Preformed Rare-Earth Metallocene Catalyst for Storage Stability
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Solution Overview
Problem
Catalytic systems based on rare earth metallocenes experience a decrease in catalytic activity during storage, requiring adjustments in polymerization process parameters and stability phases, which reduces productivity and complexity in polymer production.
Innovation Solution
A preformed catalytic system comprising a metallocene and a co-catalyst, specifically designed with a preformation monomer of ethylene or a mixture of ethylene and a conjugated diene, which maintains stable catalytic activity over time, eliminating the need for frequent process adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rare-earth metallocene-based catalytic system is used for polymerization, then the polymer specifications can be achieved, but the catalytic activity decreases during storage requiring process adjustments
Solution Approach 1:
The patent applies preliminary action by pre-forming the catalytic system with a specific ligand structure before use. The ligand is designed in advance to maintain stable coordination with the rare-earth metallocene during storage, preventing catalyst deactivation. This pre-designed stable configuration ensures the catalyst remains active without requiring storage adjustments, while still achieving the required polymer specifications upon use.
2Manufacturing precision
If process adjustments are made to compensate for catalytic activity fluctuations, then polymer specifications are maintained, but productivity decreases due to adjustment and stabilization phases
Solution Approach 1:
The catalytic system is pre-designed with a stable ligand structure that maintains constant activity during storage, eliminating the need for adjustment and stabilization phases before production. This preliminary stabilization of the catalyst system allows immediate productive operation while maintaining polymer specifications.
3Manufacturing precision
If process adjustments are performed to stabilize catalytic activity, then consistent polymer quality is achieved, but operational complexity increases
Solution Approach 1:
The ligand structure is pre-configured to provide inherent stability to the catalytic system during storage. This preliminary design eliminates the operational complexity of monitoring and adjusting catalytic activity, as the system maintains consistent performance automatically without requiring operational interventions.
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 preformed catalytic system ensures consistent catalytic activity during storage, allowing for continuous production without the need for process readjustments, thereby improving productivity and simplifying operations while maintaining polymer specifications.
Implementation Method 1
The invention relates to a preformed catalytic system based on rare-earth metallocenes... comprising a metallocene and a co-catalyst
Data Source
AI summary
The present invention relates to a catalytic system made of at least one preforming monomer which is ethylene or a mixture of ethylene and a conjugated diene, a metallocene of formula{P(Cp1)(Cp2)Y} or Cp3Cp4Y, an organometallic compound as a co-catalyst, Y designating a group comprising a rare-earth metal atom, the groups Cp1, Cp2, Cp3 and Cp4, identical or different, being selected from the group made up of the fluorenyl groups, the cyclopentadienyl groups and the indenyl groups, the groups being optionally substituted, P being a group bridging the two groups Cp1 and Cp2, and comprising a silicon or carbon atom. Such a catalytic system has improved stability of the catalytic activity over time, in particular during storage.