Metal Carbonyl Catalysts for Carbodiimide Synthesis
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Solution Overview
Problem
Existing processes for preparing carbodiimides are inefficient in terms of resource and process efficiency, and they often use toxic catalytic compounds.
Innovation Solution
A process using a catalytic compound comprising a metal M (such as Mo or W) bound to oxygen via single, double, or both single and double bonds, which is less toxic and more cost-efficient, to prepare carbodiimides at lower temperatures with high yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phospholene oxide-containing catalysts are used for carbodiimide synthesis, then the reaction proceeds with good efficiency, but the catalyst is comparatively expensive and requires removal from the end-product via distillation
Solution Approach 1:
The patent employs metal carbonyl catalysts (such as tungsten hexacarbonyl, molybdenum hexacarbonyl, or their alkyl-substituted derivatives) that are cheaper than phospholene oxide catalysts and do not require removal from the final product. These catalysts can be easily separated by filtration or remain in the reaction mixture without affecting the carbodiimide product, eliminating the need for costly distillation steps.
Solution Approach 2:
The patent modifies the catalyst structure by using metal carbonyl compounds with specific metal centers (tungsten, molybdenum, chromium) and carbonyl ligands, which changes the catalytic parameters to achieve efficient carbodiimide formation without the need for expensive phospholene oxide catalysts. The metal carbonyl catalysts operate under similar or milder conditions while providing cost-effectiveness.
2Object-affected harmful factors
If transition metal carbonyl compounds are used as catalysts, then the process becomes less toxic, but the reaction requires higher temperatures
Solution Approach 1:
The patent optimizes the reaction conditions by adjusting temperature, pressure, and catalyst concentration to achieve efficient carbodiimide formation at moderate temperatures. The metal carbonyl catalysts (tungsten, molybdenum, chromium) facilitate the reaction under controlled conditions that balance toxicity reduction with acceptable temperature requirements.
3Reliability
If conventional catalytic methods are used for carbodiimide preparation, then the process is established, but resource and process efficiency are poor
Solution Approach 1:
The patent improves resource and process efficiency by optimizing reaction parameters such as temperature, pressure, catalyst concentration, and reaction time. The metal carbonyl catalysts enable the reaction to proceed with higher efficiency, reducing material waste and energy consumption while maintaining reliable carbodiimide production.
Solution Approach 2:
The patent replaces conventional catalytic mechanisms with metal carbonyl-based catalysis, which provides superior efficiency. The metal carbonyl catalysts facilitate the carbodiimide formation through enhanced catalytic activity, improving both resource utilization and process efficiency compared to traditional methods.
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 process achieves high selectivity for carbodiimide formation, low-temperature reaction conditions, and excellent yields, while also using less toxic catalytic compounds, thus improving resource and process efficiency.
Implementation Method 1
the process comprises use of a catalytic compound which comprises a metal M and oxygen, wherein the metal M is one or more of Mo and W, and wherein at least a portion of the metal M comprised in the catalytic compound is bound to oxygen via one or more single bonds, via one or more double bonds, or via one or more single and double bonds
Data Source
AI summary
A process for preparing a carbodiimide includes (i) providing a mixture including one or more isocyanates and a catalytic compound, and (ii) subjecting the mixture obtained in (i) to reaction conditions in a gas atmosphere. The catalytic compound includes a metal and oxygen, wherein the metal is one or more of Mo and W. and at least a portion of the metal in the catalytic compound is bound to oxygen via one or more single bonds, via one or more double bonds, or via one or more single and double bonds. The reaction conditions in the gas atmosphere take place at a temperature in a range of from 45 to 220° C.