Ionic Liquid Extraction of Tantalum from Acidic Aqueous Phases
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Solution Overview
Problem
Current methods for extracting tantalum from acidic aqueous phases, such as those from ore processing and waste recycling, face challenges due to the use of flammable and volatile solvents like MIBK, which pose safety and environmental hazards, and lack selectivity and efficiency in separating tantalum from other metals and impurities.
Innovation Solution
The process involves bringing the acidic aqueous phase into contact with an ionic liquid or a mixture of ionic liquids, which act as both solvents and extractants, providing a safer, more selective, and efficient means of extracting tantalum, with specific ionic liquids like bis(trifluoromethanesulfonyl)imides and functionalized variants being used to optimize the extraction process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIBK is used as extractant, then extraction efficiency is improved, but safety hazards increase due to high flammability and volatility
Solution Approach 1:
The patent changes the physical and chemical parameters of the extractant by replacing MIBK with ionic liquids that have fundamentally different properties: negligible vapor pressure, non-flammability, and high thermal stability. This parameter transformation resolves the contradiction by maintaining extraction efficiency while eliminating safety hazards associated with volatility and flammability.
Solution Approach 2:
The patent employs ionic liquids as reusable extractants that can be regenerated and reused multiple times, replacing the conventional approach of using volatile solvents that must be frequently replaced due to safety concerns and environmental regulations. This extends the operational lifetime of the extractant while improving safety.
2Device complexity
If conventional extractants are used, then extraction process is simpler, but selectivity for tantalum separation is insufficient
Solution Approach 1:
The patent introduces functional groups specifically designed for tantalum coordination at localized positions within the ionic liquid structure. The ionic liquid contains specific functional moieties (such as crown ethers, cryptands, or other chelating groups) that are positioned to selectively bind tantalum ions, providing local chemical environments that enhance selectivity without complicating the overall extraction process.
Solution Approach 2:
The patent creates composite ionic liquid extractants that combine multiple functional components within a single molecular structure. These composite ionic liquids integrate ion-pairing capabilities with specific chelating functional groups, creating a multifunctional extractant that achieves high selectivity for tantalum while maintaining the simplicity of a single-phase extraction system.
3Reliability
If ionic liquid is used as extractant, then safety and selectivity are improved, but extraction process complexity increases
Solution Approach 1:
The patent designs ionic liquids that perform multiple functions simultaneously: they serve as both the solvent medium and the extracting agent, eliminate the need for separate diluents, provide phase separation, and enable selective complexation. This multi-functionality reduces process complexity despite the advanced chemistry involved, as a single component replaces multiple conventional process elements.
4Temperature
If conventional solvents are used, then extraction can be performed at higher temperatures, but energy consumption increases
Solution Approach 1:
The patent changes the thermal parameters of the extraction system by using ionic liquids with high thermal stability that enable extraction at lower temperatures. The ionic liquids maintain their structural integrity and extracting capability at temperatures below 50°C, eliminating the need for high-temperature processing and thereby reducing energy consumption while improving safety.
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 high yield and selectivity for tantalum extraction while minimizing industrial and environmental safety risks, using a single phase that eliminates the need for additional solvents, and can be performed at lower temperatures, reducing energy costs.
Implementation Method 1
The process involves bringing the acidic aqueous phase into contact with an ionic liquid or a mixture of ionic liquids, which act as both solvents and extractants
Data Source
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AI summary
The invention relates to a process for extracting tantalum from an acid aqueous phase A1 comprising at least one step comprising the bringing of the aqueous phase A1 into contact with a phase A2 that is not miscible with water, then the separation of the aqueous phase A1 from the phase A2, the phase A2 being formed by an ionic liquid or a mixture of ionic liquids as extractant. The invention also relates to a process for recovering tantalum using this extraction process and also to a use of an ionic liquid or of a mixture of ionic liquids as extractant, for extracting the tantalum from such an aqueous phase A1.