Ionic Bronsted Acid Catalyst for Olefin Polymerization
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Solution Overview
Problem
Current hydroxyaluminoxane-based catalysts for olefin polymerization lack thermal stability and require costly low-temperature storage to maintain active proton concentration, limiting their commercial applicability due to rapid activity decrease at ambient temperatures.
Innovation Solution
Development of an ionic compound derived from N,N-dimethylaniline and pentafluorophenol, with at least two equivalents of pentafluorophenol per equivalent of N,N-dimethylaniline, which forms an ionic Bronsted acid with active protons, stabilizing the catalyst system and enhancing thermal robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydroxyaluminoxane-based catalysts are used for olefin polymerization, then high catalytic activity is achieved, but thermal stability deteriorates and low-temperature storage is required
Solution Approach 1:
The patent changes the chemical parameters of the activator by using ionic compounds with fluorinated phenolic groups instead of traditional hydroxyaluminoxanes. This parameter change increases thermal stability while maintaining catalytic activity, allowing storage at ambient temperatures without requiring low-temperature conditions.
Solution Approach 2:
The invention creates a composite ionic compound system combining quaternary ammonium or phosphonium cations with fluorinated phenoxide anions. This composite structure provides both the catalytic activity needed for polymerization and the thermal stability for ambient temperature storage, resolving the contradiction between activity and stability.
2Ease of operation
If hydroxyaluminoxane-based catalysts are stored at ambient temperature, then ease of operation improves, but catalytic activity deteriorates due to loss of active protons
Solution Approach 1:
The patent changes the chemical structure of the activator from hydroxyaluminoxane to ionic fluorinated phenol compounds. This structural parameter change eliminates the thermal instability of active protons, allowing the catalyst to maintain high activity during ambient temperature storage and operation without requiring refrigeration.
3Device complexity
If traditional aluminoxanes are used as activators, then simplicity of the system is maintained, but catalytic activity and thermal stability are insufficient for commercial applicability
Solution Approach 1:
The patent modifies the chemical parameters of the activator by introducing ionic fluorinated phenolic structures. This change simultaneously improves catalytic activity and thermal stability to commercial levels while maintaining relatively simple preparation procedures involving quaternization reactions, thus achieving a balance between simplicity and performance.
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 ionic compound provides a thermally robust and highly active catalyst system for olefin polymerization, maintaining activity at ambient temperatures and reducing storage costs by eliminating the need for low-temperature handling.
Implementation Method 1
hydroxyaluminoxane species (generally abbreviated HO—AO) comprise active protons, and appear to activate transition metals by functioning as Bronsted acids... capable of protonating a hydrocarbyl ligand from a d- or f-block organometallic compound to form a hydrocarbon
Implementation Method 2
The ionic compound provides a thermally robust and highly active catalyst system for olefin polymerization, maintaining activity at ambient temperatures and reducing storage costs by eliminating the need for low-temperature handling
Data Source
AI summary
A new ionic compound is provided that is derived from N,N-dimethylaniline and pentafluorophenol in amounts such that there are at least 2 equivalents of pentafluorophenol per equivalent of the N,N-dimethylaniline.