Oligomerization Catalyst Regeneration with CO2 Purge
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Solution Overview
Problem
Current processes for converting olefins to distillate fuels face challenges in maintaining catalyst activity, particularly in oligomerization catalysts, which require periodic regeneration to prevent coke buildup and maintain efficiency.
Innovation Solution
The process involves in situ regeneration of oligomerization catalyst beds using oxygen gas at elevated temperatures, with carbon dioxide generated from fermentation or catalyst regeneration used to purge the catalyst bed and potentially as a diluent for oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oligomerization catalyst is used continuously to convert olefins to distillate, then productivity is maintained, but coke buildup occurs reducing catalyst activity
Solution Approach 1:
The patent implements periodic catalyst regeneration by alternating between oligomerization operation and regeneration cycles. The catalyst bed is periodically subjected to oxygen-containing gas flow at elevated temperatures to burn off coke deposits, then returned to service. This periodic action maintains catalyst activity while enabling continuous overall productivity through multiple catalyst beds in sequence.
Solution Approach 2:
The patent uses multiple catalyst beds arranged in series or parallel configurations, allowing one bed to be regenerated while others remain in service. This ensures continuous olefin conversion without interruption, as the process can switch between active beds during regeneration cycles, maintaining uninterrupted productivity.
2Reliability
If oxygen gas is introduced to regenerate catalyst at elevated temperature, then coke is removed, but safety risks increase due to potential explosive conditions
Solution Approach 1:
The patent uses carbon dioxide as an intermediary gas introduced before oxygen during catalyst regeneration. The CO2 serves as a protective atmosphere that dilutes oxygen concentration and prevents explosive conditions while still allowing controlled coke combustion. This intermediary approach enables safe catalyst regeneration by eliminating the direct harmful interaction between oxygen and hydrocarbon deposits.
Solution Approach 2:
The patent creates an inert atmosphere using carbon dioxide gas during the catalyst regeneration process. By flooding the catalyst bed with CO2 before and during oxygen introduction, the system maintains an oxygen-deficient environment that prevents uncontrolled combustion and explosive hazards while still permitting controlled oxidation of coke deposits on the catalyst surface.
3Object-affected harmful factors
If carbon dioxide is used to purge catalyst bed before regeneration, then safety is improved by preventing explosive conditions, but process time increases
Solution Approach 1:
The patent performs preliminary carbon dioxide purging of the catalyst bed before introducing oxygen for regeneration. This preliminary action removes flammable hydrocarbon vapors and creates a safe atmosphere for subsequent oxygen introduction. Although this adds time to the regeneration cycle, it prevents dangerous explosive conditions and enables faster overall regeneration by avoiding safety interruptions.
Solution Approach 2:
The patent applies beforehand cushioning by introducing carbon dioxide to cushion or buffer the transition to oxygen-containing atmosphere during catalyst regeneration. The CO2 acts as a protective barrier that prevents direct contact between oxygen and potential fuel sources, cushioning against explosive hazards while enabling the regeneration process to proceed safely and efficiently.
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 effectively regenerates catalysts, maintaining their activity and preventing coke buildup, thereby enhancing the efficiency and sustainability of converting bioethanol to distillate fuels.
Implementation Method 1
regenerates oligomerization catalyst beds in situ by contact with an oxygen gas at elevated temperature
Implementation Method 2
Coke burn
Implementation Method 3
Carbon dioxide generated from fermentation of saccharides to ethanol or from regenerating oligomerization catalyst can be used to purge the oligomerization catalyst bed prior to coke burn
Implementation Method 4
Carbon dioxide generated from fermentation of saccharides to ethanol or from regenerating oligomerization catalyst can be used to purge the oligomerization catalyst bed prior to coke burn and perhaps as a diluent for the oxygen gas
Implementation Method 5
Fermentation produces substantial carbon dioxide which must be managed
Data Source
AI summary
A process for oligomerizing and oligomerizing olefins to distillate fuels which regenerates a first stage oligomerization catalyst bed and/or a second oligomerization catalyst bed in situ by contact with an oxygen gas at elevated temperature. Purge and pressurization of the oligomerization catalyst bed before regeneration and pressure maintenance after regeneration can be achieved with an inert gas provided by carbon dioxide generated from fermenting starches and sugars from biomass to make alcohol or from carbon burn in the regeneration process. The alcohol can also be dehydrated to olefins to provide the olefin charge stream for oligomerization. The oligomerization catalyst can be restored to full activity. A regeneration process can enable continuous operation.