Hydrogen Chloride Mixture Dehydration for Corrosion Control
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Solution Overview
Problem
Conventional methods for producing high-purity hydrogen chloride gas for semiconductor production result in water contamination, leading to corrosion of metal pipes and equipment, particularly stainless steel, due to inadequate dehydration techniques, which increase the risk of hydrogen chloride gas leakage and accidents.
Innovation Solution
A method involving two dehydration steps: initial cooling to condense and separate water, followed by contact with a water adsorbent like zeolite to achieve a hydrogen chloride mixture with a water concentration in the gas phase of 0.001-4.5 mol ppm and liquid phase of 0.01-1 mol ppm, significantly reducing metal corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-purity hydrogen chloride is filled into a filling container, then the initial water concentration is low, but water concentrates in the liquid phase during gasification, causing corrosion
Solution Approach 1:
The patent applies preliminary action by performing dehydration treatment before filling hydrogen chloride into the container. The water concentration is reduced to 10 ppm or less prior to filling, preventing subsequent corrosion issues during gasification. This advance preparation ensures that even as water concentrates during use, it remains below corrosive thresholds.
Solution Approach 2:
The patent changes the water concentration parameter to an extremely low level (10 ppm or less) before filling. This parameter control ensures that during the gasification process, even though water concentrates in the liquid phase, the concentration remains insufficient to cause corrosion of metal components.
2Quantity of substance
If conventional dehydration methods are used, then water is removed to some extent, but water concentration increases during gasification, leading to pipe corrosion
Solution Approach 1:
The patent applies parameter changes by reducing water concentration to an extremely low level (10 ppm or less) before filling. This stringent parameter control ensures that even during complete gasification when water concentrates, the final concentration remains below the threshold for corrosion, thus eliminating the harmful effect.
Solution Approach 2:
The patent applies preliminary anti-action by performing aggressive dehydration before filling to prevent the harmful effect of corrosion. By reducing water to 10 ppm or less in advance, the system preemptively counteracts the concentration effect that occurs during gasification, ensuring corrosion never occurs.
3Reliability
If water concentration is reduced to prevent corrosion, then metal equipment is protected, but dehydration complexity increases
Solution Approach 1:
The patent applies preliminary action by performing complete dehydration to 10 ppm or less before filling. This one-time advance treatment simplifies the overall system by eliminating the need for complex corrosion prevention mechanisms during operation, while providing robust equipment protection.
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 method effectively suppresses metal corrosion by maintaining low water concentrations throughout the gasification process, ensuring the hydrogen chloride mixture does not corrode stainless steel equipment, enhancing safety and efficiency in semiconductor production.
Implementation Method 1
initial cooling to condense and separate water
Implementation Method 2
contact with a water adsorbent like zeolite to achieve a hydrogen chloride mixture with a water concentration in the gas phase of 0.001-4.5 mol ppm
Data Source
AI summary
There is provided a hydrogen chloride mixture hardly corroding a metal. The hydrogen chloride mixture contains hydrogen chloride and water. The hydrogen chloride mixture is filled into a filling container so that a part of the hydrogen chloride mixture is liquid. The concentration of water in a gas phase in the hydrogen chloride mixture is 0.001 mol ppm or more and less than 4.5 mol ppm.