Non-aqueous Lithium Extraction via Polyethylenediimine Substrates
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Solution Overview
Problem
Current ion extraction methods, particularly for lithium, often rely on hazardous chemicals and are expensive, making them inefficient and costly for mining and environmental purification applications.
Innovation Solution
A method involving an ion capture substrate with polyethylenediimine or polymethylethylenediimine moieties covalently attached to an immobilization substrate, used in conjunction with an organic solvent like tetrahydrofuran, to selectively extract lithium ions from liquid sources, allowing for high extraction efficiency and substrate regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional chelating agents are used for lithium extraction, then extraction can occur, but hazardous chemicals are required and costs are high
Solution Approach 1:
The patent changes the chemical parameters by using polyethylenediimine and polymethylethylenediimine moieties instead of traditional hazardous chelating agents. These alternative compounds provide effective lithium extraction without the harmful properties of conventional reagents, thereby reducing both hazard levels and associated costs.
Solution Approach 2:
The ion capture substrate with polyethylenediimine or polymethylethylenediimine moieties is designed as a cost-effective alternative to expensive traditional chelating agents. The substrate can be regenerated and reused, providing an economical solution that reduces both initial cost and long-term operational expenses.
2Productivity
If lithium extraction is performed using conventional methods, then some extraction occurs, but extraction efficiency is low
Solution Approach 1:
The patent employs composite ion capture substrates containing polyethylenediimine or polymethylethylenediimine moieties combined with appropriate solvents. This composite approach enhances extraction efficiency by leveraging the synergistic effects of the polymeric structure and solvent properties, achieving greater than 90% lithium removal with consistent results.
3Productivity
If lithium extraction is performed in aqueous conditions, then extraction can proceed, but lithium's high affinity for water prevents effective extraction
Solution Approach 1:
The patent creates an inert non-aqueous environment by using organic solvents in conjunction with the ion capture substrate. This inert environment prevents water from interfering with the extraction process by eliminating water-lithium interactions, thereby enabling effective lithium extraction despite lithium's high natural affinity for water.
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 method achieves greater than 90% lithium ion extraction with selective removal, using non-aqueous conditions and organic solvents like THF, overcoming the challenges of lithium's high affinity for water and providing a cost-effective and environmentally friendly alternative to traditional chelating agents.
Implementation Method 1
contacting a liquid ion source comprising ions with an ion capture substrate in the presence of an organic solvent, wherein the ion capture substrate comprises a plurality of polyethylenediimine moieties or a plurality of polymethylethylenediimine moieties
Implementation Method 2
The organic solvent can be tetrahydrofuran. In some embodiments, the organic solvent can be a non-aqueous organic solvent.
Implementation Method 3
the step of regenerating comprise contacting the ion capture substrate with an acidic solution or a solution comprising a ligand having a greater affinity for an ion captured by the ion capture substrate than the ion capture substrate
Data Source
AI summary
Described herein are compositions for non-aqueous lithium ion extraction and methods of non-aqueous lithium ion extraction. In some embodiments, Octolig® or a methyl derivative thereof can be used to extract lithium and/or other ions from a non-aqueous substrate.