Imino Ferrous Catalyst for Ethylene Oligomerization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current ethylene oligomerization processes require an anhydrous and oxygen-free environment, making it difficult to achieve high oligomerization activity, stability, and repeatability due to the harmful effects of water.
Innovation Solution
A catalyst composition comprising an imino ferrous complex, an aluminum-containing cocatalyst, water, and an organic solvent, which enables high oligomerization activity even at a low aluminum to iron ratio and low temperature, overcoming the limitations of prior art by allowing water presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water is excluded from the reaction system to maintain anhydrous conditions, then the catalyst stability is improved, but the oligomerization activity and repeatability deteriorate
Solution Approach 1:
The patent changes the chemical parameter of the catalyst system by introducing a specific imino ferrous complex with a coordinated water molecule. This water molecule is not free water but is bound in the catalyst's coordination sphere, fundamentally altering the reaction mechanism to one where water is required for activity rather than harmful. This parameter change resolves the contradiction by making water a functional component rather than a contaminant.
Solution Approach 2:
The patent creates a composite catalyst system comprising the imino ferrous complex, aluminum-containing cocatalyst, and coordinated water molecule. This composite structure allows the water to play a constructive role in the catalytic cycle, simultaneously achieving high activity and stability that cannot be obtained with traditional anhydrous catalysts alone.
2Manufacturing precision
If anhydrous conditions are maintained to prevent water harm, then the reaction selectivity is improved, but the initiation speed and repeatability deteriorate
Solution Approach 1:
The patent converts the previously harmful effect of water into a beneficial one by incorporating it into the catalyst's coordination sphere. The water molecule that would normally inhibit the reaction now serves as an essential component for catalyst activation and maintains high selectivity while enabling rapid initiation and excellent repeatability.
3Productivity
If aluminum to iron ratio is increased to improve catalytic activity, then the oligomerization rate is improved, but the cost and complexity of the system worsen
Solution Approach 1:
The patent changes the fundamental parameter of the catalyst system by using an imino ferrous complex that activates water molecules. This allows the reaction to proceed at very low aluminum to iron ratios (e.g., 1:1 to 10:1), dramatically reducing the amount of expensive aluminum-containing cocatalyst needed while maintaining high oligomerization rates and simplifying the overall catalyst system.
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 oligomerization activity, rapid initiation, stable operation, and good repeatability, with high selectivity of α-olefins, and reduces the need for an anhydrous environment, making it suitable for industrial production.
Implementation Method 1
a catalyst composition for ethylene oligomerization, comprising an imino ferrous complex shown in Formula (I) as the main catalyst, an aluminum-containing cocatalyst, water, and an organic solvent
Data Source
AI summary
The present disclosure provides a catalyst composition for ethylene oligomerization including an imino ferrous complex shown in Formula (I) as the main catalyst, an aluminum-containing cocatalyst, water, and an organic solvent:According to the present disclosure, a higher oligomerization activity can be obtained with the catalyst composition than with a catalyst composition system in the prior art which contains no water. Moreover, when the catalyst composition according to the present disclosure is used, a high selectivity of α-olefins is obtainable. Besides, the catalyst composition according to the present disclosure can enable rapid initiation, stable operation, and good repeatability of the oligomerization reaction. According to the present disclosure, a high oligomerization activity can be obtained even at a rather low ratio of Al/Fe, or at a low reaction temperature.