Polyhedral Silsesquioxane Catalysts for Oligomeric Isocyanate Synthesis
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Solution Overview
Problem
Existing catalysts for oligomeric polyisocyanate production are difficult to separate from reaction products in active form, leading to economic disadvantages due to catalyst inactivation and residual presence in the product, which affects further processing.
Innovation Solution
Development of polyhedral silsesquioxane compounds coupled with cyclic phosphorus compounds that can be easily extracted from reaction mixtures using solvents, allowing for the separation of active catalysts and reducing phosphorus content in the final polyisocyanate composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phosphorus-based catalysts are used for oligomerization, then catalytic activity is achieved, but separation from reaction product becomes difficult and catalyst remains in product mixture
Solution Approach 1:
The catalyst system is segmented into two distinct phases: a polar phase containing the phosphorus-based catalyst and a non-polar phase containing the reaction products. This phase separation enables easy separation of the catalyst from the product mixture while maintaining catalytic activity in the polar phase.
Solution Approach 2:
A polar solvent acts as an intermediary medium that dissolves the phosphorus-based catalyst, creating a distinct polar phase. This intermediary phase allows the catalyst to function effectively while enabling straightforward separation from the non-polar reaction products through phase separation techniques.
2Productivity
If catalyst is inactivated by oxidation to terminate reaction, then oligomerization stops, but inactivated catalyst remains in product and cannot be reused
Solution Approach 1:
The catalyst is extracted from the reaction mixture into a separate polar phase after the oligomerization reaction is complete. This extraction removes the catalyst from the product mixture, allowing for easy recovery and reuse of the catalyst while effectively terminating the reaction without requiring chemical inactivation.
Solution Approach 2:
Instead of discarding the catalyst after use, the system enables recovery of the phosphorus-based catalyst from the reaction mixture through phase separation. The recovered catalyst can then be reused in subsequent oligomerization reactions, reducing waste and operational costs.
3Productivity
If catalyst remains in product mixture in inactivated form, then reaction is terminated, but further processing of reaction product is adversely affected
Solution Approach 1:
The polar solvent serves as an intermediary that selectively solubilizes the catalyst, creating a separate polar phase that can be easily removed. This intermediary phase allows for clean separation of the catalyst from the non-polar reaction products, eliminating interference with further product processing while maintaining effective reaction termination.
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
Enables efficient oligomerization of isocyanates with high selectivity and catalyst recovery, resulting in a phosphorus-free or low-phosphorus polyisocyanate product with improved processing characteristics.
Implementation Method 1
These catalysts contain polyhedral silsesquioxanes to which cyclic phosphorus (III) or phosphorus (V) compounds are coupled... catalyze the oligomerization of isocyanates
Implementation Method 2
can be easily separated in active form from the reaction product... can be easily extracted from reaction mixtures using solvents
Data Source
AI summary
The present invention relates to novel catalysts for the production of oligomeric polyisocyanates. These catalysts contain polyhedral silsesquioxanes to which cyclic phosphorus(III) or phosphorus(V) compounds are coupled.