Polyphenol-Sulfonic Acid Filter for Aldehyde VOC Removal
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Solution Overview
Problem
Existing air filters are inadequate in effectively removing aldehyde-type VOCs, particularly formaldehyde, amine-type VOCs, ammonia, imines, and aminals from indoor air, which poses health risks due to their toxic, allergenic, and carcinogenic properties.
Innovation Solution
An air filter comprising a casing with compacted block elements made from a mixture of natural polyphenols, such as resveratrol and resorcinol, and a catalytic agent like solid sulfonic acid, which reacts irreversibly with aldehyde-type VOCs, thereby removing them from indoor air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional air filters using solid supported amine filtering medium are used, then some VOCs can be trapped, but they are inadequate in effectively removing aldehyde-type VOCs, particularly formaldehyde, amine-type VOCs, ammonia, imines, and aminals
Solution Approach 1:
The invention uses a composite filtering medium comprising polyphenolic substances (such as resveratrol, resorcinol, pyrogallol, phloroglucinol, or hydroquinone) combined with solid supported amine filtering medium. This composite structure enables the filter to effectively remove aldehyde-type VOCs through the polyphenolic-aldehyde reaction while maintaining the VOC-trapping capability of the amine medium, thereby resolving the inadequacy of conventional single-material filters
Solution Approach 2:
The invention changes the chemical state and reactivity parameters of the filtering medium by introducing polyphenolic substances that can undergo irreversible reaction with aldehydes. This chemical transformation enables the filter to target and remove specific aldehyde-type VOCs (formaldehyde, acetaldehyde, propionaldehyde, butyraldehyde, isobutyraldehyde, and their derivatives) that conventional filters cannot effectively remove
2Reliability
If polyphenolic substances and catalytic agent are mixed in compacted block elements, then aldehyde-type VOCs can be effectively removed, but the device complexity increases
Solution Approach 1:
The invention merges multiple functional components (polyphenolic substances, catalytic agents, and solid supported amine filtering medium) into a single integrated filtering medium. This combination allows the filter to simultaneously perform multiple functions: trapping VOCs through amine interaction and removing aldehydes through polyphenolic-aldehyde reaction, thereby achieving high removal efficiency without proportionally increasing device complexity
Solution Approach 2:
The invention applies different materials with specific local functions within the filtering medium structure. The polyphenolic substances are positioned to react with aldehydes, while the solid supported amine components are positioned to trap VOCs. This local differentiation of material properties enables each component to optimize its specific function while working together as an integrated system
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 air filter efficiently absorbs formaldehyde and other aldehyde-type VOCs at ppm concentrations, also trapping amine-type VOCs and ammonia, significantly reducing health hazards associated with indoor air pollution.
Implementation Method 1
The container includes a catalytic agent, and a mixture of the natural polyphenols and the catalytic agent is present in the container as compacted block elements
Implementation Method 2
one or more natural polyphenols...react with aldehyde-type VOCs, mainly formaldehyde
Data Source
AI summary
A filter and a method for removing aldehyde-type VOCs from indoor air are disclosed. The filter includes a casing acting as a container. The container comprises two air-permeable opposite walls through which a volume of said indoor air flows and houses one or more natural polyphenols and a catalytic agent. The filter acts as an absorption filter, reacting irreversibly with the aldehyde-type VOCs of the indoor air. The natural polyphenols are powdered polyphenols selected from resveratrol (3,4′,5-trihydroxystilbene), resorcinol (1,3-benzenediol), pyrogallol (1,2,3-benzenetriol), phloroglucinol (1,3,5-benzenetriol) and hydroquinone (1,4-benzenediol), or combinations thereof. The catalytic agent is a solid sulfonic acid. A mixture of the natural polyphenols and said catalytic agent are present, in the container, as compacted block elements. An air-purifying/decontaminating device comprising the filter is also disclosed.