Half-Metallocene Titanium Catalyst for Selective 1-Hexene Production
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Solution Overview
Problem
Current catalyst systems for ethylene trimerization and ethylenic polymer production are inefficient and economically unsound, particularly at high temperatures, as they produce mixtures of α-olefins and result in low selectivity for 1-hexene and high melting point polymers.
Innovation Solution
A transition metal complex represented by a specific general formula, which acts as a catalytic component for ethylene trimerization and olefin polymerization, is used in conjunction with an activating co-catalytic component to selectively produce 1-hexene and ethylenic polymers with butyl branches, even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional catalyst systems are used for ethylene trimerization, then α-olefin mixtures are produced according to Shultz-Flory distribution, but selectivity for 1-hexene is low
Solution Approach 1:
The patent applies parameter changes by modifying the catalyst system parameters - specifically using a half-metallocene titanium complex with a substituted aryl group bonded via carbon atom instead of conventional catalysts. This chemical parameter change transforms the product distribution from Shultz-Flory mixture to selective 1-hexene trimerization, achieving high selectivity for the desired α-olefin
Solution Approach 2:
The patent applies local quality by creating a specific catalytic site structure where the titanium center is coordinated with a half-metallocene ligand featuring a substituted aryl group. This localized structural modification at the catalyst active site enables selective binding and transformation of ethylene molecules into 1-hexene, while other catalyst systems produce mixed α-olefins
2Productivity
If temperature is increased to 80° C. for catalytic reaction, then reaction rate increases, but catalytic activity and 1-hexene production selectivity decrease
Solution Approach 1:
The patent applies parameter changes by optimizing the catalyst structure to be thermally stable. The half-metallocene titanium complex with substituted aryl group maintains its catalytic configuration at elevated temperatures, preventing the loss of selectivity that normally occurs when temperature increases to 80° C. or higher
3Device complexity
If conventional half-metallocene titanium complex with cyclopentadiene bonded to phenyl group via silicon atom is used, then catalyst structure is simple, but catalytic activity is low and polyethylene by-product is produced in large amount
Solution Approach 1:
The patent applies local quality by modifying the bonding structure at the cyclopentadiene-aryl interface. Instead of bonding via silicon atom, the invention uses direct carbon atom bonding between cyclopentadiene and substituted aryl group. This localized structural change at the ligand-metal interface significantly enhances catalytic activity while maintaining structural simplicity and reducing polyethylene by-product formation
Solution Approach 2:
The patent applies asymmetry by using a half-metallocene structure where the cyclopentadiene ring is bonded to a substituted aryl group through a carbon atom, creating an asymmetric ligand field around the titanium center. This asymmetric configuration optimizes the electronic and steric environment for ethylene trimerization, enhancing catalytic activity compared to symmetric or silicon-bonded structures
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 transition metal complex enables efficient and selective production of 1-hexene and ethylenic polymers with desired branch structures, improving catalytic activity and reducing the need for expensive α-olefin monomers, thus enhancing the economic viability of the process.
Implementation Method 1
a transition metal complex represented by a specific general formula, which acts as a catalytic component for ethylene trimerization and olefin polymerization
Implementation Method 2
acts as a catalytic component for ethylene trimerization and olefin polymerization, is used in conjunction with an activating co-catalytic component
Data Source
AI summary
Disclosed is transition metal complex that serves as a catalytic component with which 1-hexene can be produced efficiently with excellent selectivity, even under high temperature conditions, by means of an ethylene trimerization reaction. Said transition metal complex is represented by the following general formula (1), wherein M1 represents a Group 4 transition metal atom, and R1 through R11 and X1 through X3 each independently represent a hydrogen atom, a halogen atom, or a specific organic group.