Extraction Chromatography Resin Concentration of Actinium

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Solution Overview

Problem

Current methods for concentrating actinium (Ac) and radium (Ra) from dilute solutions, such as evaporation followed by anion exchange, are complex, costly, and require harsh chemical conditions, limiting their efficiency and effectiveness.

Innovation Solution

The use of extraction chromatography resins, specifically BDGA resin, to retain trivalent actinides between 4 and 6 M HNO3, allowing for recovery in good yields with small volumes of dilute acids, thereby concentrating the solution without the need for lengthy evaporation steps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If evaporation followed by anion exchange is used to concentrate Ac-225, then separation of Ac-225 from Th-229 and Ra-225 is achieved, but the process becomes complex, costly, and requires harsh chemical conditions

Engineering Contradiction:

Improveseparation efficiencyVSAvoidprocess complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and removes the evaporation step from the conventional process sequence. By using extraction chromatography resin that selectively retains trivalent actinides in dilute acid solutions, the method directly concentrates Ac-225 without requiring prior evaporation, thereby simplifying the overall process while maintaining separation efficiency

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces extraction chromatography resin as an intermediary medium between the dilute solution and the final concentrated product. This resin acts as a selective mediator that concentrates trivalent actinides in dilute acid, eliminating the need for harsh evaporation conditions and complex multi-step processing

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If evaporation steps are used to concentrate Ac-225, then concentration is achieved, but the process requires lengthy evaporation steps that increase time and cost

Engineering Contradiction:

ImproveconcentrationVSAvoidprocessing time

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The patent replaces the thermal evaporation mechanism with a chemical separation mechanism based on extraction chromatography. The resin column performs concentration through selective retention and elution of trivalent actinides in dilute acid, eliminating the need for time-consuming evaporation operations while achieving equivalent or superior concentration

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Quantity of substance

If cation resins are used to concentrate Ac-225 from bulk solutions, then concentration is achieved, but harsh chemical conditions are required to recover Ac-225

Engineering Contradiction:

ImproveconcentrationVSAvoidharsh chemical conditions

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameters by using extraction chromatography resin that operates effectively in dilute acid conditions (4-6 M HNO3) rather than requiring the harsh conditions needed for cation resin elution. This parameter change allows Ac-225 recovery in mild acidic conditions, eliminating the harmful harsh chemical environment while maintaining high concentration capability

Inventive Principle:

Principle #35Parameter changes

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 significantly reduces the cost and complexity of the process, achieves higher concentrations of Ac and Ra, and allows for earlier separation of Ra from Ac, simplifying downstream handling and processing.

Implementation Method 1

extraction chromatography resins strongly retain trivalent actinides between 4 and 6 M HNO3

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

use of extraction chromatography resins to concentrate Ac from dilute solutions

Methodology Applied

Scientific EffectChromatography: Chromatography

Data Source

PatentUS20250191800A1Method and system for the concentration of radium and actinium from dilute solutions

Publication Date: 2025.06.12 TERRAPOWER ISOTOPES LLC

AI summary

Disclosed herein are methods and systems for the use of extraction chromatography resins to concentrate Ac from dilute solutions that may contain Th isotopes and/or other isotopes, such as Ra. As disclosed herein, at least some extraction chromatography resins strongly retain trivalent actinides between 4 and 6 M HNO3 that can be recovered in good yields with small volumes of dilute acids. These small volumes of acid eluents result in significant concentration of the solution of the trivalent/certain tetravalent ions, such that they can be further processed without requiring lengthy evaporation steps that are utilized in standard Ac concentration methods.