic feedstock to produce pyrolysis oil, then plastic waste is converted into useful products, but toxic residues from additives remain in the pyrolysis products requiring further processing
Solution Approach 1:
The patent extracts and removes toxic residues from the pyrolysis oil through a series of processing units including a decant器 that separates the oil into layers, allowing the toxic residue layer to be removed. This extraction process isolates the harmful substances from the useful pyrolysis oil, resolving the contradiction between waste utilization and harmful residue removal.
Solution Approach 2:
The patent converts the toxic residues into a benefit by using them as a fuel source. The removed residue layer is burned in a furnace to generate heat, which is then used to power the pyrolysis process itself. This transforms the harmful waste product into a useful energy source, eliminating the need for external fuel and turning the harmful factor into a benefit.
2Reliability
If further processing is conducted to remove toxic residues, then product quality is improved, but process complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated units. The decant器 serves both as a separation device for removing toxic residues and as a means to prepare the oil for subsequent processing. The furnace integrates waste residue burning with heat generation for the pyrolysis process. This merging of functions reduces overall system complexity while maintaining product quality.
Solution Approach 2:
The system is designed to be self-sufficient by using the toxic residues themselves as the fuel source for the pyrolysis process. The heat required for pyrolysis is generated by burning the removed residues, eliminating the need for external fuel supplies and reducing the complexity of fuel management systems.
3Productivity
If pyrolysis oil is used as feedstock for fluidized catalytic cracking, then valuable products like olefins and distillate fuels are produced, but the presence of residues may affect catalyst performance
Solution Approach 1:
The patent performs preliminary cleaning of the pyrolysis oil before it enters the fluidized catalytic cracking unit. The decant器 removes toxic residues in advance, and the cleaned oil is then fed to the cracking process. This preliminary action prevents catalyst poisoning and maintains high catalyst performance throughout the production process.
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 enables the conversion of plastic pyrolysis oil into valuable products like olefins and distillate fuels, effectively utilizing the pyrolysis products and minimizing the impact of toxic residues, thus providing a sustainable method for plastic waste processing.
Implementation Method 1
conducting pyrolysis of a plastic feedstock to produce a stream of plastic pyrolysis oil
Implementation Method 2
cracking the catalytic cracking feed stream in the fluidized bed reactor to produce a product stream and a spent catalyst
Implementation Method 3
feeding a catalytic cracking feed stream and a catalyst from a catalyst regenerator into a fluidized bed reactor
Implementation Method 4
transporting the spent catalyst to the catalyst regenerator and regenerating the catalyst in the catalyst regenerator
Data Source
AI summary
Methods and systems for producing pyrolysis products from a mixed plastics stream are described herein. The method may include conducting pyrolysis of a plastic feedstock to produce a stream of plastic pyrolysis oil; feeding a catalytic cracking feed stream and a catalyst from a catalyst regenerator into a fluidized bed reactor, where the catalytic cracking feed stream comprises the plastic pyrolysis oil; cracking the catalytic cracking feed stream in the fluidized bed reactor to produce a product stream and a spent catalyst; and transporting the spent catalyst to the catalyst regenerator and regenerating the catalyst in the catalyst regenerator. The product stream comprises olefins having a carbon number of C2-C4 and distillate fuel.