Ethane Olefin Production via ZSM-5 Catalytic Conversion
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Solution Overview
Problem
Conventional processes for producing olefins with 3 or more carbon atoms from ethane through thermal cracking are inefficient and require complex purification steps, including multiple stages to remove impurities, making the process cumbersome and costly.
Innovation Solution
A process involving thermal cracking of ethane in the presence of steam, followed by catalytic conversion using a ZSM-5 zeolite catalyst without prior purification of the cracked gas, allowing for the direct conversion of ethylene to olefins with 3 or more carbon atoms, simplifying the production and stabilizing the catalyst performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional thermal cracking process is used to produce ethylene, then ethylene yield is high, but olefin with 3 or more carbon atoms is produced only in extremely small amount
Solution Approach 1:
The invention changes the reaction conditions by introducing a catalytic conversion step after thermal cracking. The cracked gas is contacted with a zeolite catalyst (ZSM-5, beta, Y, or mordenite) at controlled temperatures (400-600°C) to transform the product distribution, converting ethylene and other light hydrocarbons into olefins with 3 or more carbon atoms through catalytic oligomerization and cracking reactions.
Solution Approach 2:
The invention employs a composite process system combining thermal cracking and catalytic conversion. The catalyst system uses zeolite materials with specific pore structures and acid sites that work synergistically with the thermal cracking products to achieve selective transformation into desired olefin products.
2Reliability
If purification steps are added to remove impurities from cracked gas, then product quality improves, but process complexity increases
Solution Approach 1:
The invention converts the harmful effect of impurities (acetylene, water, high-boiling fractions) into a benefit by using them as part of the feedstock for the catalytic conversion process. The zeolite catalyst tolerates these impurities and actually uses them in the oligomerization and cracking reactions to produce the desired olefin products, eliminating the need for complex purification steps.
Solution Approach 2:
The catalytic conversion process is designed to be self-tolerant regarding impurities. The zeolite catalyst system automatically handles the conversion of various hydrocarbon components including those that would normally be considered impurities, transforming them into valuable olefin products without requiring external purification intervention.
3Quantity of substance
If compression step is added to produce propylene from ethylene, then propylene production is achieved, but process complexity increases
Solution Approach 1:
The invention segments the olefin production process into two distinct stages: thermal cracking to generate light hydrocarbons including ethylene, followed by catalytic conversion to transform these into heavier olefins including propylene. This segmentation allows each stage to be optimized independently, with the catalytic stage directly producing the desired propylene without requiring compression of ethylene and subsequent metathesis reactions.
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 enables the stable and simple production of olefins with 3 or more carbon atoms from ethane, reducing the complexity and cost of the process while maintaining high yields and catalyst efficiency.
Implementation Method 1
thermal cracking of ethane in the presence of steam
Implementation Method 2
catalytic conversion with a zeolite catalyst
Data Source
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AI summary
The present invention provides a process for producing olefin having 3 or more carbon atoms from ethane stably in a simpler process. The present invention provides a method for producing olefin having a step of obtaining a cold fraction by cooling an ethane-cracked gas, which is obtained by thermal cracking of ethane in the presence of steam, to 600°C or less; and a step of obtaining a catalytic cracking gas containing olefin having 3 or more carbon atoms by bringing the cold fraction into contact with a catalyst containing a medium pore diameter zeolite.