Titanium Homogeneous Catalyst for Diene Polymer Hydrogenation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hydrogenation catalysts for polymers and copolymers of conjugated dienes face challenges such as low stability, high catalyst consumption, difficulty in separating catalyst residues, and incomplete double bond saturation, leading to reduced ageing resistance and polymer oxidation.
Innovation Solution
Development of a homogeneous titanium catalyst with the formula (R1Cp)(R2Cp)Ti(PhOR3)2, which is highly soluble in organic solvents, active without reducing agents, and has decomposition products that are easily separable, allowing for efficient hydrogenation of double bonds under mild conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heterogeneous catalysts are used for hydrogenation of conjugated diene polymers, then the catalyst is stable and easy to separate, but the catalyst requires large quantities and severe reaction conditions leading to polymer decomposition
Solution Approach 1:
The patent changes the chemical parameters of the catalyst by using titanium compounds with specific organic ligands (cyclopentadienyl groups and phenyl alkoxyl groups) to create a homogeneous catalyst system that operates under mild conditions with high activity, resolving the contradiction between stability and productivity
2Productivity
If homogeneous catalysts are used for hydrogenation of conjugated diene polymers, then the catalyst is active and requires small quantities under medium conditions, but the catalyst is unstable and difficult to separate from products
Solution Approach 1:
The patent modifies the homogeneous catalyst system by selecting specific titanium compounds with organic ligands that provide both high catalytic activity and stability, while the decomposition products have high boiling points enabling easy separation by distillation
Solution Approach 2:
The patent enables easy separation and recovery of the catalyst from the hydrogenated polymer product through distillation of decomposition products with high boiling points, allowing the catalyst to be discarded or recovered without contaminating the product
3Ease of manufacture
If heterogeneous catalysts are used, then the catalyst can be separated from products, but complete elimination is impossible due to high adsorption of polymer onto catalyst surface
Solution Approach 1:
The patent changes the separation method from physical adsorption-based separation to thermal separation through distillation, where the catalyst decomposition products have sufficiently high boiling points to be completely separated from the hydrogenated polymer, achieving both ease of separation and high product purity
4Manufacturing precision
If Ziegler-type homogeneous catalysts are used, then selective hydrogenation of polydiene units is achieved, but catalyst residues have negative impact on hydrogenated polymer stability and are difficult to eliminate
Solution Approach 1:
The patent changes the catalyst system to titanium compounds with specific ligands that provide high selectivity for polydiene hydrogenation while producing decomposition products with high boiling points that can be easily removed, eliminating the stability issue associated with catalyst residues
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 new catalysts provide a more economical, stable, and efficient process with improved polymer quality, reduced impurities, and increased productivity, enabling higher yields of hydrogenated polymers with enhanced ageing resistance and color stability.
Implementation Method 1
homogeneous hydrogenation catalyst based on titanium compounds... for the hydrogenation of double bonds in unsaturated compounds
Implementation Method 2
the decomposition products whereof are easy to eliminate... separation of the catalyst or the decomposition products thereof from the hydrogenated products
Data Source
AI summary
Homogeneous catalyst based on titanium compounds of the type (R1Cp)(R2Cp)Ti(PhOR3)2, where Cp is a cyclopentadienyl group, R1 and R2 are identical or different alkyl radicals (C3-C10), Ph is a phenyl group and OR3 is an alkoxyl group. Moreover, the invention relates to the use of said catalyst in a method for the hydrogenation of double bonds in unsaturated compounds, preferably polymers and/or copolymers of conjugated dienes, under mild reaction conditions.