Halon Purification by Metal-Iodide Absorption
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Solution Overview
Problem
Existing halon purification methods, such as distillation and liquid phase extraction, face challenges in achieving high purity due to similar boiling points of halons and bromine molecules, require large-scale equipment, and pose safety risks with alkaline solutions.
Innovation Solution
A halon purification method using an aqueous solution of metal iodides, particularly potassium iodide, for contact and separation steps to remove bromine molecules, avoiding alkaline solutions and large-scale equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a distillation method is used to remove bromine molecules from halon, then the purification can be achieved, but large-scale equipment such as distillation towers is required and the process becomes complex
Solution Approach 1:
The invention extracts and removes only the bromine molecules from the halon mixture using a selective absorbing liquid, rather than separating the entire mixture through distillation. This extraction approach eliminates the need for large-scale distillation equipment while achieving high purification quality.
Solution Approach 2:
The invention changes the separation parameter from thermal properties (boiling point differences used in distillation) to chemical properties (selective absorption). By using an absorbing liquid that selectively reacts with bromine molecules, the process achieves separation without requiring the complex temperature control and large equipment of distillation.
2Manufacturing precision
If a distillation method is used to separate halon and bromine molecules, then purification can be achieved, but the process becomes difficult to simplify due to similar boiling points
Solution Approach 1:
The invention introduces an absorbing liquid as an intermediary substance that selectively reacts with bromine molecules. This mediator enables separation based on chemical affinity rather than thermal properties, bypassing the difficulty of separating components with similar boiling points and simplifying the overall process.
3Productivity
If alkaline solutions are used as absorbing liquids for bromine removal, then the treatment capacity is high, but safety risks increase due to the corrosive and toxic nature of alkaline solutions
Solution Approach 1:
The invention changes the chemical parameter of the absorbing liquid from alkaline to non-alkaline composition. By using non-alkaline absorbing liquids that still effectively capture bromine molecules, the process maintains high treatment capacity while eliminating the safety hazards associated with corrosive and toxic alkaline solutions.
4Quantity of substance
If alkaline solutions are used as absorbing liquids, then bromine absorption can occur, but the removal efficiency of bromine molecules becomes insufficient and halons may be hydrolyzed
Solution Approach 1:
The invention changes the chemical composition parameter of the absorbing liquid from alkaline to non-alkaline. This parameter change optimizes both the bromine removal efficiency and prevents halon hydrolysis, as the non-alkaline composition is less reactive with halons while still effectively capturing bromine molecules.
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 efficiently and safely removes bromine molecules, achieving high purity halon without the need for large-scale equipment and reducing safety hazards.
Implementation Method 1
a contact step of bringing the crude halon into contact with an absorbing liquid containing an aqueous solution containing metal iodide to obtain a mixed liquid containing the crude halon and the absorbing liquid
Data Source
AI summary
There is provided a halon purification method capable of simply, safely, and efficiently removing mixed bromine molecules to obtain high purity halon. The halon purification method is a method for removing bromine molecules from crude halon containing halon and the bromine molecules, and the method includes: a contact step of bringing the crude halon into contact with an absorbing liquid containing an aqueous solution containing metal iodide to obtain a mixed liquid containing the crude halon and the absorbing liquid; and a separation step of separating the halon from the mixed liquid to obtain the halon and the absorbing liquid having absorbed the bromine molecules.