VDF Extraction Solvent Selection for Low-Energy Trifluoromethane Separation
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Solution Overview
Problem
Existing methods for separating vinylidene fluoride and trifluoromethane require high energy for distillation due to the use of high-boiling-point extraction solvents, making it difficult to obtain high-purity vinylidene fluoride and efficiently recover the solvent.
Innovation Solution
The method involves mixing a mixture of vinylidene fluoride and trifluoromethane with a compound having a boiling point between -60 to 0°C, such as hydrofluorocarbons, to facilitate separation using distillation, where the interaction distance between trifluoromethane and the compound is less than that between vinylidene fluoride and the compound, allowing for lower energy solvent recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-boiling-point extraction solvents are used for separating vinylidene fluoride and trifluoromethane, then separation effectiveness is improved, but energy consumption for distillation increases
Solution Approach 1:
The patent changes the boiling point parameter of the extraction solvent from high (conventional) to low (specifically -60 to 0°C range). This parameter change allows the solvent to be easily separable from vinylidene fluoride through distillation, reducing energy consumption while maintaining separation effectiveness. The low boiling point solvent evaporates at lower temperatures, requiring less energy for recovery.
Solution Approach 2:
Instead of using high-boiling-point solvents that require energy-intensive distillation, the patent inverts the approach by using low-boiling-point solvents. This inversion allows the solvent to naturally separate from the higher-boiling vinylidene fluoride with minimal energy input, turning the distillation process from an energy-consuming operation to an energy-efficient process.
2Manufacturing precision
If conventional extraction solvents are used, then vinylidene fluoride can be separated, but solvent recovery becomes difficult and energy-intensive
Solution Approach 1:
The patent changes the boiling point parameter of the extraction solvent to a low range (-60 to 0°C), which fundamentally alters the solvent recovery process. This parameter change makes the solvent easily recoverable through simple distillation or evaporation, transforming solvent recovery from a difficult, energy-intensive operation to an easy, low-energy process while maintaining effective separation capability.
3Manufacturing precision
If high-boiling-point solvents are used for extraction, then separation can be achieved, but the distillation process requires excessive energy
Solution Approach 1:
The patent changes the boiling point parameter of the extraction solvent from high to low (-60 to 0°C range). This parameter change directly reduces distillation energy loss because the solvent requires minimal heating to evaporate and can be recovered with very low energy input, while still achieving high separation purity of vinylidene fluoride.
Solution Approach 2:
The patent converts the potential harm of low-boiling-point solvents (which might be considered volatile or difficult to control) into a benefit. The low boiling point, which could be seen as a disadvantage, actually becomes advantageous by enabling easy, low-energy recovery and minimizing energy loss during the distillation process, while maintaining effective separation.
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 approach enables the production of high-purity vinylidene fluoride and efficient recovery of the extraction solvent at lower energy consumption, improving the separability and reducing energy requirements.
Implementation Method 1
an interaction distance Ra between trifluoromethane and the compound is less than an interaction distance Rb between vinylidene fluoride and the compound
Implementation Method 2
a step of distilling the mixture for extraction, to independently obtain a distillate including vinylidene fluoride as a main component, and a bottom including a compound having a boiling point of from -60 to 0°C as a main component
Data Source
AI summary
A method of separating vinylidene fluoride and trifluoromethane, and the like are provided. The method includes: a step of mixing a mixture including vinylidene fluoride and trifluoromethane with a compound having a boiling point of from -60 to 0°C, to obtain a mixture for extraction; and a step of distilling the mixture for extraction, to independently obtain a distillate including vinylidene fluoride as a main component, and a bottom including a compound having a boiling point of from -60 to 0°C as a main component and further including trifluoromethane.