Ceramic CO2 Absorbent Material for High-Temperature Regeneration
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Solution Overview
Problem
Current technologies for absorbing carbon dioxide, especially at high temperatures and in industrial settings, face inefficiencies and high costs due to material degradation and complex regeneration processes, limiting their effectiveness and scalability.
Innovation Solution
A ceramic material composed of a mixture of alkali carbonate and alkaline earth metal oxide/hydroxide, primarily magnesium or calcium, with a binding agent, which allows for efficient CO2 absorption above 300°C without cooling, using a simpler and cheaper production process, and can be regenerated at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional absorbent materials (ammonia with sodium oxide or potassium oxide) are used for CO2 absorption, then CO2 absorption capacity is achieved, but material degradation occurs at high temperatures and regeneration becomes complex and costly
Solution Approach 1:
The patent uses a composite material system consisting of calcium oxide or hydroxide combined with alkali metal carbonate (sodium carbonate, potassium carbonate, or their mixtures). This composite structure provides both high CO2 absorption capacity and thermal stability up to 300°C, while the regeneration process is simplified to a single heating step that decomposes the formed carbonate back to the original absorbent components.
Solution Approach 2:
The patent changes the chemical composition parameters of conventional absorbents by replacing ammonia-based systems with calcium oxide/hydroxide and alkali metal carbonate combinations. This parameter change enables the material to maintain stability at temperatures up to 300°C and simplifies the regeneration process by allowing direct thermal decomposition without complex multi-step procedures.
2Quantity of substance
If complex absorbent mixtures are used for CO2 absorption, then absorption capacity is improved, but production cost and process complexity increase
Solution Approach 1:
The patent creates a composite absorbent material combining calcium oxide or hydroxide with alkali metal carbonates in specific proportions (30-70% calcium compound, 20-50% alkali carbonate, 5-20% binder). This composite achieves high CO2 absorption capacity (above 45% of its mass) while maintaining production simplicity through straightforward mixing and shaping processes without requiring complex synthesis procedures.
3Use of energy by moving object
If high temperature CO2 absorption is performed without cooling, then energy efficiency is improved, but material stability becomes problematic
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating calcium oxide or hydroxide combined with alkali metal carbonates, which together provide exceptional thermal stability up to 300°C. This parameter change allows the material to maintain its compositional integrity during high-temperature absorption operations, enabling energy-efficient direct absorption without prior cooling of exhaust gases.
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 ceramic material achieves high CO2 absorption efficiency (above 45% of its mass) at elevated temperatures, with a simpler and more cost-effective production process, and can be regenerated efficiently, reducing energy costs and environmental impact.
Implementation Method 1
Ceramic material for the absorption of carbon dioxide
Implementation Method 2
alkali carbonate with alkaline earth metal oxide/hydroxide associated with a binding component
Implementation Method 3
processes for the regeneration of carbon dioxide and of the ceramic material
Data Source
AI summary
The present invention describes the process of preparing ceramic materials for absorption of acidic gases, mainly carbon dioxide, in exhaust systems and/or present indoors. Ceramic materials are formed by a mixture of alkali carbonate with alkaline earth metal oxide/hydroxide associated with a binding component, but non-limiting. The alkali carbonate comprises sodium, potassium carbonate, or a mixture of both. The alkaline earth metal oxide/hydroxide may be formed from magnesium oxide or magnesium hydroxide as well as calcium oxide and/or calcium hydroxide.