Alkylation Reactor Effluent Recirculation for Benzene Recovery
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Solution Overview
Problem
Current methods for producing alkylbenzenes and regenerating alkylation catalysts are inefficient, leading to high costs and energy requirements due to the need for frequent catalyst regeneration and the use of fresh benzene in the alkylation process.
Innovation Solution
A process involving the recycling of the product stream and regenerant stream, where a portion of the benzene regeneration stream is routed back to the alkylation reactor, reducing the need for fresh benzene and optimizing the alkylation reaction conditions, including temperature and catalyst selection, to enhance the yield and selectivity of alkylated aromatic compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If catalyst regeneration is performed frequently to maintain alkylation activity, then catalyst performance is improved, but energy consumption and production costs increase
Solution Approach 1:
The patent implements continuous catalyst regeneration within the alkylation reactor system, maintaining catalyst activity without interrupting the alkylation process. The regenerated catalyst remains in the reactor, ensuring continuous useful action and eliminating the need for separate regeneration cycles that would consume additional energy and time.
Solution Approach 2:
The patent combines the alkylation reaction and catalyst regeneration functions into a single integrated reactor system. The reactor simultaneously performs olefin alkylation and catalyst regeneration by circulating reactor effluent containing regenerated catalyst back into the reaction zone, eliminating the need for separate regeneration equipment and reducing energy consumption.
2Productivity
If fresh benzene is continuously supplied to the alkylation reactor to maintain reaction conditions, then alkylation efficiency is improved, but benzene consumption and costs increase
Solution Approach 1:
The patent recycles reactor effluent containing unreacted benzene and regenerated catalyst back into the alkylation reactor. This recovery and reuse of benzene reduces fresh benzene consumption while maintaining adequate benzene levels in the reactor for continuous efficient alkylation.
Solution Approach 2:
The patent implements a feedback loop where reactor effluent is circulated back to the reactor inlet, creating a closed system that maintains benzene concentration within the reactor. This feedback mechanism ensures continuous alkylation efficiency while minimizing benzene loss through systematic recovery and reuse.
3Reliability
If reactor effluent is circulated back to the reactor to regenerate catalyst, then catalyst activity is maintained, but process complexity increases
Solution Approach 1:
The patent designs the alkylation reactor to serve multiple functions simultaneously: it performs olefin alkylation, separates products, and regenerates catalyst. This multi-functionality eliminates the need for separate regeneration equipment, reducing process complexity while maintaining catalyst activity through effluent circulation.
Solution Approach 2:
The patent merges the alkylation reaction zone and catalyst regeneration zone into a single integrated reactor system. By combining these functions and circulating effluent within the same reactor, the process complexity is minimized while ensuring continuous catalyst activity through in-situ regeneration.
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 reduces the overall benzene consumption, lowers energy requirements, and improves the selectivity and yield of linear alkylbenzenes, thereby decreasing production costs and environmental impact.
Implementation Method 1
regenerating of the spent alkylation reaction zone comprising passing an aromatics stream through the spent alkylation reaction zone at a regeneration temperature
Implementation Method 2
passing an aromatic feedstock comprising aromatic compounds and an olefin feedstock comprising olefins having from 8 to 20 carbon atoms to an alkylation reaction zone under alkylation reaction conditions to generate an alkylation process stream comprising alkylated aromatic compounds
Data Source
AI summary
A process for producing alkylaromatic compounds is described. The process involves utilizing at least a portion of the aromatic compound used to regenerate the alkylation catalyst in a spent alkylation reaction zone as a reactant in the active alkylation reaction zone. The process further includes utilizing a portion of the process stream leaving the alkylation zone as a recycle stream to the alkylation zone.