Gas Hydrate Brine Concentration for Lower-Energy Lithium Processing
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Solution Overview
Problem
Conventional lithium extraction from brines is carbon-intensive and inefficient, requiring high energy input and leading to significant carbon dioxide emissions.
Innovation Solution
A method involving the formation of gas hydrates with brine using gases like carbon dioxide at elevated pressure and reduced temperature, followed by depressurization to concentrate lithium brine, thereby reducing the need for heating utilities and lowering carbon emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional lithium extraction methods (adsorption, electrolysis, membrane-based extraction) are used, then lithium can be extracted from brine, but the process is carbon-intensive and requires high energy input
Solution Approach 1:
The patent utilizes gas hydrate formation and decomposition phase transitions to concentrate lithium from brine. Gas (e.g., CO2) is introduced under pressure to form solid gas hydrates with water, concentrating the brine. Subsequent pressure reduction decomposes the hydrates, releasing gas and leaving concentrated brine. This phase transition-based approach replaces energy-intensive conventional methods, reducing carbon emissions while maintaining extraction efficiency.
Solution Approach 2:
The process employs parameter changes in pressure and temperature to control gas hydrate formation and decomposition. By cycling pressure between high (formation) and low (decomposition) states, the system achieves lithium concentration without sustained high energy input. Temperature is also adjusted to optimize hydrate stability, enabling efficient lithium extraction with reduced energy consumption compared to conventional thermal or electrochemical methods.
2Productivity
If conventional lithium extraction methods are used, then lithium can be extracted from brine, but significant carbon dioxide emissions are generated
Solution Approach 1:
The patent converts carbon dioxide, a harmful greenhouse gas, into a useful reagent for lithium extraction. By using CO2 to form gas hydrates in the brine, the process both concentrates lithium and sequesters carbon dioxide temporarily in hydrate form. The CO2 is later released during hydrate decomposition and can be captured or utilized, transforming a harmful emission into a beneficial process input and reducing net carbon footprint.
3Use of energy by moving object
If gas hydrate formation is used to concentrate brine, then energy input is reduced, but the process requires elevated pressure and controlled temperature conditions
Solution Approach 1:
The patent employs pneumatic principles by using gas pressure directly to drive the hydrate formation process. Compressed gas (CO2 or other suitable gases) is introduced into the brine to induce hydrate formation, eliminating the need for complex mechanical compression systems. The gas pressure itself performs the work of concentrating the brine, simplifying the equipment required while maintaining low energy input. Temperature control is achieved through heat exchange with the surrounding environment or simple heat exchangers, further reducing system complexity.
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 process enhances lithium concentration efficiency, reduces carbon dioxide emissions, and minimizes the need for additional utilities, resulting in a more sustainable and intensified lithium production process.
Implementation Method 1
forming a gas hydrate with the water and the gas
Implementation Method 2
forming a gas hydrate with the water and the gas; concentrating the input brine, due to formation of the gas hydrate with the water
Implementation Method 3
lowering the pressure to less than 5 bar after formation of the gas hydrate
Implementation Method 4
decomposing the gas hydrate to form remaining water and remaining gas
Data Source
AI summary
Methods for concentrating brine comprising: introducing an input brine to a first hydrate column, wherein the input brine comprises a lithium ion and water; introducing an input gas to the input brine within the first hydrate column; forming a gas hydrate with the water and the gas; concentrating the input brine, due to formation of the gas hydrate with the water, to form a concentrated brine; and extracting, from the first hydrate column, the concentrated brine.