Acid Condensation Catalyst Regeneration With O2-CO2 Gas Recycling
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Solution Overview
Problem
The deactivation of acid condensation catalysts due to coke formation is a significant issue in petrochemical and energy transformation industries, necessitating cost-effective and efficient methods for catalyst regeneration.
Innovation Solution
A method involving the use of a regeneration process to the AC reactor, the method includes the use of a regeneration feed gas comprising oxygen and carbon dioxide to react with a fouled acid condensation reactor, followed by a process of fractionating the effluent gas into a liquid and vapor phase, mixing the vapor phase with oxygen or air to regenerate the catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the catalyst is used continuously for hydrocarbon production, then productivity is improved, but coke buildup deactivates the catalyst over time
Solution Approach 1:
The patent implements periodic catalyst regeneration by alternating between hydrocarbon production mode and catalyst regeneration mode. The AC reactor is operated in production mode during daytime hours and switched to regeneration mode during nighttime hours, allowing the catalyst to be restored periodically without stopping overall operations. This periodic switching resolves the contradiction by maintaining productivity over time while addressing catalyst deactivation.
Solution Approach 2:
The patent recovers and reuses the CO2 produced during catalyst regeneration by injecting it into the AC reactor during production mode. This transforms the harmful CO2 byproduct into a useful component that suppresses unwanted cracking reactions and enhances desired hydrocarbon production, thereby recovering a resource that would otherwise be wasted and further improving productivity.
2Reliability
If the catalyst is regenerated by burning coke off at high temperature, then catalyst activity is restored, but energy consumption increases
Solution Approach 1:
The patent merges the catalyst regeneration function with the AC reactor itself, eliminating the need for a separate regeneration reactor. By integrating both production and regeneration operations in a single reactor, the system reduces overall energy consumption and equipment requirements while maintaining catalyst activity through periodic regeneration cycles.
Solution Approach 2:
The patent employs a self-sustaining regeneration process where CO2 produced during regeneration is recycled and used to suppress cracking reactions during subsequent production mode. This self-service approach reduces external energy inputs and material requirements, allowing the system to maintain itself with minimal additional energy consumption.
3Reliability
If air is used for catalyst regeneration, then oxygen is supplied for coke combustion, but nitrogen in air reduces regeneration efficiency
Solution Approach 1:
The patent changes the compositional parameters of the regeneration gas from air (containing nitrogen) to pure oxygen or oxygen-enriched mixtures. This parameter change eliminates the diluting effect of nitrogen, allowing more efficient coke combustion at lower oxygen concentrations and reducing the total gas volume required for effective regeneration, thereby improving regeneration efficiency.
4Reliability
If high oxygen concentration is used for regeneration, then coke combustion is enhanced, but unwanted cracking reactions increase
Solution Approach 1:
The patent changes the chemical composition parameter by introducing CO2 into the regeneration gas mixture. This parameter change allows the system to achieve effective coke removal at lower oxygen concentrations, since CO2 suppresses cracking reactions by altering the reaction environment. The CO2 acts as a cracking inhibitor while still permitting sufficient oxygen for coke combustion, thereby resolving the contradiction between effective regeneration and unwanted byproduct formation.
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 method effectively regenerates the acid condensation catalyst, reducing coke buildup and maintaining catalyst activity, thereby enhancing the efficiency of hydrocarbon production processes.
Implementation Method 1
reacting a fouled acid condensation catalyst in an AC reactor with a regeneration feed gas comprising oxygen (O2) at a regeneration temperature to produce a regenerated acid condensation catalyst and an effluent gas comprising carbon dioxide (CO2)
Implementation Method 2
fractionating the effluent gas into a liquid phase containing water and a vapor phase
Implementation Method 3
fractionating the effluent gas into a liquid phase containing water and a vapor phase
Implementation Method 4
mixing at least a portion of the vapor phase with O2, CO2, air, or a combination thereof to form the regeneration feed gas
Data Source
AI summary
The present disclosure provides a method for regenerating an acid condensation catalyst including reacting a fouled acid condensation catalyst in an acid condensation (AC) reactor with a regeneration feed gas comprising oxygen (O2) at a regeneration temperature to produce a regenerated acid condensation catalyst and an effluent gas comprising carbon dioxide (CO2). The method further includes fractionating the effluent gas into a liquid phase containing water and a vapor phase, (iii) mixing at least a portion of the vapor phase with O2, CO2, air, or a combination thereof to form the regeneration feed gas; and (iv) introducing the regeneration feed gas to the AC reactor to continue the reaction of step (i).