Fluoromethane Production via Gas-Phase Pyrolysis of Ether
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Solution Overview
Problem
Current methods for producing fluoromethane and 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride face issues such as catalyst deterioration, corrosion, high energy requirements, low yields, and inefficiencies in separation and production costs, making them unsuitable for industrial-scale production.
Innovation Solution
A method involving the pyrolysis of 1,1,3,3,3-pentafluoro-2-trifluoromethylpropyl methyl ether in a gas phase using a catalyst, where the starting material is obtained by reacting perfluoroisobutylene and methanol, allowing for high-yield production of fluoromethane and 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride with minimal by-products and using inexpensive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If method (1) using methyl alcohol and hydrogen fluoride with catalyst is used, then fluoromethane can be produced, but catalyst deteriorates due to water production and corrosion occurs from hydrofluoric acid
Solution Approach 1:
The invention extracts and eliminates the harmful by-products (water and hydrofluoric acid) from the reaction system by using a different chemical pathway. The new method uses perfluoroisobutylene and methanol as reactants, which do not produce water or corrosive hydrofluoric acid, thereby preventing catalyst deterioration and corrosion while maintaining fluoromethane production efficiency.
Solution Approach 2:
The invention changes the chemical parameters of the reaction system by replacing the reactants and reaction mechanism. Instead of using methyl alcohol and hydrogen fluoride (which produce water and HF), the new method uses perfluoroisobutylene and methanol, fundamentally altering the reaction pathway to eliminate harmful by-products and protect the catalyst.
2Productivity
If method (2) using methyl chloride and hydrogen fluoride is used, then fluoromethane production improves, but excess hydrogen fluoride is needed and recycling requires larger equipment increasing cost
Solution Approach 1:
The invention removes the need for excess hydrogen fluoride and its associated recycling infrastructure by using a self-sufficient reaction system. The new method using perfluoroisobutylene and methanol achieves complete conversion without requiring HF recycling equipment, thereby reducing device complexity and production costs while maintaining high fluoromethane yield.
Solution Approach 2:
The invention replaces the expensive and complex hydrogen fluoride recycling system with a simpler, more economical approach. By using perfluoroisobutylene as a reactant that provides its own fluorine atoms, the method eliminates the need for costly HF recovery and recycling equipment, reducing both capital investment and operational complexity.
3Productivity
If method (3) pyrolyzing 1-methoxy-1,1,2,2-tetrafluoroethane is used, then fluoromethane can be produced, but energy is required for cooling to separate from difluoroacetyl fluoride and impurities
Solution Approach 1:
The invention extracts and eliminates the problematic co-product difluoroacetyl fluoride from the reaction system by using a different starting material. The new method using perfluoroisobutylene produces fluoromethane without generating difluoroacetyl fluoride or other low-boiling-point impurities, thereby eliminating the need for energy-intensive cooling and separation processes.
Solution Approach 2:
The invention changes the physical and chemical parameters of the reaction by using perfluoroisobutylene instead of 1-methoxy-1,1,2,2-tetrafluoroethane. This fundamental change in reactant structure leads to different reaction products that do not require complex separation, dramatically reducing energy consumption for cooling and purification.
4Productivity
If 1-methoxy-1,1,2,2-tetrafluoroethane is used as starting material, then fluoromethane can be produced, but separation of trifluoromethane impurity is difficult due to close boiling points
Solution Approach 1:
The invention removes the source of trifluoromethane impurity by using perfluoroisobutylene as the starting material instead of 1-methoxy-1,1,2,2-tetrafluoroethane. The new reaction pathway does not generate trifluoromethane as a by-product, thereby eliminating the separation problem and ensuring high fluoromethane purity without requiring complex distillation processes.
5Productivity
If Patent Literature 4 method using SbF5 catalyst in liquid phase is used, then 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride can be produced, but SbF5 is expensive and corrodes metallic reaction kettles
Solution Approach 1:
The invention replaces the expensive and corrosive SbF5 catalyst with a simple, inexpensive, and non-corrosive solid acid catalyst. The new catalyst system is cost-effective, does not corrode reaction equipment, and can be easily handled, thereby eliminating the harmful effects associated with SbF5 while maintaining high product yield.
Solution Approach 2:
The invention changes the physical state and chemical properties of the catalyst system. By using a solid acid catalyst instead of liquid SbF5, the method eliminates corrosion issues and reduces cost while maintaining catalytic activity. The solid catalyst can be easily separated from the reaction mixture and does not require special corrosion-resistant equipment.
6Productivity
If Patent Literature 4 batch reaction method is used, then 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride can be produced, but production efficiency is inferior to continuous gas phase reaction
Solution Approach 1:
The invention transforms the static batch reaction process into a dynamic continuous flow process. The continuous gas-phase reaction allows for constant feed of reactants and removal of products, maintaining optimal reaction conditions throughout the process and significantly improving production efficiency compared to batch methods where reaction conditions change over time.
Solution Approach 2:
The invention implements continuous reaction and processing, eliminating the downtime associated with batch reactions (loading, unloading, cleaning). The continuous gas-phase process maintains constant reaction conditions and allows for uninterrupted production, thereby maximizing the useful action time and improving overall production efficiency.
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 achieves high conversion and selectivity of the starting material to produce fluoromethane and 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride efficiently and inexpensively, suitable for industrial production, while avoiding costly catalysts and corrosion issues.
Implementation Method 1
pyrolyzing 1,1,3,3,3-pentafluoro-2-trifluoromethylpropyl methyl ether in a gas phase in the presence of a catalyst
Implementation Method 2
pyrolyzing 1,1,3,3,3-pentafluoro-2-trifluoromethylpropyl methyl ether in a gas phase
Data Source
AI summary
Provided is a method for producing fluoromethane and 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride ((CF3)2CHCOF), which are useful as dry etching gases etc., safely and inexpensively with high purity.According to the method in which 1,1,3,3,3-pentafluoro-2-trifluoromethylpropyl methyl ether is pyrolyzed in a gas phase in the presence of a catalyst, the desired fluoromethane and 3,3,3-trifluoro-2-(trifluoromethyl)propanoyl fluoride can be obtained with high selectivity and high conversion of the starting material by a simple process in which a pyrolysis reaction is performed in a gas phase using the inexpensive starting material.