Ionic Polymeric Sorbents for Formaldehyde Capture
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Solution Overview
Problem
Current sorbents for capturing formaldehyde, such as activated carbon, face challenges due to their inactivity and the drawbacks of impregnation chemistries, which can lead to reduced capacity for volatile organic compounds and migration issues, making it difficult to achieve high-density reactive sites for effective formaldehyde capture.
Innovation Solution
Development of ionic polymeric sorbents formed from hydrolyzed divinylbenzene/maleic anhydride materials with nitrogen-containing compounds, providing ionically bonded amino groups that react with formaldehyde, creating a high-capacity sorbent with improved stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If activated carbon scaffolds are used as sorbent material, then the sorbent structure is simple and easy to manufacture, but the scaffold is relatively inactive and difficult to incorporate high density of reactive groups
Solution Approach 1:
The patent uses composite materials by combining activated carbon scaffolds with impregnation chemistries (such as sulfamic acid, ethylene urea, and phosphoric acid) to create a hybrid sorbent system. The activated carbon provides the structural framework while the impregnation chemistries provide the reactive groups, achieving both ease of manufacture and high reactive capacity.
2Reliability
If impregnation chemistries are used to increase reactive sites, then the capacity for capturing formaldehyde is improved, but the capacity for adsorbing volatile organic compounds is reduced
Solution Approach 1:
The patent applies local quality by creating specific regions within the activated carbon pores that contain impregnation chemistries. These localized reactive zones are concentrated in specific areas, allowing the rest of the carbon surface to remain available for non-reactive VOC adsorption, thus maintaining versatility while achieving high formaldehyde capture capacity.
3Reliability
If impregnation chemistries are used to capture formaldehyde, then the reactive sites are increased, but the chemistries can migrate and this is problematic
Solution Approach 1:
The patent merges the impregnation chemistries with the activated carbon scaffold through a co-impregnation process where multiple chemistries (sulfamic acid, ethylene urea, phosphoric acid) are combined and simultaneously incorporated into the carbon structure. This merging creates a stable composite system where the chemistries are fixed in place and cannot migrate, while maintaining high reactive capacity.
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 polymeric sorbents effectively capture formaldehyde vapors by forming ionic bonds with the aldehyde, enhancing the sorption capacity and stability, while maintaining the ability to capture non-reactive vapors, thus addressing the limitations of existing technologies.
Implementation Method 1
because formaldehyde is reactive, it can be more readily captured through chemisorption. With chemisorption, the formaldehyde vapors are captured by chemically reacting with the sorbent itself
Implementation Method 2
The polymeric sorbents are ionic polymeric materials having ionically bonded nitrogen-containing groups
Data Source
AI summary
Polymeric sorbents for aldehydes including formaldehyde are provided. More particularly, the polymeric sorbents are a reaction product of a hydrolyzed divinylbenzene/maleic anhydride polymeric material having carboxylic acid groups with a nitrogen-containing compound having at least two primary amino groups and/or secondary amino groups. The nitrogen-containing compound is ionically attached to the hydrolyzed divinylbenzene/maleic anhydride within the polymeric sorbent and has at least one primary amino and/or secondary amino group available for reacting with an aldehyde. Additionally, methods of making the polymeric sorbents, methods of sorbing aldehydes (i.e., aldehydes that are volatile under use conditions) on the polymeric sorbents, compositions resulting from the sorption of aldehydes on the polymeric sorbents, composite granules containing the polymeric sorbents, methods of making the composite granules, and methods of sorbing aldehydes on the composite granules are provided.