Fluoroethylene Production via Metal Fluoride Isomer Selectivity
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Solution Overview
Problem
Existing methods for producing fluoroethylene compounds like HFO-1132(Z/E) and HFO-1123 are inefficient and often result in mixtures of isomers, lacking selective production.
Innovation Solution
A method involving the reaction of halogenated ethylenes with metal fluorides, such as lithium, sodium, or cesium fluoride, in a liquid-phase batch process with controlled reaction conditions, allows for the selective production of fluoroethylene compounds like HFO-1132(E) or HFO-1132(Z) without isomer mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods are used to produce fluoroethylene compounds, then production can be achieved, but the production efficiency is low and isomer mixtures are obtained instead of selective production
Solution Approach 1:
The patent applies parameter changes by modifying the reaction conditions including using specific metal fluorides (LiF, NaF, KF, CsF) as catalysts, controlling reaction temperature (100-300°C), and adjusting the molar ratio of reactants. These parameter changes enable selective production of desired fluoroethylene isomers while improving production efficiency
Solution Approach 2:
The patent uses metal fluorides as intermediary substances that facilitate the reaction between halogenated ethylenes and hydrogen. These metal fluoride intermediaries enable selective fluorine substitution while maintaining isomer purity, resolving the contradiction between production efficiency and selectivity
2Quantity of substance
If conventional production methods are used, then fluoroethylene can be produced, but the product contains isomer mixtures reducing purity
Solution Approach 1:
The patent applies local quality by using specific metal fluorides that provide localized catalytic activity for selective fluorine substitution. Different metal fluorides (LiF, NaF, KF, CsF) offer different local catalytic properties that can be selected to achieve high isomer purity while maintaining good yield
Solution Approach 2:
By changing reaction parameters such as temperature (100-300°C), pressure, and molar ratios of reactants, the patent achieves both high yield and high isomer purity, resolving the contradiction between quantity and precision
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 efficient and selective production of fluoroethylene compounds with high yield and purity, suitable for applications in refrigerants, solvents, and propellants.
Implementation Method 1
reacting at least one halogenated ethylene compound with a metal fluoride
Data Source
AI summary
An object of the present invention is to provide a method for efficiently obtaining fluoroethylene. A method for producing HFO-1132(Z/E) comprising reacting a halogenated ethylene represented by formula (1): CHX1═CHX2 (1), wherein X1 and X2 are identical or different, and each represents chlorine, bromine, or iodine, with a metal fluoride. A method for producing HFO-1123, comprising reacting a halogenated ethylene represented by formula (2): CX3X4═CHX5 (2), wherein X3, X4, and X5 are identical or different, and each represents chlorine, bromine, or iodine, with a metal fluoride.