3He/4He Isotope Separation Through Cryogenic Adsorption Cycles
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Solution Overview
Problem
Current methods are inadequate for efficiently separating and enriching the rare isotope 3<He from the more abundant isotope 4<He, which is necessary due to increasing demand, particularly for scientific and medical applications.
Innovation Solution
A process involving adsorption of a 3<He/4<He-containing gas onto an adsorbent, followed by selective desorption at specific temperatures to release 3<He, utilizing activated carbon or an ion getter, and repeating these steps to achieve enrichment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional separation methods are used, then the separation process can be performed, but the enrichment factor is insufficient and the process is not economically viable
Solution Approach 1:
The patent changes the temperature parameter during the adsorption and desorption processes to achieve selective separation of helium isotopes. By controlling temperature variations, the method achieves an enrichment factor of at least 1.5 times for 3He relative to 4He, resolving the contradiction between separation precision and enrichment efficiency
Solution Approach 2:
The patent utilizes phase transitions of gases during adsorption and desorption processes. The cyclic adsorption at lower temperatures and desorption at higher temperatures enables selective enrichment of 3He, achieving both high separation precision and economic viability through efficient enrichment
2Manufacturing precision
If multiple separation steps are repeated to achieve higher enrichment, then the enrichment factor increases, but the process time and complexity increase
Solution Approach 1:
The patent employs periodic cyclic adsorption and desorption steps to achieve progressive enrichment of 3He. By repeating the adsorption-desorption cycle, the enrichment factor increases to at least 1.5 times while maintaining reasonable process time through efficient cyclic operation rather than continuous linear processing
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
Enriches 3<He up to 1.5 times compared to 4<He, providing a sufficient supply for generating low temperatures and medical imaging applications.
Implementation Method 1
a) performing adsorption of a 3He/4He-containing gas onto an adsorbent at a temperature in the range of 5 K to 12 K
Implementation Method 2
b) performing selective desorption of the adsorbent with heating to a further temperature in the range of 13 K to 40 K
Data Source
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AI summary
The invention relates to a method for separating, enriching, and recovering the 3He isotope from the 4He isotope, comprising the following steps: a) adsorbing a 3He/4He-containing gas onto an adsorbent, and b) performing selective desorption such that 3He is released from the adsorbent. Furthermore, the invention relates to the use of the separated, enriched, and recovered 3He isotope obtained by the method for generating a temperature in the range of 0.01 to 0.05 K, preferably 0.02 K, or as a contrast agent for magnetic resonance imaging.