Lithium Ion Extraction via Phosphine Oxide Stripping
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Solution Overview
Problem
Current methods lack continuous closed-loop processes for the separation and removal of lithium ions from aqueous solutions with high ion purity and efficient regeneration of organic extracting solutions, making them cost-ineffective for both medium and large-scale production.
Innovation Solution
A continuous method involving mixing an aqueous feed solution with an organic solution containing a phosphine oxide and a proton donating agent under basic pH for lithium ion extraction, followed by stripping and recycling the organic solution to regenerate and purify the extracting phase, ensuring high lithium ion purity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If solvent extraction techniques are used to separate metal ions from aqueous solutions, then quantitative and selective extraction can be achieved, but the process lacks continuous closed-loop operation and efficient regeneration capability
Solution Approach 1:
The patent implements a continuous liquid-liquid extraction process where the organic extracting solution flows continuously through a column containing aqueous feed solution, enabling uninterrupted separation of lithium ions. The system maintains continuous operation with regenerative capability, eliminating batch processing interruptions and achieving both high ion purity (up to 99.999%) and sustained productivity through the closed-loop design where stripped organic solution is recycled back to the extraction stage.
2Reliability
If traditional extraction methods are used, then metal ion separation can be achieved, but the organic extracting solution cannot be efficiently regenerated, increasing costs
Solution Approach 1:
The patent employs a stripping stage where the organic solution loaded with lithium ions is treated with a stripping agent to remove and recover the lithium. The regenerated organic extracting solution is then recycled back to the extraction stage, eliminating the need for continuous purchase of fresh extracting solution. This recovery and reuse mechanism significantly reduces operational costs while maintaining reliable separation effectiveness through consistent quality of the regenerating organic phase.
3Measurement precision
If purification steps are added to elevate ion purity, then separation quality improves, but process complexity and cost increase
Solution Approach 1:
The patent achieves high ion purity (up to 99.999%) through a single continuous liquid-liquid extraction stage followed by a stripping stage, eliminating the need for multiple sequential purification steps. The selective extraction of lithium ions from the aqueous feed solution using the organic phosphine oxide-based extracting solution, combined with efficient stripping, accomplishes ultra-pure separation in one integrated process flow, thereby minimizing device and process complexity while maximizing purification effectiveness.
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 enables quantitative and selective removal of lithium ions with ionic purities up to 99.999% and regenerates the organic solution, making the process cost-effective for large-scale production.
Implementation Method 1
Mixing said aqueous feed solution with an extracting organic solution comprising at least one organic diluent, at least one phosphine oxide and at least one proton donating agent under basic pH, thereby extracting said Li ions into said organic solution
Implementation Method 2
Stripping said organic solution comprising extracted Li ions, thereby removing Li ions from said organic solution
Data Source
AI summary
Provided are continuous methods and processes for removing Li ions from an aqueous feed solution.