Dehydrochlorination of HCFC-336 Isomers to Hexafluoro-2-Butyne
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Solution Overview
Problem
The fluorocarbon industry faces challenges in finding efficient synthesis methods for halogenated hydrocarbons and fluoroolefins that have zero chlorine and low global warming potential, as existing methods require harsh conditions that can lead to degradation and toxicity issues.
Innovation Solution
A process involving the reaction of chlorinated reactants with an aqueous solution of alkali metal hydroxide in the presence of quaternary alkylammonium salts and non-ionic surfactants, which facilitates dehydrochlorination at temperatures below 100°C, effectively converting dichloro-1,1,1,4,4-hexafluorobutane to hexafluoro-2-butyne with high conversion rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If harsh conditions are used for dehydrochlorination, then conversion rate improves, but degradation and toxicity issues worsen
Solution Approach 1:
The patent changes the temperature parameter from harsh high-temperature conditions to mild temperatures below 100°C, and modifies the reaction medium by introducing a phase transfer catalyst system that enables high conversion rates under these milder parameters, thereby resolving the contradiction between productivity and harmful effects
Solution Approach 2:
The phase transfer catalyst acts as an intermediary that facilitates the dehydrochlorination reaction under mild conditions. The catalyst enables the reaction to proceed efficiently at temperatures below 100°C without requiring harsh conditions, thus maintaining high conversion rates while avoiding degradation and toxicity issues
2Speed
If high temperature is used for synthesis, then reaction speed improves, but product degradation worsens
Solution Approach 1:
The patent changes the temperature parameter from high temperature to below 100°C, and introduces a phase transfer catalyst that compensates for the reduced thermal energy by providing an alternative reaction pathway with lower activation energy, thereby maintaining fast reaction speeds while preventing product degradation
Solution Approach 2:
The patent replaces thermal energy (mechanical heating) with chemical catalysis. Instead of relying on high temperature to drive the reaction, a phase transfer catalyst is used to lower the activation energy barrier, substituting thermal activation with catalytic activation, thus achieving fast reaction rates without high temperatures that cause degradation
3Ease of manufacture
If conventional synthesis methods are used, then manufacturing simplicity is maintained, but environmental friendliness worsens
Solution Approach 1:
The patent changes the temperature parameter to below 100°C and uses a phase transfer catalyst system that simplifies the manufacturing process by eliminating the need for harsh conditions while producing environmentally friendly hexafluoro-2-butyne with zero chlorine content and low global warming potential
Solution Approach 2:
The patent converts the potential harm of requiring complex manufacturing conditions into a benefit by using a phase transfer catalyst that simplifies the process. The catalyst system transforms what would be a complex multi-step process into a simpler single-step reaction that operates under mild conditions and produces environmentally benign products
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 rates of dichloro-1,1,1,4,4-hexafluorobutane to hexafluoro-2-butyne, reducing toxicity and operational costs while avoiding the degradation associated with higher temperatures, thus providing a more efficient and environmentally friendly synthesis process.
Implementation Method 1
reacting a chlorinated reactant with an aqueous solution of an alkali metal hydroxide in the presence of a phase transfer catalyst
Implementation Method 2
reacting a chlorinated reactant with an aqueous solution of an alkali metal hydroxide... effectively converting dichloro-1,1,1,4,4-hexafluorobutane to hexafluoro-2-butyne
Data Source
AI summary
Disclosed is a process for producing hexafluoro-2-butyne comprising, reacting HCFC-336 with an aqueous solution of an alkali metal hydroxide in the presence of a quaternary alkylammonium salt which comprises at least one alkyl group of at least 8 carbons, and recovering the hexafluoro-2-butyne, wherein the conversion of dichloro-1,1,1,4,4,4-hexafluorobutane is at least 50% per hour. Also disclosed is a process for producing hexafluoro-2-butyne comprising, reacting HCFC-336 with an aqueous solution of an alkali metal hydroxide in the presence of a quaternary alkylammonium salt having alkyl groups of from four to ten carbon atoms, and mixtures thereof, and a non-ionic surfactant, and recovering the hexafluoro-2-butyne, and wherein the conversion of dichloro-1,1,1,4,4,4-hexafluorobutane to hexafluoro-2-butyne is at least 20% per hour.