Basic Gas Filter Coating for Ammonia Removal
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Solution Overview
Problem
Existing air filtration systems are inadequate in removing basic contaminants like ammonia at low concentrations, suffer from instability over time, are costly, and lack efficient mass transfer, making them unsuitable for precision manufacturing and other environments.
Innovation Solution
A basic gas filter system utilizing a substrate coated with a water-soluble polymer and organic phosphonic acid reactants, such as phytic acid and amino tris(methylene phosphonic acid), which captures and stabilizes ammonia, with a pH indicator for monitoring filter status and a thermal regeneration process to maintain performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional air filtration systems are used to remove basic contaminants, then some filtration is achieved, but the systems are inadequate at low concentrations, unstable over time, costly, and lack efficient mass transfer
Solution Approach 1:
The patent changes the chemical parameters of the filtration medium by using organic phosphonic acid reactants with specific functional groups (phosphonic, phosphinic, or carboxylic acid groups) that have high affinity for basic contaminants like ammonia. The coating composition parameters are optimized with specific weight ratios of stabilizer to organic phosphonic acid reactant (about 0.2:1) and controlled molecular weights (1 million to 10 million), creating a chemically active surface that dramatically improves ammonia removal capacity at low concentrations while maintaining long-term stability through the stabilizer component.
2Productivity
If existing filtration media are used, then basic gas removal is achieved, but mass transfer efficiency is poor and performance decays over time
Solution Approach 1:
The patent creates a composite coating material combining a stabilizer (water-soluble polymer with molecular weight 1 million to 10 million) and organic phosphonic acid reactant in a specific weight ratio of about 0.2:1. This composite structure provides dual functionality: the organic phosphonic acid reactant delivers high mass transfer efficiency through its chemically active functional groups that rapidly react with basic contaminants, while the stabilizer matrix provides structural integrity and long-term durability, preventing performance decay over time. The composite nature allows both high productivity and extended service life.
3Quantity of substance
If traditional filter coatings are applied, then some contaminant removal is achieved, but the coatings are unstable and performance degrades
Solution Approach 1:
The patent introduces a stabilizer as an intermediary component that mediates between the organic phosphonic acid reactant and the substrate. The stabilizer (water-soluble polymer with molecular weight 1 million to 10 million) acts as a binding matrix that anchors the chemically active organic phosphonic acid reactant to the substrate while maintaining its reactive functionality. This intermediary structure prevents the reactant from degrading or detaching, ensuring both high contaminant capture capacity and long-term coating stability. The stabilizer protects the active components while allowing them to perform their filtration function.
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 system achieves high-capacity ammonia removal at low concentrations, maintains performance over longer periods, reduces costs, and provides a lower carbon footprint, while the pH indicator ensures timely filter replacement, ensuring effective and efficient air purification.
Implementation Method 1
The coating includes a stabilizer and an organic phosphonic acid reactant... captures and stabilizes ammonia
Implementation Method 2
The coating includes a stabilizer and an organic phosphonic acid reactant... maintains performance over longer periods
Implementation Method 3
A color changing dye may be applied to indicator the life time and status of the media
Implementation Method 4
heating at least the coating to a temperature between about 125 °C to about 275 °C for about 1 minute to about 10 minutes
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 2C~2D
AI summary
An example article includes a substrate and a coating applied to the substrate. The coating includes a stabilizer and an organic phosphonic acid reactant. In an example article, the coating includes a water-soluble polymer and an organic phosphate or phosphonate reactant. An example coating configured to be applied to a basic gas filter substrate includes a water-soluble polymer and an organic phosphate or phosphonate reactant. An example technique includes applying a coating to a substrate and heating at least the coating to a temperature between about 100 °C and about 275 °C for about 1 minute to about 10 minutes. An example system includes a basic gas filter including a coating, and a sensor configured to sense an optical change in the coating.