Carbodiimide Production via Inorganic Base and Phase Transfer Catalyst
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Solution Overview
Problem
The use of organic phosphorus compounds as carbodiimidization catalysts in producing carbodiimide compounds is expensive and results in interference with object materials, and existing methods to remove catalysts are complex.
Innovation Solution
Employing an inorganic alkali metal compound and a phase transfer catalyst to produce carbodiimide compounds without organic phosphorus, allowing for simple catalyst removal and high yield production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic phosphorus compounds are used as carbodiimidization catalysts, then the production of carbodiimide compounds can be achieved, but the cost increases and the catalyst interferes with object materials
Solution Approach 1:
The patent extracts and removes the harmful organic phosphorus catalyst from the reaction system by using an inorganic base catalyst instead, thereby eliminating the interference problem while maintaining catalytic functionality
Solution Approach 2:
The patent replaces expensive organic phosphorus compounds with inexpensive inorganic bases such as sodium hydroxide or potassium hydroxide, significantly reducing production costs while achieving the same catalytic effect
2Reliability
If organic phosphorus compounds are used as carbodiimidization catalysts, then the production of carbodiimide compounds can be achieved, but the production cost increases
Solution Approach 1:
The patent substitutes expensive organic phosphorus catalysts with cheap inorganic bases like sodium hydroxide or potassium hydroxide, dramatically lowering the production cost while maintaining effective catalysis
3Object-affected harmful factors
If catalyst distillation is performed under reduced pressure to remove organic phosphorus catalyst, then catalyst interference is reduced, but the process complexity increases
Solution Approach 1:
The patent eliminates the need for complex distillation processes by completely replacing organic phosphorus catalysts with inorganic bases that do not interfere with the product, thereby removing the harmful factor without adding process complexity
Solution Approach 2:
Instead of trying to remove the catalyst after reaction (distillation under reduced pressure), the patent inverts the approach by selecting a catalyst type (inorganic base) that inherently does not cause interference, making removal unnecessary
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
This method enables the production of carbodiimide compounds with high yield and purity, eliminating interference issues and simplifying the process by avoiding organic phosphorus compounds.
Implementation Method 1
reacting an aliphatic tertiary isocyanate compound (A) in the presence of an inorganic alkali metal compound (B) which has Lewis basicity and at least one of a phase transfer catalyst (C), a compound (D-1)
Implementation Method 2
reacting an aliphatic tertiary isocyanate compound (A) in the presence of an inorganic alkali metal compound (B) and at least one of a phase transfer catalyst (C)
Data Source
AI summary
A method for producing a carbodiimide compound, comprising a carbodiimide production step of reacting an aliphatic tertiary isocyanate compound (A) in the presence of an inorganic alkali metal compound (B) and at least one of a phase transfer catalyst (C), a compound (D-1) represented by general formula (2-1), and a compound (D-2) represented by general formula (2-2).