Deodorant Fiber Structure for Aldehyde Removal With Low Secondary Odor
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Solution Overview
Problem
Existing air filtration technologies, such as those using activated carbon and porous silica, face challenges in effectively removing aldehydes like acetaldehyde while minimizing secondary odor emissions, which can be triggered by changes in temperature and humidity.
Innovation Solution
A fiber structure is developed that incorporates inorganic particles and water-soluble amine compounds, with controlled water content and hydrophobic properties, to enhance adsorption efficiency and reduce physisorption and hygroscopicity, thereby minimizing secondary odor emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If activated carbon is used to remove aldehydes, then the surface area and pore volume are increased, but the equilibrium adsorption amount of acetaldehyde remains remarkably small and secondary odor emission occurs
Solution Approach 1:
The patent changes the chemical parameters of the adsorbent by using inorganic particles with specific surface treatments and controlling pH levels (3.5-7) to enhance acetaldehyde adsorption capacity while reducing non-specific physisorption of other odor components
Solution Approach 2:
The patent employs composite material structures combining inorganic particles with water-soluble amine compounds to achieve selective chemical adsorption of acetaldehyde while minimizing non-selective physisorption that causes secondary odor emission
2Quantity of substance
If porous silica is used to adsorb acetaldehyde, then the ability to remove acetaldehyde is improved, but strong hygroscopicity causes water-soluble odor components to be adsorbed and released, resulting in secondary odor emission
Solution Approach 1:
The patent controls the water content parameter of the fiber structure to 15% by mass or less by adjusting drying conditions and selecting hydrophobic inorganic particles, thereby reducing moisture-related adsorption and release of water-soluble odor components
Solution Approach 2:
The patent applies local quality control by treating inorganic particles with hydrophobic surface modifications in specific regions of the fiber structure to reduce hygroscopicity locally while maintaining acetaldehyde adsorption capability
3Quantity of substance
If amines are adhered to activated carbon to improve acetaldehyde removal, then the performance is enhanced, but substances other than acetaldehyde are adsorbed and concentrated, causing secondary odor emission
Solution Approach 1:
The patent optimizes pH parameters to 3.5-7 and controls water content to 15% by mass or less, creating conditions where chemical adsorption of acetaldehyde is enhanced while non-specific physisorption of other odor components is minimized
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 fiber structure demonstrates excellent reaction velocity and adsorption volume for aldehydes, with significantly reduced secondary odor emission risk, even under varying environmental conditions.
Implementation Method 1
inorganic particles and water-soluble amine compound are supported in a fiber structure
Implementation Method 2
unlike activated carbon, show extremely small physisorption
Implementation Method 3
the inorganic particles are hydrophobic porous particles
Data Source
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AI summary
This invention is to provide a fiber structure for deodorization which effectively removes aldehydes such as acetaldehyde etc. and has extremely small secondary odor emission risk. For that purpose, a fiber structure for deodorization, wherein inorganic particles and water-soluble amine compound are supported in a fiber structure, an equilibrated water content under the environment adjusted at a temperature of 25°C and a relative humidity of 75% is 15% by mass or less, and a pH when the fiber structure is immersed in water to 3% by weight relative to water is 3.5 to 7, is provided.