Synergistic Dual Catalyst System for Olefin Polymerization
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Solution Overview
Problem
Dual catalyst systems for olefin polymerization often produce polymer mixtures rather than single polymers due to independent catalyst actions, leading to variable activities and inefficiencies.
Innovation Solution
A synergistic dual catalyst system comprising two or more solid-supported metal complexes, where one complex oligomerizes ethene to α-olefins and the other polymerizes ethene, allowing in situ formed oligomers to be incorporated into the growing polymer chain, using a single ethylene feed, with tunable ratios to achieve different polyethylene products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual catalyst systems are used for olefin polymerization, then productivity is improved, but the catalysts catalyze reactions independently producing polymer mixtures rather than single polymers
Solution Approach 1:
The patent introduces an organometallic compound as an intermediary that mediates between the two catalyst systems. This intermediary enables cooperative interaction between the catalysts, allowing them to work synergistically rather than independently, thus producing a single polymer with controlled composition while maintaining high productivity
Solution Approach 2:
The patent modifies the chemical parameters of the catalyst system by introducing the organometallic compound with specific ligands and stoichiometric ratios. This parameter change transforms the independent catalytic actions into cooperative synergistic actions, resolving the contradiction between productivity and composition uniformity
2Productivity
If dual catalyst systems are used for olefin polymerization, then polymerization activity is enhanced, but variable activities result from independent catalyst actions
Solution Approach 1:
The organometallic compound serves as a mediator that standardizes the interaction between the two catalyst systems. This intermediary ensures consistent cooperative behavior, making the catalyst activity reliable and reproducible while maintaining high productivity
Solution Approach 2:
By introducing the organometallic compound with controlled stoichiometry and specific chemical properties, the patent stabilizes the catalytic system's parameters, ensuring consistent activity across different runs while maintaining enhanced productivity
3Adaptability or versatility
If separate catalyst systems are used for oligomerization and polymerization, then different polymer structures can be achieved, but the process complexity increases
Solution Approach 1:
The patent merges the oligomerization and polymerization catalyst systems into a single dual-catalyst system that operates cooperatively. This combination allows different polymer structures to be achieved within one system without increasing process complexity, as the organometallic intermediary coordinates the interactions between the two catalysts
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 dual catalyst system enables the production of a single copolymer of ethylene/α-olefins with improved polymerization productivity and controlled polymer structure, surpassing the limitations of separate catalyst systems by promoting cooperative action.
Implementation Method 1
at least a first transition metal complex oligomerizes ethene to one or more α-olefins
Implementation Method 2
at least a second transition metal complex polymerizes ethene
Implementation Method 3
supported on a solid support material
Data Source
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AI summary
The present invention relates to a synergistic dual olefin copolymerisation catalyst system comprising a solid support material having, on its surface, two or more catalytic metal complexes wherein the two or more catalytic metal complexes comprise at least one first transition metal complex and a second transition metal complex different from the first transition metal complex; use of such a system as a catalyst; a process for producing a polymer of an olefin utilizing the catalyst system.