Olefin Oligomerization Catalyst Ligand Design
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Solution Overview
Problem
Current processes for producing olefin oligomers, such as 1-hexene and 1-octene, face challenges in achieving high reaction activity and selectivity while maintaining economic efficiency, leading to increased production costs.
Innovation Solution
A process involving a composite catalyst with a transition metal compound, a cocatalyst, and an organic ligand containing a diphosphonoamine compound combined via a polyvalent functional group, used in conjunction with a halogenated organic solvent like chlorobenzene or dichlorobenzene, to enhance catalyst activity and selectivity during olefin oligomerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional processes (SHOP process, Ziegler Process) are used to produce alpha-olefins, then production can be achieved, but production costs increase and reaction activity/selectivity are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by introducing a specific organic ligand with phosphorus, arsenic, or antimony atoms combined with nitrogen-containing groups, and optimizing the metal-to-ligand ratio to 1:0.1-1:0.5. This parameter optimization significantly improves reaction activity and selectivity while reducing production costs compared to conventional SHOP and Ziegler processes
Solution Approach 2:
The patent creates a composite catalyst system combining transition metal compounds (chromium, cobalt, nickel, or iron) with specially designed organic ligands containing both phosphorus/arsenic/antimony and nitrogen atoms. This composite structure enhances catalyst performance, achieving high reaction activity and selectivity for producing 1-hexene and 1-octene while being more economical than conventional processes
2Manufacturing precision
If comonomer content in LLDPE is increased to control density, then polymer performance improves, but production costs increase
Solution Approach 1:
The patent enables the catalyst system to self-optimze the comonomer incorporation efficiency through its enhanced selectivity. The composite catalyst automatically achieves high comonomer content (improving density control) in the polymer without requiring additional expensive process modifications, as the catalyst itself provides the necessary selectivity and activity
3Productivity
If existing catalysts are used for ethylene oligomerization, then olefin production is achieved, but selectivity and long-term activity are insufficient
Solution Approach 1:
The patent introduces specific local chemical characteristics into the ligand structure by incorporating phosphorus, arsenic, or antimony atoms at particular positions within the organic framework, along with nitrogen-containing groups. This localized structural optimization enhances the catalyst's ability to selectively produce desired olefin oligomers (1-hexene and 1-octene) while maintaining high long-term activity
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 process improves the efficiency and selectivity of olefin oligomer production, reducing by-product formation and lowering production costs by optimizing catalyst performance.
Implementation Method 1
a catalyst for ethylene oligomerization which includes an organic ligand compound containing a transition metal such as chromium, etc., any one element of phosphorus, arsenic, and antimony, and nitrogen
Data Source
AI summary
The present invention relates to a process for preparing an olefin oligomer including a step of contacting an olefin monomer with a composite catalyst in the presence of a halogenated organic solvent, wherein the composite catalyst includes: a transition metal compound; a cocatalyst; and an organic ligand including a diphosphonoamine compound in which two or more diphosphonoamines are combined via a polyvalent functional group.