Loop Reactor Settling Legs for Linear Alpha Olefins
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Solution Overview
Problem
Current methods for producing linear alpha olefins, such as Fischer-Tropsch synthesis and ethylene oligomerization, face issues like low reaction rates, complex reactor designs, reactor fouling, and dead spots, leading to high production costs and inefficiencies.
Innovation Solution
A loop reactor system is used for oligomerization, which improves reaction homogeneity, temperature control, and reduces fouling and dead spots by incorporating settling legs for byproduct collection, allowing for continuous operation and easier cleaning without disrupting the reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Fischer-Tropsch synthesis is used for linear alpha olefin production, then the process can produce oligomers, but the reaction rate is low and the reactor design is complex
Solution Approach 1:
The patent changes the physical state parameter of the reaction system by using a slurry reactor configuration with liquid phase monomer and catalyst, transforming the conventional gas-phase or high-pressure Fischer-Tropsch process into a liquid-phase slurry system that operates at lower pressures and temperatures, thereby increasing reaction rate while simplifying reactor design
Solution Approach 2:
The patent introduces a solvent as an intermediary medium that dissolves the monomer and catalyst to form a homogeneous slurry, enabling the reaction to proceed efficiently in liquid phase without requiring complex high-pressure equipment, thus improving productivity while reducing device complexity
2Productivity
If conventional oligomerization reactor is used, then linear alpha olefins can be produced, but reactor fouling and dead spots occur which limit efficiency
Solution Approach 1:
The patent employs a loop reactor configuration with curved tubing that eliminates sharp corners and dead zones, ensuring continuous fluid circulation and preventing polymer accumulation in stagnant areas, thereby reducing fouling and eliminating dead spots while maintaining high production efficiency
Solution Approach 2:
The loop reactor design ensures continuous circulation of the slurry through the curved tubing, preventing interruption of the reaction flow and eliminating stagnant zones where fouling could occur, thereby maintaining consistent productivity and reliability throughout operation
3Productivity
If Fischer-Tropsch synthesis is used, then oligomers can be produced, but the product purification process is extensive requiring high capital expenditure
Solution Approach 1:
The patent extracts the polymer byproduct from the reaction mixture in the loop reactor through controlled precipitation or filtration, separating it from the desired oligomer product early in the process, thereby simplifying downstream purification requirements and reducing capital expenditure while maintaining productivity
4Reliability
If settling legs are added to the loop reactor, then byproduct can be collected and fouling reduced, but the reactor structure becomes more complex
Solution Approach 1:
The patent segments the loop reactor by incorporating removable settling legs as separate, detachable components that can be independently accessed and cleaned, adding minimal structural complexity while effectively reducing fouling through periodic maintenance without disrupting the overall reactor operation
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 production efficiency by improving temperature distribution, reducing fouling and dead spots, and simplifying downstream purification, thereby lowering production costs and increasing the efficiency of linear alpha olefin production.
Implementation Method 1
The loop reactor is capable of reducing the formation of dead spots (i.e., accumulated materials) and fouling, resulting in improved production efficiency
Implementation Method 2
The settling legs can be removable for cleaning purposes without disturbing or stopping the oligomerization reaction in the loop reactor
Data Source
AI summary
A system and a method for producing oligomers are disclosed. The oligomers are produced in a loop reactor by contacting a mono-olefin with a catalyst. The byproduct produced during the process is collected in one or more settling legs of the loop reactor.