Solid-Supported Chromium Catalyst for Olefin Oligomerization
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Solution Overview
Problem
Existing catalyst systems for olefin oligomerization require large amounts of cocatalysts and result in high production costs and fouling issues due to the formation of solid polyethylene by-products, which complicates the separation of catalysts from liquid-phase reactants and products.
Innovation Solution
A catalyst system where diphosphine groups form coordinate bonds with chromium, supported on a solid phase, using a molar ratio of chromium to ligand compound of 1 or more, and a cocatalyst such as trimethyl aluminium, allowing for high activity and selectivity in olefin oligomerization reactions, even with reduced cocatalyst amounts, and facilitating easy separation of catalysts from products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid-phase catalyst systems are used for olefin oligomerization, then catalytic activity can be achieved, but large amounts of cocatalyst are required and production costs increase
Solution Approach 1:
The patent changes the physical state parameter of the catalyst system from liquid-phase to solid-phase by supporting the chromium complex on a solid carrier. This phase change enables the catalyst to maintain high activity while requiring significantly reduced amounts of cocatalyst, as the solid-supported system prevents catalyst degradation and allows for more efficient utilization of the catalytic active sites.
Solution Approach 2:
The patent creates a composite catalyst system by combining the chromium complex with organic ligands supported on a solid carrier material. This composite structure integrates the catalytic functionality with the structural stability of the support, enabling high productivity with reduced cocatalyst requirements through synergistic effects between the components.
2Productivity
If liquid-phase catalyst systems are used, then olefin oligomerization can proceed, but solid polyethylene by-products form causing fouling
Solution Approach 1:
The patent changes the phase state of the catalyst system from liquid to solid, which fundamentally alters the reaction environment. The solid-supported catalyst system prevents the formation of solid polyethylene by-products through controlled catalysis, thereby eliminating fouling while maintaining high reaction efficiency for olefin oligomerization.
3Productivity
If liquid-phase catalyst systems are used, then catalysis can be performed, but separation of catalyst from liquid-phase products becomes complex
Solution Approach 1:
The patent changes the physical state of the catalyst from liquid-dissolved to solid-supported form. This phase transition enables simple separation of the catalyst from liquid-phase products through filtration or centrifugation, while the catalyst maintains its catalytic function. The solid carrier provides a stable platform that facilitates easy product-catalyst separation without compromising catalytic activity.
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 catalyst system exhibits high activity and selectivity for linear alpha-olefins, reduces by-product formation, and prevents fouling by maintaining catalysts in a solid phase, enhancing the efficiency and cost-effectiveness of olefin oligomerization reactions.
Implementation Method 1
a ligand compound, which has a structure including at least one nitrogen atom and at least one diphosphine group, and a chromium source, to form a catalyst system
Implementation Method 2
catalyst system for olefin oligomerization reaction... high activity and selectivity for linear alpha-olefin in olefin oligomerization reaction
Data Source
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AI summary
Provided are a catalyst system for olefin oligomerization reaction and a method for olefin oligomerization, and more particularly, a catalyst system for olefin oligomerization reaction and a method for olefin oligomerization, which enable more efficient preparation of alpha-olefin, because a catalytic active ingredient is supported on a support, thereby exhibiting high activity in olefin oligomerization reaction even by using smaller amounts of a catalyst composition and a cocatalyst.