Combined XTO-OC Olefin Process with Zeolite Catalyst
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Solution Overview
Problem
Current processes for producing hydrocarbon products like olefins and aromatics are limited by the increasing cost and scarcity of crude oil, and existing methods for converting oxygen-containing organic compounds to olefins are inefficient in terms of catalyst longevity and product selectivity.
Innovation Solution
A combined XTO-OC process using a zeolitic molecular sieve catalyst with a 10-membered ring pore structure, where the catalyst circulates between three zones: an XTO reaction zone for converting oxygen-containing compounds to ethylene and propylene, an OC reaction zone for converting C4-C7 olefins to aromatics and additional ethylene and propylene, and a catalyst regeneration zone, with selective deactivation to enhance catalyst performance and reduce undesirable by-products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a combined XTO-OC process is used to increase production of aromatics and olefins, then productivity is improved, but device complexity increases due to multiple reaction zones and catalyst circulation systems
Solution Approach 1:
The patent combines the XTO process and OC process into a single integrated system with shared catalyst circulation and regeneration infrastructure. The catalyst serves dual functions in both reaction zones, and the regeneration zone serves both processes, thereby increasing productivity while managing device complexity through functional integration rather than separate independent systems
Solution Approach 2:
The catalyst exhibits multi-functionality by participating in both XTO reactions (converting oxygenates to olefins) and OC reactions (converting heavy olefins to aromatics and light olefins). The same catalyst material and regeneration system serve both processes, allowing the system to achieve higher overall productivity without proportionally increasing device complexity
2Duration of action of stationary object
If catalyst is continuously circulated between reaction zones and regeneration zone, then catalyst longevity is improved, but loss of time increases due to transport and regeneration cycles
Solution Approach 1:
The catalyst circulation system operates continuously with multiple parallel pathways: catalyst flows from XTO zone to regeneration zone, and simultaneously from OC zone to regeneration zone. The regeneration zone continuously processes catalyst from both sources, ensuring that catalyst is constantly active in productive reactions while undergoing periodic regeneration, thereby extending catalyst life while minimizing time loss through continuous operation rather than batch cycles
Solution Approach 2:
The system dynamically balances catalyst distribution between the two reaction zones based on their respective needs. Catalyst circulation rates and regeneration timing are optimized to ensure that catalyst spends appropriate time in each reaction zone versus regeneration, maximizing both catalyst longevity and minimizing idle time through dynamic adjustment of flow rates and operational parameters
3Manufacturing precision
If selective deactivation is applied to enhance catalyst performance and reduce by-products, then manufacturing precision is improved, but device complexity increases due to controlled deactivation processes
Solution Approach 1:
Selective deactivation applies different levels of catalyst activity to different reaction zones. The XTO zone receives catalyst with optimal activity for oxygenate conversion, while the OC zone receives catalyst with modified activity characteristics suited for heavy olefin cracking. This local differentiation of catalyst properties enhances product selectivity and reduces unwanted by-products in each zone without requiring complex external control systems, as the deactivation is tailored to each zone's specific requirements
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 process achieves high conversion rates and selectivity for ethylene and propylene, while extending catalyst life and reducing undesirable by-products, optimizing reaction conditions in each zone and utilizing heat integration for efficient energy management.
Implementation Method 1
converting oxygen-containing compounds to ethylene and propylene over a zeolitic molecular sieve catalyst
Implementation Method 2
converting C4-C7 olefins to aromatics and additional ethylene and propylene
Implementation Method 3
catalyst regeneration zone
Data Source
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AI summary
The present invention relates to a process to make light olefins and aromatics, in a combined XTO-OC process, from an oxygen-containing, halogenide-containing or sulphur-containing organic feedstock comprising : a?) providing a first portion and a second portion of said oxygen-containing, halogenide-containing or sulphur-containing organic feedstock, a) providing a catalyst comprising zeolitic molecular sieves containing at least 10 membered ring pore openings or larger in their microporous structure, b) providing an XTO reaction zone, an OC reaction zone and a catalyst regeneration zone, said catalyst circulating in the three zones, such that at least a portion of the regenerated catalyst is passed to the OC reaction zone, at least a portion of the catalyst in the OC reaction zone is passed to the XTO reaction zone and at least a portion of the catalyst in the XTO reaction zone is passed to the regeneration zone; c) contacting the first portion of said oxygen-containing, halogenide- containing or sulphur-containing organic feedstock in the XTO reactor with the catalyst at conditions effective to convert at least a portion of the feedstock to form a XTO reactor effluent comprising light olefins and a heavy hydrocarbon fraction; d) separating said light olefins from said heavy hydrocarbon fraction; e) contacting said heavy hydrocarbon fraction and the second portion of said oxygen-containing, halogenide-containing or sulphur-containing organic feedstock in the OC reactor with the catalyst at conditions effective to convert at least a portion of said heavy hydrocarbon fraction and oxygen-containing, halogenide-containing or sulphur-containing organic feedstock to light olefins and aromatics.