Azeotropic Composition Separation for Trifluoroethylene Purification
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Solution Overview
Problem
The production of trifluoroethylene is hindered by the formation of azeotropic or quasi-azeotropic compositions containing chlorotrifluoroethylene and other fluorinated compounds, which complicates purification and recycling due to their boiling point similarities and difficulty in separation.
Innovation Solution
Development of specific azeotropic or quasi-azeotropic compositions comprising chlorotrifluoroethylene and 1,1,2-trifluoroethane or 1,1-difluoroethane, with defined weight percentages and boiling point ranges, allowing for easier separation and purification by controlling the relative volatility between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex purification stages are implemented to separate by-products from trifluoroethylene, then purification effectiveness is improved, but device complexity and product loss increase
Solution Approach 1:
The patent changes the compositional parameters of the reaction mixture by controlling the molar ratio of CTFE to hydrogen (1:1 to 1:5), temperature (50-150°C), and pressure (1-10 bar) to optimize the hydrogenolysis reaction. This parameter optimization shifts the product distribution to minimize azeotropic by-product formation, thereby reducing purification complexity while maintaining effectiveness
Solution Approach 2:
Instead of attempting to separate difficult-to-separate azeotropic mixtures through complex purification, the invention inverts the approach by optimizing reaction conditions to prevent the formation of problematic azeotropic compositions in the first place, making purification simpler and more efficient
2Manufacturing precision
If complex purification stages are implemented to separate by-products from trifluoroethylene, then purification effectiveness is improved, but product loss increases
Solution Approach 1:
By optimizing reaction parameters including CTFE:h2 molar ratio (1:1 to 1:5), temperature (50-150°C), and pressure (1-10 bar), the process maximizes trifluoroethylene yield while minimizing by-product formation, reducing the amount of product lost during necessary purification steps
Solution Approach 2:
The patent converts the potentially harmful effect of by-product formation into a benefit by carefully controlling reaction conditions to produce a specific distribution of products that are easier to separate, thereby reducing product loss during purification while maintaining effectiveness
3Device complexity
If azeotropic compositions are formed during trifluoroethylene production, then reaction complexity is reduced, but separation difficulty increases
Solution Approach 1:
The invention changes the compositional parameters of the reaction mixture by controlling the molar ratio of CTFE to hydrogen (1:1 to 1:5), temperature (50-150°C), and pressure (1-10 bar) to optimize the hydrogenolysis reaction. This parameter optimization shifts the product distribution to minimize azeotropic by-product formation, thereby reducing purification complexity while maintaining effectiveness
Solution Approach 2:
Instead of attempting to separate difficult-to-separate azeotropic mixtures through complex purification, the invention inverts the approach by optimizing reaction conditions to prevent the formation of problematic azeotropic compositions in the first place, making purification simpler and more efficient
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 identified compositions facilitate improved separation and purification processes by adjusting the boiling point ranges and relative volatilities, enhancing the efficiency of trifluoroethylene production and reducing product loss.
Implementation Method 1
a process for the production of trifluoroethylene by hydrogenolysis of CTFE in the gas phase and in the presence of a catalyst based on a metal from group VIII at atmospheric pressure and at relatively low temperatures
Implementation Method 2
azeotropic or quasi-azeotropic compositions surprisingly identified... said composition has a boiling point of between −40° C. and 40° C. at a pressure of between 0.5 bara and 8 bara
Data Source
AI summary
The present invention relates to an azeotropic or quasi-azeotropic composition comprising chlorotrifluoroethylene and at least one of the compounds selected from the group consisting of 1,1,2-trifluoroethane, 1,1-difluoroethane and a mixture of the two. The present invention also relates to an azeotropic or quasi-azeotropic composition comprising 1,1,2-trifluoroethane and at least one of the compounds selected from the group consisting of 2-chloro-1,1,1-trifluoroethane, 1-chloro-1,1,2-trifluoroethane and a mixture of the two.