N2-Phosphinylamidine Chromium Catalyst for Ethylene Oligomerization
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Solution Overview
Problem
Current catalyst systems for ethylene oligomerization lack efficiency and innovation, necessitating the development of novel catalysts to meet increasing demand for alpha olefins.
Innovation Solution
A catalyst system comprising an N2-phosphinylamidine chromium salt complex with a specific structure, used in conjunction with ethylene and an organic reaction medium, to facilitate the oligomerization process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalyst systems are used for ethylene oligomerization, then the process can proceed, but the efficiency and productivity are insufficient to meet increasing demand
Solution Approach 1:
The patent applies parameter changes by modifying the ligand structure around the chromium center, specifically using perfluorohydrocarbyl-N2-phosphinyl amidine ligands with fluorinated groups. This chemical parameter change enhances the catalyst's activity and selectivity, directly improving oligomerization efficiency and productivity to meet increasing demand for alpha olefins.
2Productivity
If existing chromium catalyst systems are employed, then ethylene oligomerization can occur, but selectivity and productivity remain limited
Solution Approach 1:
The patent applies local quality by introducing perfluorohydrocarbyl groups at specific positions on the ligand framework. These localized fluorinated modifications create electron-deficient regions that enhance the chromium center's electrophilicity and catalytic performance, thereby improving both productivity and reliability of the catalyst system.
3Manufacturing precision
If traditional catalyst systems are used, then the process is simpler, but manufacturing precision and selectivity for alpha olefins are inadequate
Solution Approach 1:
The patent applies segmentation by dividing the ligand into distinct functional segments: the perfluorohydrocarbyl groups provide electronic modulation, the N2-phosphinyl amidine framework provides structural support, and the chromium center provides catalytic activity. This segmented design allows each component to contribute specifically to alpha olefin selectivity while maintaining manageable complexity.
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 N2-phosphinylamidine chromium salt complex enhances the efficiency of ethylene oligomerization, producing higher yields of alpha olefins with improved selectivity and productivity.
Implementation Method 1
The disclosure relates to perfluorohydrocarbyl-N2-phosphinyl amidine compounds, chromium salt complexes, catalyst systems, and their use to oligomerize ethylene
Data Source
AI summary
A catalyst system comprising an N2-phosphinylamidine chromium salt complex having Structure PFHNPACr I:wherein Rf1, Rf2, Rf4, and Rf5 are independently selected from a perfluorohydrocarbyl group; and CrXp is a chromium salt; X is a monoanion, and p is an integer from 2 to 6. A process comprising a) contacting i) ethylene, ii) a catalyst system comprising an N2-phosphinylamidine chromium salt complex having Structure PFHNPACr I:wherein each Rf1, Rf2, Rf4, and Rf5 are independently selected from a perfluorohydrocarbyl group and CrXp is a chromium salt; X is a monoanion and p is an integer from 2 to 6, and iii) optionally an organic reaction medium; and b) forming an oligomer product in a reaction zone.