Phosphorus-Treated Zeolite Catalyst for Olefin Conversion
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Solution Overview
Problem
Current methanol-to-olefin processes produce undesirable by-products that are rich in olefins, making them unsuitable for further conversion to commercially valuable ethylene and propylene, and existing methods for producing these olefins are inefficient and costly due to catalyst coking, purification challenges, and uncertain yields.
Innovation Solution
Contacting a mixture of C4+ compounds, rich in olefins, with a phosphorus-treated zeolite catalyst to convert them into ethylene and propylene, with multiple contact steps and separation to optimize conversion rates, and recycling reactor effluent to enhance production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If C4+ streams from methanol-to-olefin processes are used as feedstock, then olefin content is high (at least 80 weight %), but the streams are unsuitable for further conversion due to high olefin content and presence of oxygenates and dienes/acetylenes
Solution Approach 1:
The patent converts the harmful high olefin content and impurities (oxygenates, dienes/acetylenes) in C4+ streams into beneficial products (ethylene, propylene) through catalytic cracking. The phosphorus-treated zeolite catalyst specifically transforms these previously undesirable components into valuable light olefins, turning the feedstock's limitations into production advantages.
Solution Approach 2:
The patent changes the chemical parameters of the C4+ stream by using phosphorus-treated zeolite catalyst under controlled cracking conditions (temperature, pressure, contact time). This transformation converts the original composition (high C4+ olefins with impurities) into a different composition (ethylene, propylene, and other light olefins), making the material suitable for its intended purpose.
2Productivity
If existing methods (steam cracking, propane dehydrogenation, catalytic cracking) are used to produce ethylene and propylene, then production is achieved, but the processes suffer from catalyst coking, frequent regenerations, sub-atmospheric pressure requirements, and purification challenges
Solution Approach 1:
The patent applies local quality by using phosphorus-treated zeolite catalyst with specific properties (acid site distribution, pore structure) that are optimized for cracking C4+ olefins. This localized catalytic action occurs within the catalyst's porous structure, providing high activity and selectivity while resisting coking compared to conventional catalysts.
Solution Approach 2:
The patent uses composite material approach by combining phosphorus treatment with zeolite base material to create a catalyst with enhanced properties. The phosphorus modification creates a composite catalyst system that exhibits improved resistance to coking and better selectivity for ethylene and propylene production compared to unmodified zeolite or conventional catalysts.
3Manufacturing precision
If C4+ streams are separated into fractions before processing, then purification is achieved, but the cost increases and waste generation increases
Solution Approach 1:
The patent applies segmentation by separating the cracking process into multiple stages or zones within the reactor system, allowing different portions of the C4+ stream to undergo controlled conversion. This staged approach enables efficient conversion while minimizing the need for extensive pre-separation and reducing waste from discarded fractions.
Solution Approach 2:
The patent makes the phosphorus-treated zeolite catalyst universal by demonstrating its ability to process the entire C4+ stream (C4, C5, C6+ olefins along with oxygenates and dienes/acetylenes) in a single reaction system. This multi-functional catalyst eliminates the need for multiple separate purification and processing steps, reducing both cost and waste.
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 efficiently converts C4+ compounds into ethylene and propylene with improved yield ratios and reduced costs by using a phosphorus-treated zeolite catalyst, overcoming the limitations of existing processes.
Implementation Method 1
contacting the first mixture of C4+ compounds with a catalyst comprising a phosphorus treated zeolite to convert at least a portion of the mixture of C4+ compounds to at least one of ethylene and propylene
Data Source
AI summary
Methods of producing propylene and/or ethylene. The methods can include contacting a mixture of C4+ compounds with a catalyst, such as a fixed bed catalyst, that includes a phosphorus treated zeolite. The mixture of C4+ compounds can include a plurality of C4 olefins, a plurality of C5 olefins, and/or a plurality of C6+ olefins.