CO2 Absorbent Composition That Prevents Water Release and Blockage
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Solution Overview
Problem
Existing absorbents like sodium hydroxide and soda lime fail to achieve quantitative CO2 removal in gas streams without causing flow blockages, water discharge affecting downstream analysis, and require complex production or high drying agent consumption.
Innovation Solution
A mixture of sodium hydroxide, calcium hydroxide, and a molecular sieve is used, where the molecular sieve retains water without interfering with the CO2 reaction, maintaining the reaction equilibrium and preventing blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sodium hydroxide is used as an absorbent, then CO2 removal effectiveness is improved, but water is released which affects downstream analysis
Solution Approach 1:
The patent introduces calcium hydroxide as an intermediary substance that mediates between sodium hydroxide and the environment. The calcium hydroxide reacts with the water released by sodium hydroxide to form calcium carbonate and sodium hydroxide, effectively removing the harmful water byproduct while maintaining the CO2 absorption capability. This intermediary reaction solves the contradiction by converting the harmful water release into a useful regeneration process.
Solution Approach 2:
The patent implements a discarding and recovering mechanism where the water released during CO2 absorption is not simply discarded but is recovered and reused. The calcium hydroxide captures the water, and through the secondary reaction, sodium hydroxide is regenerated. This approach transforms the harmful water byproduct into a resource that extends the absorbent's service life and maintains analysis accuracy.
2Reliability
If pure sodium hydroxide is used, then CO2 absorption capacity is improved, but solid agglomerates form causing flow blockage
Solution Approach 1:
The patent creates a composite material system combining sodium hydroxide, calcium hydroxide, and a porous carrier. This composite structure prevents the formation of solid sodium carbonate agglomerates by providing a porous matrix that maintains gas flow pathways. The composite nature allows the system to maintain high CO2 absorption capacity while avoiding the flow blockage problem through the physical structure of the carrier material.
Solution Approach 2:
The patent employs a porous carrier material with specific pore size and distribution. This porous structure serves multiple functions: it supports the sodium hydroxide and calcium hydroxide, prevents dense agglomerate formation, and maintains gas flow channels. The porosity ensures that even as reactions proceed and materials transform, the gas stream can continue to flow through the absorbent bed without blockage.
3Duration of action of moving object
If soda lime mixture is used, then service life is extended through regeneration, but water discharge affects detector signal
Solution Approach 1:
The patent introduces a third intermediary component - the porous carrier material - that specifically addresses the water discharge problem. This carrier has controlled porosity and surface properties that prevent excessive water release while still allowing the regeneration reactions to proceed. The carrier acts as a buffer that moderates the water discharge, ensuring it does not reach levels that would interfere with detector signals while maintaining the service life extension benefit.
4Object-generated harmful factors
If quartz glass chips are added to prevent agglomerates, then flow blockage is reduced, but production complexity increases
Solution Approach 1:
The patent replaces the complex multi-component mixture of sodium hydroxide, calcium hydroxide, and quartz glass chips with a simpler porous carrier-based system. The porous carrier alone provides the structural framework that prevents agglomerate formation and maintains flow pathways. This simplification reduces production complexity while maintaining the same functional benefits of preventing flow blockage, as the porous structure inherently provides both support and flow channels.
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 mixture ensures long service life and reliable CO2 removal without altering the gas stream composition, reducing drying agent consumption and maintaining detector accuracy.
Implementation Method 1
Sodium hydroxide has sufficient reactivity with carbon dioxide to actually ensure quantitative removal
Implementation Method 2
the sodium carbonate resulting from the reaction of sodium hydroxide with carbon dioxide reacts with the calcium hydroxide. This reaction produces calcium carbonate. At the same time, the sodium hydroxide is regenerated
Implementation Method 3
the additional use of a desiccant ensures that the gas stream to be analyzed does not remove large quantities of water from the absorption of the carbon dioxide
Data Source
AI summary
The invention relates to a material for the quantitative removal of carbon dioxide from a gas stream. The material comprises a mixture of sodium hydroxide, calcium hydroxide and at least one drying agent, wherein the drying agent is a molecular sieve. The invention also extends to the use of this material in a suitable apparatus such as a gas analysis system.