Diffusive Sorbent Air Purifier for Formaldehyde Removal
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Solution Overview
Problem
Current air purifiers are expensive, unreliable, and ineffective in removing common indoor air pollutants like formaldehyde, vinyl chloride, and nitrogen dioxide, with no reasonably priced, validated options available.
Innovation Solution
A diffusive air purifier using a chemical sorbent within a permeable container, employing a chemical reaction to immobilize specific air pollutants, with a manufacturing process involving impregnation of a porous solid with a sorbent precursor and a binding agent, and a method to detect pollutant concentration for targeted adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commercial air purifiers are used to remove dangerous chemicals like formaldehyde, vinyl chloride, or nitrogen dioxide, then air purification effectiveness is improved, but cost increases significantly to $500-$1500
Solution Approach 1:
The patent employs disposable sorbent cartridges that can be easily replaced, eliminating the need for expensive commercial air purifiers. The sorbent material is designed to be consumed and replaced rather than regenerated, providing cost-effective air purification for common indoor pollutants.
Solution Approach 2:
The invention changes the approach by using chemical sorbents with specific affinities for particular pollutants rather than attempting to remove all contaminants. This targeted parameter change allows for more effective removal of specific dangerous chemicals at lower cost.
2Reliability
If existing air purifiers are used, then some air purification function is provided, but validation proves they may not serve their intended purpose
Solution Approach 1:
The patent incorporates validation studies and measurable performance data to verify the sorbent's effectiveness in removing specific pollutants. This feedback mechanism ensures the air purifier actually serves its intended purpose rather than just claiming to do so.
Solution Approach 2:
The invention replaces unvalidated mechanical filtration systems with chemically-based sorption mechanisms that have known and measurable effectiveness. The chemical reaction between sorbent and pollutant provides a more reliable and verifiable purification mechanism.
3Ease of manufacture
If a diffusive air purifier with chemical sorbent is used, then cost is reduced and effectiveness is improved, but device complexity increases due to validation and manufacturing requirements
Solution Approach 1:
The patent uses porous sorbent materials that provide high surface area for chemical reactions. This material choice simplifies the overall device structure while maintaining high effectiveness, as the porous structure naturally provides the necessary reaction surface without requiring complex additional components.
Solution Approach 2:
The invention employs composite sorbent materials combining multiple functional properties in a single material system. This reduces the need for multiple separate components and simplifies both manufacturing and device structure while maintaining validation-proven effectiveness.
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
Effectively removes specific air pollutants at low cost, proven through validation studies, and provides a predictable lifetime with a colorimetric indicator for filter replacement, ensuring safe and efficient indoor air purification.
Implementation Method 1
a chemical sorbent or a precursor thereof contained within the permeable container, said chemical sorbent having a chemical composition selected to achieve removal of a predetermined air pollutant via a chemical reaction that renders the predetermined air pollutant immobile
Implementation Method 2
the diffusive air purifier is operative to adsorb a predetermined mass of the airborne chemical per a mass of chemical sorbent contained within the diffusive air purifier
Implementation Method 3
a diffusive air purifier comprises an air permeable container and a chemical sorbent or a precursor thereof contained within the permeable container
Data Source
AI summary
A diffusive air purifier includes an air permeable container containing a chemical sorbent or a sorbent precursor. The sorbent has a chemical composition selected to achieve removal of an air pollutant via a chemical reaction that renders the predetermined air pollutant immobile. A method of manufacturing the diffusive air purifier includes impregnating a porous solid with a solution of sorbent precursor and a binding agent and drying the porous solid. A method of purifying indoor air includes detecting a measured concentration of an airborne chemical in an enclosed location; selecting the diffusive air purifier to adsorb the airborne chemical; and placing the diffusive air purifier in the enclosed location. Air diffuses through the outer container and into the sorbent where the chemical to be removed is retained. Air, free of the target chemical, diffuses out of the container and the process repeats.