Integrated Oxygenate Conversion and Olefin Cracking
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Solution Overview
Problem
Current methods for producing light olefins from oxygenates are costly and inefficient due to the limited availability and high cost of petroleum sources, and existing processes do not effectively increase the relative amount of light olefins produced.
Innovation Solution
A process involving an oxygenate conversion reactor with a catalyst to convert oxygenate-containing feedstocks into a product stream, which is then compressed and treated in a gas concentration system to recover light olefins, with subsequent cracking of C4 and C5 olefins to enhance light olefin production, utilizing a common compressor and gas concentration system to minimize costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate compressors and gas concentration systems are used for oxygenate conversion and olefin cracking processes, then process flexibility and independence are improved, but capital costs and system complexity increase
Solution Approach 1:
The patent combines the oxygenate conversion and olefin cracking processes into a single integrated reactor system where both catalysts operate simultaneously. The product stream from both reactions is combined and processed through a single compressor and gas concentration system, reducing the number of separate mechanical devices and control systems while maintaining process flexibility through catalyst zoning and independent feed streams.
Solution Approach 2:
The integrated reactor system performs multiple functions: it conducts both oxygenate conversion and olefin cracking reactions simultaneously, processes combined product streams through a single compression and separation train, and achieves both light olefin production and heavier olefin conversion in one unified system, thereby reducing overall system complexity.
2Productivity
If multiple separate processing units are used for oxygenate conversion and olefin cracking, then process control and optimization are improved, but capital costs and processing complexity increase
Solution Approach 1:
The patent merges the oxygenate conversion and olefin cracking operations into a single reactor with zoned catalyst beds, allowing both reactions to occur simultaneously. The combined product stream is then processed through a single compression and separation train, reducing the number of processing units while maintaining high light olefin yields through optimized catalyst placement and reaction conditions.
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 increases the yield of light olefins while reducing capital costs by using a single compressor and gas concentration system, improving the efficiency and economic viability of light olefin production.
Implementation Method 1
Molecular sieves such as microporous crystalline zeolite and non-zeolitic catalysts, particularly silicoaluminophosphates (SAPO), are known to promote the conversion of oxygenates to hydrocarbon mixtures
Implementation Method 2
A propylene and/or mixed butylene stream is fractionated from said light olefin stream and cracked to enhance the yield of ethylene and propylene products
Implementation Method 3
The oxygenate conversion product stream is compressed to a pressure sufficient to prevent condensation of C4+ hydrocarbons during cooling
Data Source
AI summary
An improved processing system of an oxygenate-containing feedstock for increased production or yield of light olefins. Such processing involves oxygenate conversion to olefins and subsequent cracking of heavier olefins wherein at least a portion of the products from each of the reactors is elevated in pressure, using a common compressor, prior to being routed to a common product fractionation and recovery section. The system further comprises acid gas removal means to remove acid gases from the cracked product gas and that the olefin cracking reactor is a moving bed reactor.