Acetoacetate Polymer Coated Filter for Permanent Aldehyde Removal
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Solution Overview
Problem
Current air filtration technologies are inadequate for effectively and permanently removing gaseous aldehydes like formaldehyde and acetaldehyde from indoor air and tobacco smoke, as they often rely on physical adsorption rather than chemical reaction, and existing materials can be hazardous or ineffective in maintaining the removal over time.
Innovation Solution
A filter support material coated with a polymeric composition containing acetoacetate residues and a metallic oxidizing agent or oxidation catalyst, selected from condensation polymers, addition polymers, epoxy resins, polysiloxanes, cellulose, and cellulose esters, which chemically reacts with aldehydes to form stable bonds, ensuring permanent removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical adsorption is used to remove formaldehyde, then the filter structure is simple and cost-effective, but the removal is not permanent and effectiveness decreases over time
Solution Approach 1:
The patent uses a composite material consisting of a porous support filter coated with a polymeric amine layer. This composite structure combines the mechanical support function of the porous substrate with the chemical reactivity of the polymeric amine coating, enabling permanent chemical removal of formaldehyde while maintaining filter structural integrity
Solution Approach 2:
The patent modifies the chemical parameters of the filter by coating it with a polymeric amine, transforming it from a purely physical adsorption medium to a chemical reaction medium. This parameter change enables the filter to permanently remove formaldehyde through chemical bonding rather than temporary physical adsorption
2Reliability
If polymeric amine coating is used to chemically react with formaldehyde, then permanent removal is achieved, but the amine is consumed by carbon dioxide in air reducing effectiveness
Solution Approach 1:
The patent applies local quality by creating a specialized coating layer with specific chemical properties on the surface of the porous support. The polymeric amine coating is localized on the filter surface where it can selectively react with aldehydes passing through the filter, while the bulk support structure remains inert and unaffected by carbon dioxide
Solution Approach 2:
The patent converts the potential harm of polymeric amine consumption by carbon dioxide into a benefit by designing a system where the coating is applied in such a way that aldehyde removal is the primary and dominant reaction. The coating's reactivity with carbon dioxide is minimized through proper formulation and application, allowing the filter to maintain effectiveness over extended service periods
3Reliability
If strong oxidizing agents are used to treat fibers, then aldehyde removal capability is enhanced, but the treated fibers become hazardous to handle
Solution Approach 1:
The patent changes the chemical parameters by using a polymeric amine coating instead of treating the fiber bulk with strong oxidizing agents. This parameter change allows the filter to achieve aldehyde removal capability through a safer chemical mechanism that does not require hazardous materials
Solution Approach 2:
The patent introduces a polymeric amine coating as an intermediary layer between the air stream and the fiber support. This intermediary coating provides the chemical reactivity needed for aldehyde removal without requiring the fibers themselves to be treated with hazardous strong oxidizing agents, thus eliminating handling hazards while maintaining removal capability
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 solution provides a lightweight, cost-effective, and safe filter medium that chemically reacts with aldehydes, offering efficient and permanent removal of formaldehyde and other gaseous pollutants from air and tobacco smoke, maintaining effectiveness over time without the hazards associated with previous technologies.
Implementation Method 1
a polymeric composition containing acetoacetate residues and a metallic oxidizing agent or oxidation catalyst
Implementation Method 2
chemically reacts with aldehydes to form stable bonds, ensuring permanent removal
Data Source
AI summary
Disclosed are filter elements constructed of a filter support material coated with an acetoacetate-functional polymeric composition that reacts with and removes aldehydes, especially formaldehyde, present in gases such as air. Also disclosed are methods for the removal of aldehydes utilizing the coated filter support materials.