Cryogenic Argon Purification Using PSA to Prevent Column Dumping
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Solution Overview
Problem
Current methods for producing high purity argon are energy-intensive and impractical in regions with limited hydrogen availability, and they often require large cryogenic distillation columns or multiple adsorption beds, which can lead to instability in cryogenic distillation columns due to nitrogen accumulation, causing 'column dumping' and contamination.
Innovation Solution
A method involving a cryogenic distillation column combined with a pressure swing adsorption system, where the argon-containing fluid is compressed and processed through pressure swing adsorption vessels with carbon molecular sieve adsorbents to remove oxygen and nitrogen, and the depressurization gas is regulated to maintain stability and efficiency in the distillation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large or superstaged argon column is used for cryogenic distillation only, then high purity argon can be produced, but the system becomes complex and unstable due to nitrogen accumulation causing column dumping
Solution Approach 1:
The system divides the argon purification process into two separate functional units: a cryogenic distillation column for initial separation and a PSA unit for final purification. This segmentation allows each unit to be optimized for its specific function, avoiding the need for an overly complex single-column system while maintaining high argon purity.
Solution Approach 2:
The PSA unit acts as an intermediary between the cryogenic distillation column and the final argon product. It receives the crude argon stream containing nitrogen and oxygen, selectively adsorbs these contaminants, and delivers high purity argon, thereby protecting the distillation column from instability caused by nitrogen accumulation.
2Manufacturing precision
If multiple adsorption beds in VPSA process are used, then argon purification can be achieved, but the device complexity and pressure swing requirements increase
Solution Approach 1:
The invention merges the cryogenic distillation process with a simplified PSA process using carbon molecular sieve. By combining these two methods, the system achieves high argon purity without requiring multiple complex adsorption beds or vacuum pressure swing operations, thereby reducing overall device complexity while maintaining purification effectiveness.
3Manufacturing precision
If deoxo method with hydrogen is used, then oxygen removal can be achieved, but energy consumption increases due to heating and cooling cycles
Solution Approach 1:
The invention replaces the thermal-based deoxo method with a pressure-based PSA process using carbon molecular sieve. Instead of heating the gas stream to high temperatures for catalytic reaction and then cooling it back, the system uses pressure swing adsorption to selectively remove oxygen at ambient or near-ambient temperatures, dramatically reducing energy consumption while achieving the same oxygen removal efficiency.
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 allows for the production of high purity argon (>99.999 mole %) with reduced nitrogen and oxygen levels, minimizing column dumping and maintaining stability in the cryogenic distillation column, while optimizing argon recovery and reducing energy consumption.
Implementation Method 1
a pressure swing adsorption system, where the argon-containing fluid is compressed and processed through pressure swing adsorption vessels with carbon molecular sieve adsorbents to remove oxygen and nitrogen
Implementation Method 2
processed through pressure swing adsorption vessels with carbon molecular sieve adsorbents to remove oxygen and nitrogen
Implementation Method 3
pressure swing adsorption vessels with carbon molecular sieve adsorbents
Implementation Method 4
a cryogenic rectification column
Implementation Method 5
cryogenic distillation column
Implementation Method 6
the argon-containing fluid is compressed and processed through pressure swing adsorption vessels
Data Source
AI summary
A method and apparatus for producing high purity argon by combined cryogenic distillation and adsorption technologies is disclosed. Crude argon from a distillation column or a so-called argon column is passed to a system of adsorption vessels for further purification. Depressurization gas from adsorption is introduced back, in a controlled manner, to the distillation column and/or a compressor or other means for increasing pressure. Particulate filtration and getter purification may optionally be used.