Ligand Compound for Olefin Oligomerization Selectivity
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Solution Overview
Problem
Existing methods for producing 1-hexene and 1-octene through ethylene oligomerization face challenges in achieving high selectivity and catalytic activity, particularly with chromium-based catalysts, which are costly due to high comonomer content in linear low-density polyethylene production.
Innovation Solution
A novel ligand compound with two or more diphosphinoamine functional groups linked by 4 carbon atoms, including a C1-20 aliphatic, C3-20 alicyclic, or C6-20 aromatic group, is used in a catalyst system for olefin oligomerization, enhancing catalytic activity and selectivity by controlling the electronic and steric environment around transition metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chromium-based catalysts are used for ethylene oligomerization, then 1-hexene and 1-octene can be produced, but the catalytic activity and selectivity are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by introducing ligands with specific electronic properties (electron-donating or electron-withdrawing groups) and steric characteristics (different alkyl, aryl, alicyclic groups). This modifies the electronic and steric environment around the chromium center, optimizing both catalytic activity and selectivity for producing 1-hexene and 1-octene
Solution Approach 2:
The patent creates a composite catalyst system combining chromium salts with specifically designed organic ligands containing heteroatoms (N, O, S, P, As, Sb). This composite structure integrates the metal center's catalytic capability with the ligand's electronic and steric properties, achieving enhanced activity and selectivity that neither component could provide alone
2Manufacturing precision
If comonomer content is increased in linear low-density polyethylene production, then density control is improved, but production cost increases
Solution Approach 1:
The patent develops a catalyst system that enables efficient oligomerization of ethylene to produce alpha-olefin comonomers (1-hexene, 1-octene) with high selectivity. This allows for the economical production of specific comonomers that can be precisely controlled in LLDPE synthesis, improving density control while managing costs through enhanced catalyst efficiency
Solution Approach 2:
By changing the catalyst parameters (ligand structure, electronic properties, steric environment), the patent enables selective production of specific comonomer types and quantities. This allows optimization of comonomer content in LLDPE to achieve desired density characteristics while controlling production costs through efficient catalysis
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 ligand compound significantly improves the catalytic activity and selectivity for 1-hexene and 1-octene production, reducing production costs and increasing efficiency in olefin oligomerization processes.
Implementation Method 1
a catalyst system for olefin oligomerization comprising the ligand compound, a source of transition metal and a cocatalyst
Data Source
AI summary
Provided are ligand compounds containing two or more diphosphinoamine functional groups, where the two or more diphosphinoamine functional groups are linked by 4 carbon atoms, a catalyst system including the ligand compounds for olefin oligomerization, and a method for olefin oligomerization using the same. The catalyst system for olefin oligomerization according to the present invention has excellent catalytic activity, and yet, exhibits high selectivity to 1-hexene and 1-octene, thus enabling efficient preparation of alpha-olefin.