Continuous Fatty Alcohol Production via Dual Shaft Reactor Segmentation
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Solution Overview
Problem
Existing systems for continuous fatty alcohol production by catalytic trickle bed hydrogenation require shutdown for catalyst replacement and do not fully utilize the lowest part of the catalyst bed, leading to inefficiencies and reduced catalyst service life.
Innovation Solution
A system with two shaft reactors connected in series, allowing for selective flow and bypassing, with quench hydrogen injection below the catalyst bed or in the transfer line, and temperature monitoring to manage temperature increases and enable continuous catalyst replacement without interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single fixed catalyst bed is used in continuous fatty alcohol production, then the system is simple to operate, but the system must be shut down for catalyst replacement and the lowest part of the catalyst bed cannot be fully utilized
Solution Approach 1:
The single catalyst bed is divided into two separate shaft reactors (Reactor 1 and Reactor 2), each containing its own catalyst bed. This segmentation allows one reactor to be in operation while the other undergoes catalyst replacement, enabling continuous production without shutdowns.
Solution Approach 2:
A bypass line with a bypass valve is pre-configured in the system. When catalyst replacement is needed in one reactor, the bypass valve can be activated to redirect the educt mixture through the bypass line, allowing catalyst replacement to occur without interrupting the overall production process.
2Object-affected harmful factors
If quench hydrogen is introduced into the fixed catalyst bed to limit temperature increase, then the formation of undesirable by-products is reduced, but the system complexity increases and catalyst service life is not extended
Solution Approach 1:
Instead of introducing quench hydrogen into the catalyst bed (horizontal dimension), the invention applies quenching in the vertical dimension by positioning the quench hydrogen injection point below the catalyst bed, utilizing the vertical space and flow direction to achieve temperature control more efficiently.
Solution Approach 2:
The quench hydrogen system is integrated with the existing hydrogen circulation system. The quench hydrogen is taken from the hydrogen circulation line, and the same hydrogen serves dual purposes: as a reactant in the hydrogenation reaction and as a quenching medium to control temperature, eliminating the need for a separate quench hydrogen supply system.
3Duration of action of stationary object
If the catalyst bed is divided into multiple reactors to extend catalyst service life, then catalyst life is extended, but the system complexity increases and full utilization of the catalyst bed is still not achieved
Solution Approach 1:
The two reactors are configured to operate in sequence with continuous catalyst utilization. While one reactor is using fresh catalyst, the other is being regenerated or replaced. The bypass system ensures continuous flow, maintaining uninterrupted production and ensuring that catalyst activity is continuously utilized without idle periods.
Solution Approach 2:
The system enables selective deactivation and replacement of catalyst in one reactor while maintaining operation in the other. The bypass line allows the educt mixture to be redirected, enabling the discarded (deactivated) catalyst in one reactor to be replaced while the other reactor continues to utilize its catalyst fully, optimizing overall catalyst recovery and replacement efficiency.
4Object-affected harmful factors
If temperature monitoring is implemented to manage temperature increases, then the formation of undesirable by-products is reduced, but the device complexity increases
Solution Approach 1:
Temperature monitoring devices are installed in both shaft reactors to detect temperature increases during operation. The temperature data from these devices provides feedback to the control system, which can then adjust process parameters or activate the bypass valve to prevent excessive temperature rise and formation of undesirable by-products.
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 configuration allows for continuous operation during catalyst exchange, full utilization of the catalyst bed, and reduced formation of undesirable by-products, extending catalyst life and optimizing production efficiency.
Implementation Method 1
catalytic trickle bed hydrogenation
Implementation Method 2
hydrogenation is exothermic
Implementation Method 3
quenching takes place below the catalyst bed or beds and/or in the transfer line between the reactors
Implementation Method 4
temperature measuring devices are installed in the shaft reactors to visualize the temperature progression over the length of the fixed bed
Data Source
Figure 1
AI summary
Plant and process for carrying out the continuous production of fatty alcohol from fatty acid esters by catalytic trickle-bed hydrogenation, comprising at least one shaft reactor containing a fixed-bed catalyst, which are connected to each other via pipelines in such a way that they can be flowed through by the reactant/product mixture one after the other, in a freely selectable sequence, or individually.