Sequestration Resin Cobalt Removal via Sulfamide Linkage

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Solution Overview

Problem

Current ion exchange resins are inefficient in removing radiocobalt from reactor coolant systems, leading to delays and increased radiation exposure during reactor shutdowns, as they are pH-dependent and prone to transition metal hydroxide precipitate formation within their pores.

Innovation Solution

A sulfonic acid based polymer resin covalently coupled with an amine based ligand via a sulfamide linkage is developed for the specific removal of cobalt derived radioactivity from aqueous solutions, utilizing a method that involves functionalizing a cation exchange resin with a chloride intermediate and reacting it with a multi-amine ligand to form a sequestration resin that irreversibly binds cobalt ions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional ion exchange resins are used for cobalt removal, then the resin can operate in aqueous solutions, but the removal efficiency is insufficient and transition metal hydroxide precipitates form within the pores

Engineering Contradiction:

Improvecobalt removal efficiencyVSAvoidtransition metal hydroxide precipitate formation

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent modifies the chemical parameters of the resin by changing from traditional ion exchange functional groups to amine-based ligands with specific coordination chemistry properties. This parameter change enables the resin to bind cobalt ions through coordination sequestration rather than ion exchange, preventing hydroxide precipitate formation while improving removal efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite resin structure by combining a polymeric support matrix with amine-based ligands that have specific coordination properties. This composite material integrates the mechanical stability of the polymer support with the selective cobalt-binding capability of the amine ligands, achieving both high removal efficiency and prevention of precipitate formation

Inventive Principle:

Principle #40Composite materials

2Reliability

If carboxylic acid based chelants are used, then transition metal cations can be removed, but the capacity is too strongly pH dependent and hydroxide precipitates form

Engineering Contradiction:

Improvetransition metal cation removalVSAvoidpH dependence of capacity

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the chemical nature of the ligand from carboxylic acid to amine-based groups. This parameter change fundamentally alters the pH dependence profile, as amine ligands maintain their binding capability across a broader pH range compared to carboxylic acid chelants, thereby improving adaptability to different pH conditions

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If polyamine intermediates are synthesized, then the ligand geometry can be tailored, but the synthesis process is complex and requires multiple steps

Engineering Contradiction:

Improveligand geometry tailoringVSAvoidsynthesis process complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the synthesis process into distinct functional modules: first synthesizing the polyamine ligand with tailored geometry, then coupling it to the polymer support. This segmentation allows independent optimization of ligand geometry and support properties, achieving adaptability while managing synthesis complexity through modular construction

Inventive Principle:

Principle #1Segmentation

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 new resin demonstrates a 3-fold improvement in cobalt removal efficiency compared to traditional ion exchange resins, reducing critical path downtime during reactor outages and minimizing radiation exposure by effectively depleting coolant of dose-causing radiocobalt before shutdown.

Implementation Method 1

achieve separation through coordination chemistry rather than ion exchange

Methodology Applied

Scientific EffectCoordination chemistry:

Implementation Method 2

synthesis of sequestration resins for water treatment in light water reactors

Methodology Applied

Scientific EffectSequestration:

Data Source

PatentUS8975340B2Synthesis of sequestration resins for water treatment in light water reactors

Publication Date: 2015.03.10 SAN JOSE STATE UNIV RES FOUND

AI summary

An organic synthesis of materials to achieve removal of low molecular weight ionic species, such as transition metal ions including cobalt, iron, nickel, and zinc, from aqueous solutions. The synthesis includes the steps of providing a cation exchange resin, functionalizing the cation exchange resin using a chloride intermediate to form a sulfonyl chloride resin, and reacting a multi-amine based ligand with the sulfonyl chloride resin to form a sequestration resin. The synthesis further includes the steps of cooling the sequestration resin, and washing and drying the sequestration resin.