Plastic Pyrolysis Reactor Catalyst Separation
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Solution Overview
Problem
Current pyrolysis processes for plastic feeds face challenges such as low throughput and yield due to corrosion from chlorine in waste plastics, inefficient dechlorination processes, and insufficient regeneration of spent catalysts, leading to reduced productivity and product quality.
Innovation Solution
A process and apparatus for pyrolyzing plastic feeds involve introducing a plastic melt and catalyst into a reactor, with specific conduit arrangements for product and catalyst removal, and using a separator to form catalyst-rich and ash-rich phases, allowing for efficient regeneration of catalysts and improved separation of ash, thereby enhancing throughput and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cracking apparatus are used for plastic feeds, then cracking of plastic into useful products is achieved, but high temperatures are required and throughput is reduced
Solution Approach 1:
The patent changes the temperature parameter by operating at lower temperatures (below 500°F) compared to conventional high-temperature processes, while adjusting other parameters such as catalyst type and feedstock preparation to maintain productivity
Solution Approach 2:
The patent introduces a catalyst as an intermediary substance that enables the cracking reaction to proceed at lower temperatures, mediating between the plastic feedstock and the desired hydrocarbon products
2Reliability
If dechlorination process is added before reactor, then corrosion from chlorine is prevented, but throughput and yield are reduced
Solution Approach 1:
The patent uses a catalyst as an intermediary that simultaneously performs cracking and dechlorination functions, eliminating the need for a separate dechlorination step while protecting against corrosion
Solution Approach 2:
The patent merges the cracking and dechlorination processes into a single integrated reaction zone, combining multiple functions that were previously performed separately to improve throughput
3Ease of repair
If spent catalyst is regenerated in conventional regenerator, then catalyst is recovered, but regeneration is insufficient especially with chlorine and trace metals
Solution Approach 1:
The patent changes the regeneration parameters by using higher temperatures and different atmospheric conditions to effectively remove chlorine and trace metals from the spent catalyst, achieving superior regeneration quality
4Reliability
If separate dechlorination steps are added, then corrosion is prevented, but yield of desired cracked products is reduced
Solution Approach 1:
The patent combines dechlorination with the main cracking process in a single reaction zone, eliminating separate dechlorination steps that would reduce yield while maintaining corrosion protection through catalyst selection
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 higher yields and throughput of pyrolysis products, extends the life cycle of apparatus components, and improves catalyst regeneration, reducing plugging and wear, while maintaining high purity of recycled catalysts.
Implementation Method 1
introducing the catalyst from the third conduit to a separator to form a catalyst-rich phase and an ash-rich phase in the separator
Implementation Method 2
pyrolyzing the plastic component to form a pyrolysis product
Data Source
AI summary
The present disclosure relates to apparatus and processes for pyrolysis of feeds, such as plastic feeds. In at least one embodiment, a process includes introducing a plastic melt including a plastic component into a reactor via a nozzle coupled with the reactor. The process includes introducing a catalyst into the reactor via a first conduit coupling the reactor with a riser or a regenerator. The process includes pyrolyzing the plastic component to form a pyrolysis product. The process includes removing the pyrolysis product from the reactor via a second conduit disposed at a top ½ height of the reactor. The process includes removing the catalyst from the reactor via a third conduit disposed at a bottom ½ height of the reactor, wherein the catalyst removed from the reactor comprises ash.