Systems and methods for production of Xenon-133
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Solution Overview
Problem
Existing methods for producing Xenon-133 from Molybdenum-99 production processes are inefficient, leading to the discarding of this valuable isotope due to inadequate separation and purification techniques from off-gases.
Innovation Solution
A method involving the collection of off-gases from Molybdenum-99 production, selective adsorption of Xenon-133 onto a charcoal column, followed by desorption and condensation using a heating and cooling system, allowing for the isolation and purification of Xenon-133 from other gases like Krypton-85.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional Mo-99 production processes are used, then Mo-99 is produced, but Xe-133 is discarded due to inadequate separation and purification
Solution Approach 1:
The patent employs a porous adsorbent material (such as activated carbon or molecular sieves) in a column to selectively adsorb Xe-133 from the off-gas mixture. The porous structure provides high surface area for adsorption while allowing selective penetration based on molecular size and interaction properties, enabling separation of Xe-133 from other fission gases like Kr-85 and Cs-137.
Solution Approach 2:
The patent utilizes temperature changes to control the adsorption and desorption processes. By cooling the adsorbent column, Xe-133 is preferentially adsorbed from the off-gas. Subsequently, heating the column causes desorption of Xe-133, allowing it to be collected separately. This temperature parameter change enables cyclic operation of the separation system.
2Quantity of substance
If off-gases are collected from Mo-99 production, then Xe-133 can be recovered, but separation from other off-gases like Kr-85 is difficult
Solution Approach 1:
The porous adsorbent material is selected and configured to exploit differences in molecular properties between Xe-133 and other off-gases. The pore size distribution and surface chemistry of the adsorbent are optimized to preferentially adsorb Xe-133 while allowing other gases like Kr-85 to pass through or be adsorbed at different rates, achieving high separation purity.
Solution Approach 2:
By precisely controlling temperature parameters during adsorption and desorption phases, the system achieves selective separation. The temperature is maintained at specific ranges during adsorption to maximize Xe-133 uptake while minimizing co-adsorption of other gases. During desorption, temperature elevation is controlled to release Xe-133 selectively, thereby improving measurement precision and separation purity.
3Manufacturing precision
If selective adsorption of Xe-133 is implemented, then purification is enhanced, but process time increases due to adsorption and desorption cycles
Solution Approach 1:
The system operates in periodic cycles of adsorption and desorption. During adsorption phase, Xe-133 is captured from off-gas. During desorption phase, heated gas or vacuum is applied to release Xe-133 from the adsorbent. This periodic operation allows continuous processing with high purification quality while managing cycle time through optimized transition between phases.
Solution Approach 2:
Rapid parameter changes, particularly temperature transitions, are implemented to reduce cycle time. The system quickly switches between adsorption temperature and desorption temperature, minimizing the time spent in transition states. This allows the periodic process to maintain high purification quality while reducing overall production cycle time.
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 enables the effective separation and purification of Xenon-133, enhancing its yield from raw gases with initially lower concentrations, thereby utilizing Xenon-133 that would otherwise be discarded.
Implementation Method 1
selectively adsorbing Xenon-133 from the off gas onto a charcoal column assembly such that Xenon-133 is selectively adsorbed onto the charcoal column assembly relative to Krypton-85
Implementation Method 2
desorbing the Xenon-133 from the charcoal column assembly by heating the charcoal column assembly
Implementation Method 3
condensing the Xenon-133 within a coil assembly
Data Source
AI summary
Methods and systems for producing Xenon-133 are disclosed. A method for producing Xenon-133 includes collecting an off gas from a Molybdenum-99 production process in a storage tank. The off gas includes Xenon-133 and Krypton-85. The method further includes selectively adsorbing Xenon-133 from the off gas onto a charcoal column assembly such that Xenon-133 is selectively adsorbed onto the charcoal column assembly relative to Krypton-85. The method further includes desorbing the Xenon-133 from the charcoal column assembly by heating the charcoal column assembly, and condensing the Xenon-133 within a coil assembly.