CCR Reformer Catalyst Regeneration for Continuous Aromatics Production
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Solution Overview
Problem
Catalysts used in the aromatization of hydrocarbons lose activity and selectivity over time due to contamination and degradation, leading to inefficient production of aromatic compounds and the need for costly catalyst replacement.
Innovation Solution
A method and system for operating a continuous catalyst regeneration (CCR) reactor system with stationary fixed beds, utilizing a reforming catalyst comprising Group VIII metal and zeolitic support, and incorporating a purge and regeneration process to extend catalyst life and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional aromatization catalysts are used continuously, then production of aromatic compounds is maintained, but catalyst activity and selectivity deteriorate over time due to contamination and degradation
Solution Approach 1:
The patent implements a catalyst regeneration system that periodically removes spent catalyst from the reactor and replaces it with fresh catalyst. This recovery process restores catalyst activity and selectivity by removing accumulated contaminants and degraded sites, thereby resolving the contradiction between continuous production and catalyst deterioration.
Solution Approach 2:
The patent maintains continuous operation of the aromatization process by implementing overlapping catalyst replacement cycles. While some catalyst is being replaced, other catalyst remains active in the reactor, ensuring uninterrupted production of aromatic compounds. This continuous action eliminates downtime and maintains productivity while addressing catalyst degradation.
2Reliability
If spent catalyst is replaced with fresh catalyst, then catalyst activity is restored, but production downtime and operational costs increase
Solution Approach 1:
The patent performs catalyst regeneration and preparation activities before the actual catalyst replacement in the reactor. Spent catalyst is removed and fresh catalyst is prepared and pre-heated in advance, so that when replacement occurs, the reactor can be quickly brought back to operational conditions. This preliminary action minimizes downtime and maintains continuous production.
Solution Approach 2:
The patent implements a dynamic catalyst management system where catalyst replacement occurs continuously rather than in large batch replacements. Catalyst is added and removed in controlled rates during operation, allowing the system to adapt catalyst composition in real-time without shutting down production. This dynamic approach eliminates downtime while maintaining high catalyst activity.
3Reliability
If catalyst replacement is performed frequently, then catalyst performance is maintained, but operational costs and resource consumption increase
Solution Approach 1:
The patent implements monitoring systems that track catalyst performance parameters such as conversion rates, selectivity, and activity over time. This feedback information is used to determine the optimal timing for catalyst replacement, ensuring that catalyst is replaced only when performance deteriorates to unacceptable levels. This feedback-based approach maximizes catalyst utilization and minimizes unnecessary replacement, reducing operational costs and resource consumption.
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 CCR system effectively regenerates and reuses the catalyst, reducing downtime and costs by maintaining catalyst activity and selectivity over extended periods, up to 365 days or more, without the need for upstream sulfur converter adsorbers.
Implementation Method 1
each radial flow reactor containing a reforming catalyst capable of catalyzing the conversion of hydrocarbons in a hydrocarbon feed to provide a reactor effluent comprising aromatic hydrocarbons
Implementation Method 2
the reforming catalyst comprises a Group VIII metal, a zeolitic support, and at least one halogen
Data Source
AI summary
The present disclosure relates to the aromatization of hydrocarbons with an aromatization catalyst, including methods of aromatization comprising the use of a continuous catalyst regeneration type reformer.