Olefin Oligomerization Catalyst with Activity Modifier
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Solution Overview
Problem
Existing catalyst systems for olefin oligomerization face challenges in maintaining stable process operation due to rapid initial reaction rate increases, which affects selectivity and catalytic activity, particularly for linear alpha-olefins like 1-hexene and 1-octene.
Innovation Solution
A catalyst system is developed comprising a ligand with a diphosphino aminyl moiety, a chromium source, and a cocatalyst, treated with an activity modifier to control initial catalytic activity, allowing for high selectivity and stable process operation by delaying the increase in catalytic activity and restoring it over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalyst systems are used for olefin oligomerization, then high catalytic activity is achieved, but rapid increase in reaction rate occurs making stable process operation difficult
Solution Approach 1:
The patent applies preliminary action by pre-treating the catalyst system with an activity modifier before the oligomerization reaction begins. This modifier temporarily reduces the catalyst's activity, preventing the rapid initial reaction rate increase. The modifier is added in a controlled manner prior to reactant introduction, allowing the catalyst to be 'primed' at a lower activity level that enables stable process operation while maintaining high selectivity.
2Productivity
If catalyst activity is increased to improve productivity, then reaction rate increases, but selectivity to linear alpha-olefins decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the catalyst system's activity parameters through the introduction of an activity modifier. This modifier changes the operational parameters of the catalyst, allowing the reaction to proceed at controlled rates that favor linear alpha-olefin formation. The parameter adjustment enables the system to maintain high selectivity while achieving acceptable productivity through controlled reaction progression.
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 method achieves high selectivity to 1-hexene or 1-octene with excellent catalytic activity and stable process operation, as demonstrated by controlled activity and selectivity throughout the reaction.
Implementation Method 1
contacting olefinic monomers with the catalyst system
Data Source
Figure 1
AI summary
The present disclosure relates to a method for oligomerization of olefins. The method for oligomerization of olefins according to the present disclosure not only provides excellent catalytic activity and stable process operation, but also exhibits high selectivity to 1-hexene or 1-octene by using a catalyst system including an activity modifier.