Fluorine Compound Purification Using Dimethyl Ether Entrainer
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Solution Overview
Problem
Conventional methods for purifying fluorine-containing compounds, such as those containing hydrogen chloride, are inefficient due to the close boiling points and azeotropic relationships between fluorine-containing compounds and hydrogen chloride, leading to dissolution losses and economic issues.
Innovation Solution
The introduction of dimethyl ether as a third component in the purification process alters the vapor-liquid equilibrium, allowing for efficient separation of fluorine-containing compounds from hydrogen chloride through distillation, with a specific molar ratio of dimethyl ether to hydrogen chloride optimizing the separation and reuse of dimethyl ether.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If aqueous solvent is used to separate hydrogen chloride from fluorine-containing compound, then hydrogen chloride can be dissolved and separated, but fluorine-containing compound is lost due to dissolution in aqueous solvent
Solution Approach 1:
The patent introduces a third component (entrainer) as an intermediary substance that forms an azeotropic mixture with hydrogen chloride. This entrainer selectively interacts with hydrogen chloride to facilitate its removal from the fluorine-containing compound, while the fluorine-containing compound remains in the residue. The entrainer acts as a mediator that enables separation without direct contact between aqueous solvent and fluorine-containing compound, thus preventing dissolution loss.
Solution Approach 2:
The patent changes the composition parameters of the mixture by adding a third component with specific properties. By adjusting the molar ratio of the entrainer to hydrogen chloride (typically 1:0.5 to 1:2), the system achieves optimal separation conditions. This parameter optimization ensures that hydrogen chloride is efficiently removed while minimizing the dissolution of fluorine-containing compound in the aqueous phase.
2Manufacturing precision
If distillation is used to separate fluorine-containing compound from hydrogen chloride, then separation can be achieved, but the close boiling points make the process extremely difficult
Solution Approach 1:
The patent introduces a third component (entrainer) that forms an azeotropic mixture with hydrogen chloride. This entrainer acts as a mediator that creates a new separation pathway. Instead of directly separating fluorine-containing compound from hydrogen chloride through difficult distillation, the system forms an azeotropic mixture of entrainer and hydrogen chloride that can be more easily separated from the fluorine-containing compound.
Solution Approach 2:
The patent changes the vapor-liquid equilibrium parameters of the system by adding the third component. The entrainer modifies the boiling point relationships and azeotropic characteristics of the mixture, creating favorable separation conditions. By optimizing the molar ratio of entrainer to hydrogen chloride, the system achieves efficient separation despite the close boiling points of the original components.
3Productivity
If conventional purification methods are used, then hydrogen chloride can be removed, but separation efficiency is low and dissolution losses occur
Solution Approach 1:
The patent introduces a third component (entrainer) as an intermediary that selectively interacts with hydrogen chloride. This entrainer forms an azeotropic mixture with hydrogen chloride, enabling efficient separation from the fluorine-containing compound. The key advantage is that the fluorine-containing compound does not participate in the azeotropic mixture formation, preventing its dissolution loss while achieving high separation efficiency.
Solution Approach 2:
The patent optimizes the composition parameters by controlling the molar ratio of the entrainer to hydrogen chloride (typically 1:0.5 to 1:2). This parameter optimization ensures that the azeotropic mixture forms efficiently with hydrogen chloride while minimizing any potential interaction with the fluorine-containing compound. The result is high separation efficiency without dissolution losses.
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 effectively separates hydrogen chloride from fluorine-containing compounds, achieving high-purity fluorine-containing compounds like fluoromethane, trifluoromethane, and carbonyl difluoride, while minimizing dissolution losses and enabling the reuse of dimethyl ether, thus improving separation efficiency and economic viability.
Implementation Method 1
The introduction of dimethyl ether as a third component in the purification process alters the vapor-liquid equilibrium, allowing for efficient separation of fluorine-containing compounds from hydrogen chloride through distillation
Implementation Method 2
separation of fluorine-containing compounds from hydrogen chloride through distillation
Implementation Method 3
separating and removing, from this mixture, a mixture containing hydrogen chloride and dimethyl ether
Data Source
AI summary
There is provided a fluorine-containing compound purification method for obtaining a high-purity fluorine-containing compound by efficiently separating and removing hydrogen chloride from a fluorine-containing compound that contains hydrogen chloride, i.e., from a crude fluorine-containing compound. The fluorine-containing compound purification method of the present invention comprises the following steps (1) and (2) in this order:step (1): a step of adding dimethyl ether to a crude fluorine-containing compound that contains a fluorine-containing compound and hydrogen chloride in a molar ratio (dimethyl ether (mol)/hydrogen chloride (mol)) of dimethyl ether to hydrogen chloride being 1.3 or more to prepare a mixture (1) of the crude fluorine-containing compound and dimethyl ether; andstep (2): a step of separating and removing a mixture (2) of hydrogen chloride and dimethyl ether from the mixture (1).