Nickel-Phosphine-Lewis Base Catalyst for Ethylene Dimerization
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Solution Overview
Problem
Existing nickel-based catalytic systems for the dimerization of ethylene lack optimal yield and selectivity for producing 1-butene, with existing systems often not incorporating Lewis bases and achieving lower yields and selectivity compared to the desired outcomes.
Innovation Solution
A novel catalytic composition comprising a nickel precursor with an oxidation number of (+II), at least one phosphine ligand, and a Lewis base, with specific molar ratios of phosphine to nickel and Lewis base to nickel, which also includes an activating agent, enhancing the catalytic properties for the dimerization of ethylene to 1-butene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing nickel-based catalytic systems without Lewis bases are used, then the device complexity is reduced, but the butenes yield and 1-butene selectivity deteriorate
Solution Approach 1:
The patent combines multiple components (nickel compound, phosphine ligand, and Lewis base) into a single integrated catalytic system. The Lewis base (pyridine or trimethylamine) is merged with the existing nickel-phosphine system to create a synergistic catalyst that achieves 90% butenes yield and 59.7% 1-butene selectivity, resolving the contradiction between system complexity and productivity.
Solution Approach 2:
The invention creates a composite catalytic system by combining nickel compounds with specific phosphine ligands and Lewis bases in defined molar ratios. This composite approach, where each component contributes specific properties, enables the catalyst to achieve superior performance (90% yield) compared to simpler systems, effectively resolving the trade-off between complexity and productivity.
2Manufacturing precision
If existing nickel-based catalytic systems without Lewis bases are used, then the ease of manufacture is improved, but the 1-butene selectivity deteriorates
Solution Approach 1:
The patent optimizes specific parameters including the molar ratio of phosphine to nickel (0.5-5) and Lewis base to nickel (0.5-5), along with the ratio of phosphine to Lewis base (0.1-10). By precisely controlling these parameters, the system achieves 59.7% 1-butene selectivity. The defined parameter ranges balance manufacturing precision with ease of preparation, as these ratios can be systematically controlled during catalyst preparation.
3Productivity
If the phosphine to nickel molar ratio is increased beyond 5, then the catalytic activity may improve, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent establishes an optimal upper limit for the phosphine to nickel molar ratio at 5, beyond which no additional catalytic benefit is observed. This parameter optimization prevents unnecessary complexity and cost while maintaining maximum catalytic activity. The defined ratio range (0.5-5) provides a clear manufacturing guideline that balances performance with simplicity.
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 novel composition achieves a high yield and selectivity for 1-butene production, with butenes yields of at least 90% and selectivity for 1-butene of at least 59.7%, significantly improving upon existing systems.
Implementation Method 1
The transformation of ethylene using a homogeneous nickel catalyst has been studied since 1950. This research led to the development and commercialization of a variety of processes.
Data Source
AI summary
The invention concerns a catalytic composition comprising: at least one nickel precursor with an oxidation number of (+II), at least one phosphine ligand with formula PR1R2R3 in which the groups R1, R2 and R3, which may be identical or different and which may or may not be bonded together, and at least one Lewis base, said composition having a molar ratio of the phosphine ligand to the nickel precursor of less than or equal to 5 and a molar ratio of the Lewis base and phosphine ligand together to the nickel precursor of greater than or equal to 5.