Lithium Silicate Sorbent Grain Growth Stabilization
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Solution Overview
Problem
Lithium silicate-based high-temperature dry sorbents for carbon dioxide capture degrade in carbon dioxide capture capacity over time due to grain growth, and existing methods have complex manufacturing processes and low regeneration efficiency.
Innovation Solution
A method involving the mixing of a lithium precursor, silicon oxide, and a metal oxide, such as aluminum or zirconium oxide, followed by drying and baking to form lithium silicate and metasilicate, which prevents agglomeration and allows for efficient carbon dioxide capture and regeneration at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium silicate is prepared by conventional methods, then carbon dioxide capture capacity is initially high, but capture capacity degrades over time due to grain growth
Solution Approach 1:
The patent applies preliminary action by adding aluminum oxide or aluminum compound to the lithium silicate before the grain growth occurs during regeneration. This preventive measure stabilizes the particle structure in advance, preventing the grain growth that would otherwise lead to capacity degradation over multiple regeneration cycles.
Solution Approach 2:
The patent creates a composite material system by combining lithium silicate with aluminum oxide or aluminum compound. This composite structure prevents the grain growth of lithium silicate particles during high-temperature regeneration, maintaining stable carbon dioxide capture capacity over time while utilizing the beneficial properties of both materials.
2Reliability
If conventional two-step manufacturing process is used, then sorbent performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the preparation of lithium silicate and the addition of aluminum oxide/aluminum compound into a single simultaneous process step. Instead of first preparing lithium silicate by baking lithium carbonate and silica, then separately adding aluminum compounds in a second step, both components are mixed and processed together in one baking operation, simplifying the manufacturing process while maintaining sorbent performance.
Solution Approach 2:
The patent makes the manufacturing process universal by using a single baking step that simultaneously achieves lithium silicate formation and aluminum compound incorporation. This multi-functional approach eliminates the need for separate preparation and modification steps, reducing manufacturing complexity while producing high-performance sorbent.
3Quantity of substance
If lithium silicate is used for carbon dioxide capture, then capture capacity is high, but capture rate is low
Solution Approach 1:
The patent changes the chemical composition parameters of the sorbent by incorporating aluminum oxide or aluminum compound alongside lithium silicate. This compositional modification creates active sites that enhance the carbon dioxide capture rate while preserving the high capture capacity of lithium silicate, effectively optimizing both kinetics and thermodynamics of the capture process.
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 method results in a sorbent with improved carbon dioxide capture capacity and regeneration properties, maintaining performance over multiple cycles and reducing energy consumption in the carbon dioxide capture process.
Implementation Method 1
preparing lithium silicate by baking (firing) lithium carbonate and silica at approximately 700° C.
Implementation Method 2
lithium silicate known as a dry carbon dioxide sorbent at a high temperature
Implementation Method 3
drying the mixed raw material
Data Source
AI summary
Provided are a method of manufacturing a lithium silicate-based high-temperature dry sorbent for removing carbon dioxide and a high-temperature dry sorbent. The manufacturing method includes forming a mixed raw material by mixing a lithium precursor, silicon oxide and a metal oxide, obtaining a lithium silicate solid by drying the mixed raw material, and baking the obtained lithium silicate solid.