1-Chloro-3,3,3-Trifluoropropene Production via Solid Catalyst
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Solution Overview
Problem
Current methods for producing 1-chloro-3,3,3-trifluoropropene generate hydrogen chloride containing hydrogen fluoride as a by-product, which is difficult to use and often disposed of as waste, and result in impurities like 1,3,3-tetrafluoropropene as a by-product, reducing selectivity and environmental sustainability.
Innovation Solution
Introducing hydrogen chloride into the reaction system and using a solid catalyst to convert ozone-depleting substances like 3-chloro-1,1,1,3-tetrafluoropropane or 3,3-dichloro-1,1,1-trifluoropropane to 1-chloro-3,3,3-trifluoropropene, effectively utilizing the generated hydrogen chloride and minimizing by-product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fluorination of 1,1,1,3,3-pentachloropropane with hydrogen fluoride is used to produce 1,1,1,3,3-pentafluoropropane, then the target product is obtained, but hydrogen chloride containing hydrogen fluoride is generated as a by-product that is difficult to use and must be disposed of as waste
Solution Approach 1:
The patent converts the harmful by-product (hydrogen chloride containing hydrogen fluoride) into a useful reagent for the dehydrofluorination reaction. The hydrogen chloride is introduced into the reaction system to promote the conversion of ozone-depleting substances to 1-chloro-3,3,3-trifluoropropene, thereby transforming a waste disposal problem into a productivity enhancement opportunity.
Solution Approach 2:
Instead of discarding the hydrogen chloride by-product through neutralization treatment, the patent recovers and reuses it in the dehydrofluorination reaction. This closed-loop approach prevents waste generation and maximizes material utilization efficiency.
2Productivity
If conventional production methods are used, then 1-chloro-3,3,3-trifluoropropene is produced, but impurities like 1,3,3-tetrafluoropropene are generated, reducing selectivity
Solution Approach 1:
The patent changes the reaction parameters by introducing hydrogen chloride and using a solid catalyst under specific temperature conditions (200-400°C). These parameter changes promote selective dehydrofluorination while suppressing side reactions that lead to impurity formation, thereby improving both productivity and selectivity simultaneously.
3Productivity
If hydrogen chloride is introduced into the reaction system with solid catalyst, then yield of 1-chloro-3,3,3-trifluoropropene is enhanced, but by-product generation must be minimized to maintain environmental friendliness
Solution Approach 1:
The solid catalyst acts as an intermediary that facilitates the desired reaction while suppressing unwanted side reactions. The catalyst provides a controlled reaction pathway that enhances yield of the target product while minimizing the formation of harmful by-products, thus resolving the contradiction between productivity and environmental impact.
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 enhances the yield of 1-chloro-3,3,3-trifluoropropene while efficiently using hydrogen chloride and reducing environmental impact by minimizing by-product generation, such as 1,3,3-tetrafluoropropene, thus providing an environmentally friendly production process.
Implementation Method 1
bringing a composition containing a compound of the general formula (1) into contact with a solid catalyst in the presence of hydrogen chloride
Data Source
AI summary
A production method of 1-chloro-3,3,3-trifluoropropene according to the present invention includes bringing a composition containing a compound of the general formula (1): CF3—CH2—CHClX (where X is a fluorine atom or a chlorine atom) into contact with a solid catalyst in the presence of hydrogen chloride. In this production method, the composition containing ozone depleting HCFC such as 3-chloro-1,1,1,3-tetraluoforpropane or 3,3-dichloro-1,1,1-trifluoropropane can be efficiently converted to the 1-chloro-3,3,3-trifluoropropene, which has less influence on the global environment and is useful as a solvent, a cleaning agent, a coolant, a working fluid, a propellant, a raw material for fluorinated resins etc.