Dual-Reactor Plastic Oil Upgrading With Separate Catalyst Regeneration
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Solution Overview
Problem
Plastic derived oils contain halogen-containing compounds and contaminants that pose challenges in direct use for catalytic cracking due to corrosion, catalyst poisoning, and environmental impact, necessitating effective decontamination and conversion processes.
Innovation Solution
A dual reactor system with separate decontamination and cracking catalysts, utilizing fluidized bed reactors and dedicated regenerators, to remove halogen compounds and contaminants, followed by catalytic cracking to produce higher value chemical products and intermediates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plastic derived oil is directly used for catalytic cracking, then the process is simple and fast, but halogen-containing compounds cause corrosion, catalyst poisoning, and environmental harm
Solution Approach 1:
The system divides the processing into two separate reactors: a first reactor for decontamination and a second reactor for cracking. This segmentation allows each reactor to be optimized for its specific function, enabling direct use of plastic derived oil for cracking while preventing harmful effects through dedicated decontamination in the first reactor
Solution Approach 2:
The decontamination catalyst in the first reactor acts as an intermediary that removes halogen-containing compounds before the oil enters the cracking reactor. This intermediary step protects the cracking catalyst from poisoning and prevents corrosion downstream while maintaining processing efficiency
2Device complexity
If a single reactor system is used for both decontamination and cracking, then the device complexity is low, but the cracking catalyst is damaged by halogen compounds
Solution Approach 1:
The system uses two separate reactors with dedicated catalysts for each function. The first reactor contains decontamination catalyst while the second contains cracking catalyst, preventing contact between halogen compounds and the cracking catalyst, thus maintaining catalyst stability without excessive complexity
Solution Approach 2:
The harmful halogen-containing compounds are extracted and removed in the first reactor before the oil enters the second reactor. This extraction protects the cracking catalyst from damage while maintaining a relatively simple overall system structure
3Reliability
If separate catalyst regenerators are used for decontamination and cracking catalysts, then catalyst performance is optimized, but the system complexity increases
Solution Approach 1:
The system employs separate regenerators for each catalyst type, allowing each regenerator to be optimized for its specific catalyst's regeneration requirements. This segmentation maintains high catalyst performance while using a modular approach that manages system complexity
Solution Approach 2:
Each regenerator is designed with local quality tailored to its specific catalyst - the decontamination catalyst regenerator handles halogen-rich environments while the cracking catalyst regenerator operates in a cleaner environment. This localized optimization maintains catalyst performance without requiring a completely different system architecture
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 system effectively reduces halogen content, prevents catalyst degradation, and produces valuable chemical intermediates and low carbon footprint fuels, addressing downstream issues and enabling broader plastic waste recycling.
Implementation Method 1
contacting the plastic derived oil stream with the decontamination catalyst in the first reactor to produce a first reactor effluent having a reduced concentration of halogen-containing compounds
Implementation Method 2
contacting the plastic derived oil stream with the decontamination catalyst in the first reactor to produce a first reactor effluent having a reduced concentration of halogen-containing compounds
Implementation Method 3
The first reactor may be a fluidized bed reactor
Implementation Method 4
contacting the at least a portion of the first reactor effluent with a cracking catalyst in the second reactor to produce a second reactor effluent comprising light olefins
Implementation Method 5
a decontamination catalyst regenerator...configured to regenerate the used decontamination catalyst; a cracking catalyst regenerator...configured to regenerate the used cracking catalyst
Data Source
AI summary
A process for upgrading plastic derived oil includes contacting a plastic derived oil stream with a decontamination catalyst in a first reactor, separating a first reactor effluent from a used decontamination catalyst, passing the first reactor effluent to a second reactor downstream of the first reactor, contacting the first reactor effluent with a cracking catalyst in the second reactor, and separating a second reactor effluent from a used cracking catalyst. The cracking catalyst is different from the decontamination catalyst. The process further includes regenerating the used decontamination catalyst in a decontamination catalyst regenerator to produce regenerated decontamination catalyst, and regenerating the used cracking catalyst in a cracking catalyst regenerator separate from the decontamination catalyst regenerator to produce regenerated cracking catalyst. Regenerating the used cracking catalyst separately reduces deactivation of the cracking catalyst by halogen-containing compounds produced during regeneration of the decontamination catalyst.