Hydrogenated Cation Exchange Material for Lithium Extraction

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Solution Overview

Problem

Current methods for extracting lithium from brines are inefficient due to the need for multiple steps to remove impurities, and there is a limited variety of compounds available for lithium ion exchange processes.

Innovation Solution

A method using hydrogenated cation exchange materials that selectively bind and release lithium ions through reversible cation exchange with hydrogen ions, allowing for lithium extraction from solutions such as brines and seawater, utilizing materials like Li2MnO3, Li4TiO4, and Li4Ge5O12, which preferentially bind Li+ over H+ and Na+.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional multi-step separation processes are used to remove impurities from brine, then extraction reliability is improved, but device complexity and processing time increase

Engineering Contradiction:

Improveextraction reliabilityVSAvoidprocess complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges multiple separation functions into a single ion exchange material that simultaneously removes impurities and extracts lithium. The hydrogenated cation exchange material performs both impurity removal and lithium extraction in one integrated process, eliminating the need for separate sequential steps.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The ion exchange material serves multiple functions: it acts as both an impurity removal agent and a lithium extraction medium. The material's ability to selectively exchange cations allows it to handle both purification and concentration tasks that traditionally required separate specialized processes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If conventional multi-step separation processes are used to remove impurities from brine, then extraction reliability is improved, but processing time increases

Engineering Contradiction:

Improveextraction reliabilityVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The brine is pre-treated by adjusting pH to ensure optimal conditions for the ion exchange process. This preliminary adjustment prepares the solution for efficient single-step extraction, preventing the need for multiple corrective separation steps later in the process.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If limited variety of Li ion exchange compounds are used, then process simplicity is maintained, but adaptability to different brine compositions decreases

Engineering Contradiction:

Improveprocess simplicityVSAvoidadaptability to brine compositions

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent utilizes materials with adjustable parameters, particularly pH-responsive ion exchange materials. By changing the pH of the brine solution, the same material can selectively bind or release different cations, allowing adaptation to various brine compositions without changing the fundamental material system.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention employs composite ion exchange materials that combine multiple functional properties in a single system. These composite materials can simultaneously target multiple impurities and lithium ions, providing versatility across different brine types while maintaining a unified process approach.

Inventive Principle:

Principle #40Composite materials

4Productivity

If selective Li ion exchange is implemented, then productivity is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvelithium extraction efficiencyVSAvoidmaterial manufacturing complexity

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent uses pH as an intermediary control parameter to manage the ion exchange process. By adjusting pH, the material's selectivity and binding affinity are controlled without requiring complex manufacturing processes. This simple chemical parameter provides easy control over the selective extraction mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 efficient lithium recovery from diverse lithium concentrations, reducing the need for impurity removal steps and expanding the range of suitable ion exchange materials, thereby improving the extraction process.

Implementation Method 1

lithium cations undergo cation exchange with hydrogen in the hydrogenated cation exchange material to form a lithiated cation exchange material

Methodology Applied

Scientific EffectCation exchange: Ion Exchange

Implementation Method 2

hydrogen ions in the acidic solution undergo cation exchange with lithium ions of the lithiated cation exchange material, thereby regenerating the hydrogenated cation exchange material and releasing lithium ions into the acidic solution

Methodology Applied

Scientific EffectCation exchange: Ion Exchange

Data Source

PatentUS10322950B2Method for lithium extraction via ion exchange

Publication Date: 2019.06.18 NORTHWESTERN UNIV

AI summary

Methods for extracting lithium from solutions containing lithium ions via reversible cation exchange with H+ are provided. The methods utilize metal oxide or metalloid oxide cation exchange materials having an active sublattice that preferentially bind Li+ cations, relative to both H+ and Na+, in a sample solution and preferentially bind H+, relative to Li+, in an acidic solution.