Ligand Compound, Organic Chromium Compound, and Catalyst Composition Including the Same
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Solution Overview
Problem
The production of linear low-density polyethylene (LLDPE) is hindered by high co-monomer costs and the need for separate separation processes due to the synthesis of alpha-olefins with varying lengths using the Shell Higher Olefin Process, which complicates the production of specific alpha-olefins like 1-hexene and 1-octene.
Innovation Solution
A novel ligand compound and organic chromium compound are used in a catalyst composition to selectively oligomerize ethylene, enhancing the production of 1-hexene and 1-octene with high selectivity and catalytic activity, reducing the need for separate separation processes and lowering co-monomer costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the Shell Higher Olefin Process is used to synthesize alpha-olefins, then various length alpha-olefins can be produced simultaneously, but a separate separation process is required to obtain specific alpha-olefin, which is cumbersome
Solution Approach 1:
The patent extracts and isolates the desired specific alpha-olefin (1-hexene or 1-octene) from the reaction mixture by controlling the oligomerization reaction conditions and using selective catalysts, thereby obtaining the target product without requiring complex separation processes for various length alpha-olefins
Solution Approach 2:
The patent changes the reaction parameters including temperature, pressure, and catalyst composition to achieve selective oligomerization of ethylene into specific alpha-olefin products (1-hexene or 1-octene), thereby eliminating the need for separation processes while maintaining production versatility
2Manufacturing precision
If co-polymerization is performed with co-monomer to control density in LLDPE production, then polymer density can be controlled, but the price of co-monomer accounts for a large portion of production cost
Solution Approach 1:
The patent produces co-monomers (1-hexene and 1-octene) directly from ethylene through oligomerization using inexpensive catalyst systems, replacing the need to purchase expensive commercial co-monomers while maintaining the ability to control polymer density through co-polymerization
Solution Approach 2:
The patent changes the source of co-monomers from external purchase to in-situ production by controlling ethylene oligomerization reaction parameters, thereby reducing co-monomer costs while maintaining polymer density control capability
3Manufacturing precision
If selective oligomerization of ethylene is performed to produce specific alpha-olefin, then high selectivity can be achieved, but catalytic activity must be sufficiently high for industrial application
Solution Approach 1:
The patent employs composite catalyst systems combining chromium compounds with specific ligand compounds (such as phosphine or carbene ligands) to achieve both high selectivity for 1-hexene and 1-octene and sufficient catalytic activity for industrial application, resolving the trade-off between precision and 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
The catalyst composition achieves high selectivity and productivity in producing linear alpha-olefins, such as 1-hexene and 1-octene, with reduced by-products like polyethylene wax, thereby optimizing the production process and lowering costs.
Implementation Method 1
a catalyst composition including the organic chromium compound... achieves high selectivity and productivity in producing linear alpha-olefins
Data Source
AI summary
Provided are a ligand compound having Formula 1, which exhibits high catalytic activity while exhibiting high 1-hexene and 1-octene selectivity, thereby allowing ethylene oligomerization to be achieved with excellent efficiency, an organic chromium compound, a catalyst composition including the organic chromium compound, and a method for oligomerizing ethylene by using the same;wherein all the variables are described herein.