Krypton–Xenon Separation Using Natural Clinoptilolite Adsorption
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Solution Overview
Problem
Existing methods for separating krypton (Kr) gas from xenon (Xe) gas are energy intensive and inefficient, particularly in cryogenic distillation, and nano porous adsorbents are not selective enough for Kr, leading to difficulties in separating Kr from air components.
Innovation Solution
Utilizing natural clinoptilolite as an adsorbent to selectively adsorb Kr gas from mixed gas streams at atmospheric conditions, followed by regeneration to release a Kr-enriched product, and optionally using multiple stages with Xe adsorbents to achieve high purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cryogenic distillation is used to separate Kr gas and Xe gas, then separation can be achieved, but the process becomes energy intensive and complicated
Solution Approach 1:
The patent replaces the mechanical cryogenic distillation system with a chemical adsorption system using metal-organic frameworks. The MOF adsorbent selectively binds Kr and Xe gases through chemical interactions at pore sites, eliminating the need for energy-intensive cryogenic temperature maintenance and mechanical distillation processes while achieving effective separation
Solution Approach 2:
The patent employs metal-organic framework porous materials with specifically engineered pore sizes and chemical environments. These porous structures provide selective adsorption sites that preferentially bind Kr and Xe gases from dilute mixtures, enabling separation at near-ambient conditions without requiring cryogenic distillation infrastructure
2Quantity of substance
If metal-organic frameworks are used as adsorbents, then Kr and Xe can be concentrated from dilute mixtures, but separation of Kr from air components becomes difficult and inefficient
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the MOF structure. Different pore regions have tailored chemical environments - some with open metal sites for Kr binding, others with specific functional groups for Xe interaction. This spatial differentiation of adsorption properties within the single material enables selective Kr separation from air components while maintaining concentration capability
Solution Approach 2:
The patent utilizes composite metal-organic framework materials combining multiple metal centers and organic linkers with complementary adsorption properties. The composite structure integrates Kr-selective sites (e.g., open metal sites from certain metal clusters) with Xe-interacting regions (e.g., polar functional groups), enabling simultaneous concentration and selective separation of both noble gases from air mixtures
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 allows for energy-efficient separation and purification of Kr and Xe gases with reduced capital costs, utilizing abundant and readily available clinoptilolite, achieving high throughput and purity levels.
Implementation Method 1
A feed gas comprising Kr gas, Xe gas and optionally other gases is exposed to the Kr adsorbent bed for a residence time to selectively adsorb sufficient Kr gas from the feed gas
Implementation Method 2
the Kr adsorbent bed is regenerated to release a Kr enriched gas extract product
Data Source
AI summary
A system and method for separating Kr gas from Xe gas utilizing natural clinoptilolite. The method includes separating Kr gas from Xe gas by selectively adsorbing Kr gas. The method includes providing a vessel comprising a Kr adsorbent bed comprising a natural clinoptilolite adsorbent. A feed gas comprising Kr gas and Xe gas is exposed to the Kr adsorbent bed for a residence time to selectively adsorb sufficient Kr gas from the feed gas to form a Xe enriched gas raffinate product. The Xe enriched gas raffinate product is removed from the vessel. Thereafter, the Kr adsorbent bed is regenerated to release a Kr enriched gas extract product.