Simulated Moving Bed Lithium Separation With Multiple Injection Points
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Solution Overview
Problem
Existing chromatographic separation processes for lithium from brines suffer from low productivity and inefficiency, particularly in the context of the energy transition, due to the limitations of single adsorption and desorption zones in simulated moving bed systems.
Innovation Solution
A process for lithium separation using a simulated moving bed with multiple columns connected in series and multiple injection and extraction points, allowing for the splitting of brine streams into multiple injection points and simultaneous recovery of lithium at multiple extraction points, enhancing the flow rate and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single adsorption zone and single desorption zone are used in simulated moving bed chromatography, then the process is simpler to operate, but productivity is low
Solution Approach 1:
The chromatography system is divided into multiple independent adsorption zones (at least two) and multiple desorption zones (at least two), with each zone having its own injection points and extraction points. This segmentation allows parallel processing of lithium separation operations, significantly increasing overall productivity while maintaining manageable system complexity through modular design
Solution Approach 2:
The system transitions from a single-zone sequential process to a multi-zone parallel process by adding spatial dimensions (multiple injection points and multiple extraction points distributed across different zones). This dimensional expansion enables simultaneous adsorption and desorption operations in different zones, resolving the contradiction between productivity and complexity
2Productivity
If brine is processed through a single injection point, then the system is easier to control, but the flow rate and productivity are limited
Solution Approach 1:
The single brine injection point is segmented into multiple injection points distributed across different adsorption zones. Each injection point can be independently controlled, allowing the system to process multiple brine streams simultaneously. This increases overall flow rate and productivity while maintaining operational simplicity through independent zone control
Solution Approach 2:
The multi-point injection system provides multi-functionality by enabling simultaneous processing of multiple brine streams with different flow rates or compositions. Each injection point serves the same function (brine introduction) but can be independently optimized, resolving the contradiction between productivity enhancement and operational simplicity
3Productivity
If traditional evaporation and crystallization methods are used for lithium extraction, then the process is simpler, but time consumption is high and lithium yield is low
Solution Approach 1:
The traditional mechanical evaporation and crystallization process is replaced with a chromatographic separation system using simulated moving bed technology. This substitution achieves faster lithium extraction with higher yield (over 95%) by using adsorption-desorption mechanisms instead of slow evaporation-crystallization, resolving the contradiction between productivity and process complexity
Solution Approach 2:
The separation mechanism is changed from relying on solubility parameters (evaporation-crystallization) to adsorption parameters (chromatography). By changing the fundamental separation parameter from concentration-based to affinity-based separation, the system achieves rapid high-yield lithium extraction while managing complexity through standardized chromatographic operations
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 improves lithium separation productivity while maintaining high purity and reducing eluent consumption, achieving higher yields and efficiency compared to traditional methods.
Implementation Method 1
lithium-specific adsorbents have been developed. They are based on microporous crystalline structures
Implementation Method 2
chromatographic separation process comprising a single column which is loaded and then unloaded
Data Source
AI summary
The present invention relates to a process for the chromatographic separation of lithium contained in a simulated moving bed brine, said a process comprising a step of fractioning the brine into at least two distinct streams, each of the brine streams being charged into each injection point of a simulated moving bed chromatography (SMB), then percolated, finally the lithium is recovered by means of at least two extraction points.