Metallic Sodium Purification via Vacuum Distillation
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Solution Overview
Problem
Conventional methods for purifying metallic sodium for use in internal combustion engine valves fail to effectively remove organic solvents like kerosene or liquid paraffin, leading to reduced cooling efficiency and manufacturing yield due to surface examination requirements and oxidation issues.
Innovation Solution
A method involving a sealed melting tank under reduced pressure to vaporize and remove organic solvents from metallic sodium, followed by physical removal of sodium oxide layers and filtration to achieve high-purity metallic sodium without surface examination, using a solvent trap for solvent recycling and a cold trap for oxide removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metallic sodium is taken out from organic solvent and used as bulk body, then loading into engine valve is simplified, but surface cracks and organic solvent coating reduce purity and cause contamination
Solution Approach 1:
The patent changes the physical state of metallic sodium from solid bulk body to liquid form by heating above melting point (98°C). This parameter change allows the sodium to flow and fill the valve stem cavity completely, eliminating surface cracks and ensuring uniform distribution without requiring complex surface preparation or examination processes.
Solution Approach 2:
The patent extracts and removes organic solvent coating from the metallic sodium surface through heating and vaporization processes. By taking out the harmful organic solvent layer, the purity of metallic sodium is improved while maintaining the simplicity of bulk body loading into the valve stem.
2Manufacturing precision
If surface examination and cutting of defective metallic sodium is performed, then purity is improved, but manufacturing time increases and yield decreases
Solution Approach 1:
The patent applies self-service by allowing the metallic sodium to purify itself through heating. The organic solvent coating and surface oxides are automatically removed via vaporization and melting processes, eliminating the need for manual surface examination and cutting operations. This self-purification maintains high purity while significantly improving manufacturing yield and reducing time consumption.
Solution Approach 2:
By changing the temperature parameter above the melting point of metallic sodium, the patent enables automatic removal of surface contaminants through melting and vaporization. This parameter change transforms the purification process from manual inspection and cutting to an automated thermal process, thereby improving both purity and productivity.
3Manufacturing precision
If metallic sodium is melted to remove cracks and organic solvent, then purity is improved, but oxidation by atmospheric oxygen occurs
Solution Approach 1:
The patent creates an inert atmosphere by heating metallic sodium in a sealed container where atmospheric oxygen is excluded. The heating process occurs in a controlled environment without direct contact with air, preventing oxidation of the sodium surface during melting and purification. This inert environment allows complete removal of organic solvent and cracks while avoiding harmful oxidation reactions.
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 ensures the removal of organic solvents and sodium oxides, improving the purity and yield of metallic sodium, reducing the need for surface examination and enhancing the cooling efficiency of engine valves.
Implementation Method 1
heating the melting tank under reduced pressure to vaporize and remove the first organic solvent coating the metallic sodium
Implementation Method 2
melting the metallic sodium
Implementation Method 3
heating the melting tank under reduced pressure to vaporize and remove the first organic solvent
Implementation Method 4
cooling the melted metallic sodium to a temperature near a melting point of the metallic sodium, precipitating impurities such as sodium oxides dissolved in the melted metallic sodium
Data Source
AI summary
It is preferable that metallic sodium to be loaded to an engine valve used for an internal combustion engine such as automobile engine have high purity. However, conventionally, an organic solvent remaining in micropores on a surface of the metallic sodium have been hardly attracted attention. Provided is a method for purifying metallic sodium including steps of placing metallic sodium containing organic solvent in the micropores thereof in a melting tank which is sealed, and heating the melting tank under reduced pressure to vaporize and remove the organic solvent coating the metallic sodium.