Chromium Catalyst Ligand Design for 1-Hexene Selectivity
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Solution Overview
Problem
Existing ethylene oligomerization catalysts suffer from low selectivity to 1-hexene, resulting in the formation of undesired side products and by-products, which complicates the production process, reduces efficiency, and increases costs.
Innovation Solution
A chromium-based ethylene oligomerization catalyst comprising a specific ligand compound, represented by Chemical Formula 1, which enhances 1-hexene selectivity and maintains high catalytic activity even at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional chromium-based catalyst systems are used for ethylene oligomerization, then catalytic activity is achieved, but selectivity to 1-hexene is low and significant amounts of side products and by-products are formed
Solution Approach 1:
The patent modifies the ligand structure parameters by introducing specific substituents (R1-R6) with defined chemical groups and spatial arrangements. These parameter changes in the ligand compound structure enable the chromium catalyst to achieve high selectivity to 1-hexene by controlling the oligomerization reaction pathway, thereby reducing side products and by-products formation.
Solution Approach 2:
The patent creates a composite catalyst system comprising chromium compound combined with a specifically designed ligand compound featuring multiple functional groups and substituents. This composite structure integrates the chromium active center with the tailored ligand environment, resulting in enhanced selectivity to 1-hexene and reduced formation of unwanted by-products compared to conventional chromium catalysts.
2Ease of operation
If aliphatic hydrocarbon solvents are used for oligomerization reaction, then excellent solubility in organic metal catalyst is achieved, but separation becomes difficult due to similar boiling points
Solution Approach 1:
The patent changes the solvent parameter from aliphatic hydrocarbons to aromatic hydrocarbons (such as toluene, xylene, or mesitylene). This parameter change in solvent type maintains excellent solubility for the organometallic catalyst while providing a significant boiling point difference between solvent and 1-hexene product, thereby facilitating easier and more energy-efficient separation through distillation.
3Productivity
If polymer deposits in reactor components and pipelines, then continuous operation is disrupted, but shutdown and cleaning processes are required
Solution Approach 1:
The patent changes the reaction parameters by using aromatic hydrocarbon solvents and operating at optimized temperatures (50-150°C). These parameter changes result in improved product selectivity and reduced polymer formation, allowing continuous operation without frequent shutdowns for cleaning, thereby maintaining high productivity.
Solution Approach 2:
The patent converts the potential harmful effect of polymer deposition into a benefit by optimizing the catalyst system to produce highly selective 1-hexene with minimal polymer by-products. This eliminates the need for shutdowns and cleaning operations, turning what would be a process disruption into a continuous, efficient operation.
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 achieves significantly improved selectivity to 1-hexene, reducing the formation of side products and by-products, thereby increasing production efficiency and yield while maintaining economic feasibility.
Implementation Method 1
A chromium-based ethylene oligomerization catalyst comprising a specific ligand compound, represented by Chemical Formula 1, which enhances 1-hexene selectivity and maintains high catalytic activity even at elevated temperatures.
Data Source
AI summary
The present invention pertains to: an ethylene oligomerization catalyst containing a ligand compound; a catalyst composition employing same; and a method for producing an ethylene oligomer by using same. The catalyst exhibits excellent selectivity to oligomers and selectivity to 1-hexane, thus making it possible to mass-produce 1-hexane, which is an industrially useful chemical raw material, with high purity.