N2-Phosphinyl Guanidine Chromium Catalyst for Olefin Oligomerization
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Solution Overview
Problem
Current catalyst systems for olefin oligomerization and polymerization, particularly those using chromium catalysts, face limitations in efficiency and selectivity, leading to a need for novel and improved catalysts to enhance the production of alpha-olefins and other olefin derivatives.
Innovation Solution
The development of N2-phosphinyl guanidine metal salt complexes, specifically those comprising a chromium salt complexed with an N2-phosphinyl guanidine compound, in conjunction with a metal alkyl compound like aluminoxane, forms a catalyst system that is aged in the absence of olefin to improve oligomerization processes, particularly for ethylene to produce high yields of C6 and C8 olefins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional chromium catalyst systems are used for olefin oligomerization, then the basic catalytic function is maintained, but the efficiency and selectivity are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the ligand structure from conventional PNP pincer ligands to N2-phosphinyl guanidine ligands with specific structural parameters (R1, R2a, R3, R4, R5 substituents). This changes the electronic and steric parameters of the chromium complex, resulting in improved oligomerization efficiency and selectivity for C6 and C8 olefins while maintaining catalyst stability
Solution Approach 2:
The invention creates a composite catalyst system combining chromium salt, N2-phosphinyl guanidine ligand, and aluminoxane co-catalyst. This composite structure integrates the advantages of each component: chromium provides catalytic activity, the N2-phosphinyl guanidine ligand provides structural stability and electronic tuning, and aluminoxane enhances the overall catalytic performance and selectivity
2Manufacturing precision
If chromium PNP catalysts are used for oligomerization reactions, then catalytic activity is achieved, but selectivity for C6 and C8 olefins is limited
Solution Approach 1:
The patent applies local quality by introducing specific substituent groups (R1, R2a, R3, R4, R5) at different positions of the N2-phosphinyl guanidine ligand. These localized structural modifications create specific steric and electronic environments around the chromium center, which control the selectivity for C6 and C8 olefin production while maintaining high catalytic activity
Solution Approach 2:
By changing the ligand parameters from conventional PNP to N2-phosphinyl guanidine structure with可调 substituents, the patent optimizes the electronic density and steric hindrance parameters at the active site, achieving both high selectivity for desired oligomers and maintained catalytic productivity
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 catalyst system significantly enhances the production of C6 and C8 olefins, achieving high weight percentages of 1-hexene and 1-octene, thereby improving the efficiency and selectivity of olefin oligomerization processes.
Implementation Method 1
chromium salt complexed with an N2-phosphinyl guanidine compound, in conjunction with a metal alkyl compound like aluminoxane, forms a catalyst system that is aged in the absence of olefin to improve oligomerization processes
Data Source
AI summary
The present application relates to N2-phosphinyl guanidine meial salt complexes. The present application also relates to catalyst systems comprising N2-phosphinyl guanidine metal salt complexes and processes for making catalyst systems comprising N2~phosphinyi guanidine metal salt complexes. The present application also relates to utilizing N'-phosphinyl guanidine metal salt complexes in processes of oligomerizing or polymerizing olefins.