Titanocene Catalyst Composition for Steric-Hindered Olefin Hydrogenation
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Solution Overview
Problem
Current catalysts for hydrogenation, both heterogeneous and homogeneous systems, face challenges such as low activity, economic inefficiency, poor stability, and difficulty in separating and removing catalysts, especially when hydrogenating olefinic unsaturated double bonds with steric hindrance in polymers.
Innovation Solution
A catalyst composition comprising a titanocene compound, an organic metal compound, an unsaturated polymer, and a polar compound, with specific mass ratios, that effectively hydrogenates olefinic unsaturated double bonds with high activity and excellent storage stability, while allowing easy separation and producing non-colored hydrogenated products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If heterogeneous catalysts are used for hydrogenation, then the catalyst can be easily separated and removed, but the hydrogenation activity is low and large amounts of catalyst are required
Solution Approach 1:
The invention changes the physical state parameter of the catalyst from heterogeneous (solid) to homogeneous (soluble complex), enabling the catalyst to dissolve in the reaction medium and achieve high hydrogenation activity comparable to other homogeneous catalysts while maintaining ease of separation through subsequent removal processes
2Productivity
If homogeneous catalysts are used for hydrogenation, then the hydrogenation activity is high and catalyst can be used at low amounts, but the catalyst preparation is complex and storage stability is insufficient
Solution Approach 1:
The invention segments the catalyst into two separate components (titanocene compound and reducing agent) that can be stored independently and simply mixed before use, avoiding complex preparation procedures while maintaining high hydrogenation activity and improving storage stability
Solution Approach 2:
The invention introduces a reducing agent as an intermediary component that reacts with the titanocene compound to generate the active catalyst species in situ, simplifying the overall catalyst system and improving storage stability while maintaining high activity
3Productivity
If homogeneous catalysts are used for hydrogenation of polymers, then the hydrogenation activity is sufficient, but the catalyst cannot be completely separated and removed from the polymer
Solution Approach 1:
The invention employs a soluble complex catalyst system that can be easily removed after reaction, treating the catalyst as a temporary component that is discarded after serving its function, rather than attempting to recover or reuse it, thereby achieving complete catalyst removal from the polymer product
4Productivity
If conventional catalyst systems are used for hydrogenation of olefinic compounds with steric hindrance, then the reaction can proceed, but sufficient hydrogenation activity is not obtained
Solution Approach 1:
The invention changes the chemical structure parameters of the catalyst by using a titanocene compound with specific ligand structure and coordination geometry, creating an active species that can access and hydrogenate sterically hindered olefinic bonds effectively
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 hydrogenation activity, good feed properties, and excellent storage stability, effectively hydrogenating olefinic unsaturated double bonds with minimal coloration and easy catalyst removal.
Implementation Method 1
catalyst composition for hydrogenation comprising a titanocene compound, an organic metal compound, an unsaturated polymer, and a polar compound
Implementation Method 2
a compound containing one or more elements selected from the group consisting of elements Li, Na, K, Mg, Zn, Al, and Ca
Data Source
AI summary
A catalyst composition for hydrogenation including (A) to (D), in which a mass ratio ((C)/(A)) is 0.1 to 4.0 and a mass ratio ((D)/(A)) is 0.01 to 1.00,(A): a titanocene compound represented by formula (1),(wherein R5 and R6 are any group selected from hydrogen, a hydrocarbon group having 1 to 12 carbon atoms, an aryloxy group, an alkoxy group, a halogen group, and a carbonyl group. R1 and R2 are any group selected from the group consisting of hydrogen and a hydrocarbon group having 1 to 12 carbon atoms, and R1 and R2 are not all hydrogen atoms or all a hydrocarbon group having 1 to 12 carbon atoms),(B): a reductant formed from a compound containing an element selected from the elements Li, Na, K, Mg, Zn, Al, and Ca,(C): an unsaturated compound having a molecular weight of 400 or less, and(D): a polar compound.