Ligand Compound for Olefin Oligomerization Selectivity
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Solution Overview
Problem
Existing methods for producing 1-hexene and 1-octene through ethylene oligomerization face challenges in achieving high selectivity and catalytic activity, leading to increased production costs due to high comonomer costs and varying market demands.
Innovation Solution
A novel ligand compound with a diphosphinoamine group structure, incorporating bulky alkyl and aryl groups, is used in a catalyst system comprising a transition metal source and cocatalyst to control the electronic and steric environment around the metal center, enhancing selectivity and catalytic activity for olefin oligomerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing ligand compounds are used for ethylene oligomerization, then catalytic activity can be maintained, but selectivity for specific olefins (1-hexene or 1-octene) is insufficient
Solution Approach 1:
The patent introduces ligands with specific local structural features - bulky substituents at ortho positions of phenyl rings and heteroatom-containing groups at meta positions. These localized structural modifications create specific electronic and steric environments at the metal center, enabling both high selectivity for 1-hexene/1-octene and maintained catalytic activity
Solution Approach 2:
The patent systematically varies ligand parameters including substituent types (alkyl, aryl, heteroatom-containing groups), substituent positions (ortho, meta), and steric bulk. These parameter changes in ligand structure directly influence the electronic and steric properties of the catalyst, achieving optimal balance between selectivity and activity
2Stability of the object's composition
If comonomer content in LLDPE is increased to control density, then polymer properties are improved, but production cost increases due to high comonomer cost
Solution Approach 1:
The patent enables selective production of specific alpha-olefin comonomers (1-hexene or 1-octene) through selective ethylene oligomerization using the developed catalyst system. This self-service approach allows producers to manufacture their own comonomers with high selectivity, reducing dependency on external suppliers and lowering overall production costs
3Adaptability or versatility
If selective ethylene oligomerization is used to produce specific alpha-olefins, then market demand alignment is improved, but production cost increases due to complex catalyst requirements
Solution Approach 1:
The patent develops a universal chromium catalyst system that can selectively produce different alpha-olefins (1-hexene or 1-octene) by simply changing the ligand structure. This multi-functional catalyst system eliminates the need for multiple specialized catalysts, reducing overall system complexity while maintaining versatility
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 catalyst system achieves higher catalytic activity and selectivity for 1-hexene and 1-octene production, reducing by-product formation and improving the efficiency of olefin oligomerization compared to existing systems.
Implementation Method 1
a catalyst system for olefin oligomerization, comprising the ligand compound; a source of transition metal; and a cocatalyst
Data Source
AI summary
This disclosure relates to a ligand compound, a catalyst system for olefin oligomerization, and a method for olefin oligomerization using the same. The catalyst system for olefin oligomerization according to the present invention has excellent catalytic activity, and yet, exhibits high selectivity to 1-hexene or 1-octene, thus enabling more efficient preparation of alpha-olefin.