Argon Recovery Rectification With Stripping Recycle for Ammonia Tail Gas
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Solution Overview
Problem
Current argon recovery processes from ammonia production plants are complex and costly, requiring multiple columns, vaporizers, compressors, and heat exchangers, making them inefficient for cost-effective argon and nitrogen separation from tail gases.
Innovation Solution
A system and method involving conditioning of the feed stream to a suitable temperature and pressure for distillation, followed by separation in a rectification column to produce argon-depleted and enriched streams, with subsequent argon stripping and recycling, utilizing an auxiliary rectification column for high-purity argon and nitrogen production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional argon recovery processes are used from ammonia production plants, then argon can be recovered from tail gas, but the process becomes complex requiring multiple columns, vaporizers, compressors, and heat exchangers
Solution Approach 1:
The patent extracts only the essential separation function needed for argon recovery, eliminating unnecessary equipment. The process uses a single distillation column with selective side draws to separate argon, nitrogen, and methane from tail gas, removing the need for multiple columns, vaporizers, compressors, and heat exchangers while maintaining effective argon recovery
Solution Approach 2:
The distillation column is designed to perform multiple separation functions simultaneously - separating argon, nitrogen, and methane in a single unit operation. The column achieves both argon enrichment and nitrogen purification through strategic draw points and reflux management, consolidating what would traditionally require multiple specialized units
2Quantity of substance
If conventional argon recovery processes are used, then argon separation can be achieved, but operational costs increase due to multiple equipment requirements
Solution Approach 1:
The patent employs a simpler, more economical process design that eliminates expensive equipment investments. By using a single distillation column instead of multiple complex units, the process reduces both capital expenditure and operational maintenance costs while achieving the same argon separation objective
3Manufacturing precision
If multiple columns and equipment are used for argon recovery, then separation purity can be maintained, but process efficiency decreases
Solution Approach 1:
The patent segments the separation process into strategic draw points within a single column - taking argon-rich vapor from one location, liquid argon from another, and nitrogen from a third position. This segmented approach within one unit achieves the same purity outcomes as multiple columns would provide, but with improved efficiency and reduced complexity
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 simplifies argon recovery, achieving 85-90% recovery efficiency with reduced operational pressures, promoting cost-effectiveness and process efficiency by integrating argon and nitrogen recycling within the ammonia production plant.
Implementation Method 1
separating the conditioned feed stream in the rectification column to produce an argon-depleted nitrogen-enriched vapor stream, an argon-enriched stream, and a methane-rich liquid stream
Implementation Method 2
directing the methane-rich liquid stream into a stripping column configured to remove residual argon from the methane-rich liquid stream
Data Source
AI summary
A system and method for argon and nitrogen extraction from a feed stream comprising hydrogen, methane, nitrogen and argon, such as tail gas of an ammonia production plant is provided. The disclosed system and method provides for nitrogen-argon rectification and the methane rejection within a column system comprised of at least one distillation column. Nitrogen and argon are further separated and to produce liquid products. An argon stripping column arrangement is disclosed where residual argon is further removed from the methane-rich fuel gas and recycled back to the feed stream.