Ethylene Oligomerization Reactor with External Motion Driver
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Solution Overview
Problem
Loop dimerization systems for producing 1-butene from ethylene face issues with polymer and oligomer fouling, leading to frequent process shutdowns, increased maintenance costs, and reduced efficiency due to poor heat transfer and mixing, as well as the formation of 'hot spots' that can cause runaway reactions.
Innovation Solution
An ethylene oligomerization system with an internal baffle single pass reactor and an exterior motion driver that induces unsteadiness in the process fluid, allowing for effective separation of catalysts and products, and the controlled introduction of catalyst inhibitors to prevent fouling and optimize reaction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If loop dimerization systems are used to produce 1-butene from ethylene, then oligomerization reaction occurs, but polymer and oligomer fouling occurs leading to frequent process shutdowns
Solution Approach 1:
The harmful polymerization reaction is extracted and isolated into a separate catalyst deactivation zone downstream of the oligomerization reaction zone. This allows the desired oligomerization to proceed while the harmful polymerization is contained and terminated in a dedicated zone, preventing fouling and maintaining process reliability.
Solution Approach 2:
The reactor is segmented into distinct zones: an oligomerization reaction zone and a catalyst deactivation zone. This segmentation allows different chemical processes to occur in separate spatial regions, enabling continuous operation by preventing polymer buildup that would otherwise cause shutdowns.
2Productivity
If long residence times are used in loop dimerization systems, then oligomerization reaction efficiency improves, but polymer fouling increases due to poor heat removal
Solution Approach 1:
The reactor is divided into an oligomerization reaction zone where long residence times enhance reaction efficiency, and a separate catalyst deactivation zone that handles heat removal and polymer prevention. This spatial segmentation allows both long residence times for efficiency and effective heat management to coexist.
Solution Approach 2:
The highly exothermic nature of the oligomerization reaction, which causes fouling, is converted into a benefit by using the reaction heat to drive the process while the separate deactivation zone manages thermal control. The deactivation zone captures and neutralizes the harmful thermal effects that would otherwise cause polymer fouling.
3Object-affected harmful factors
If catalyst inhibitors are added to halt polymerization in loop reactors, then fouling is reduced, but the desirable oligomerization reaction is interfered with
Solution Approach 1:
The reactor is segmented into an oligomerization reaction zone free of inhibitors where productive reaction occurs, and a downstream catalyst deactivation zone where inhibitors are introduced to halt polymerization. This spatial separation ensures that catalyst inhibition only affects unwanted polymerization while leaving the desired oligomerization unaffected.
Solution Approach 2:
The oligomerization reaction proceeds completely in the first zone before any catalyst deactivation occurs. The catalyst is deactivated in a preliminary manner in the second zone, ensuring that the productive reaction is not interfered with while still preventing fouling downstream.
4Object-affected harmful factors
If reduced temperatures or production rates are used to avoid polymer fouling, then fouling is reduced, but mixing effectiveness and heat transfer deteriorate
Solution Approach 1:
The reactor is segmented into zones with different operational characteristics. The oligomerization zone can operate at optimal temperatures and production rates for efficient mixing and heat transfer, while the deactivation zone handles thermal management to prevent fouling, allowing both high productivity and effective heat transfer to coexist.
Solution Approach 2:
The catalyst deactivation zone acts as an intermediary that mediates between the high-energy oligomerization reaction and the need to prevent fouling. It provides a buffer zone where thermal effects are managed without compromising the mixing and heat transfer in the main reaction zone.
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 reduces fouling and hot spots, enhances mixing and heat transfer, and allows for easier control of the oligomerization process, resulting in improved efficiency and reliability by preventing undesired reactions and maximizing desirable product formation.
Implementation Method 1
The exterior motion driver is operable to induce unsteadiness in the flow of the process fluid contained in the internal baffle single pass reactor by transferring motion into the process fluid
Implementation Method 2
an oligomerization catalyst forms in the process fluid from the reaction of the oligomerization pre-catalyst and the co-catalyst in the oligomerization reaction zone, 1-butene forms in the process fluid from the oligomerization reaction of ethylene in the presence of the oligomerization catalyst
Implementation Method 3
a deactivated oligomerization catalyst forms in the process fluid from the reaction of the oligomerization catalyst and the catalyst inhibitor in the catalyst deactivation zone
Data Source
AI summary
An ethylene oligomerization system is useful for creating 1-butene from ethylene in the presence of an ethylene oligomerization catalyst. The ethylene oligomerization system includes an internal baffle single pass reactor, a separation system and an external motion driver. The external motion driver is operable to induce unsteadiness in the flow of the process fluid contained in the internal baffle single pass reactor by transferring motion into the process fluid. An ethylene oligomerization process is useful for creating a refined 1-butene product from ethylene using the ethylene oligomerization system.