Multi-Granule Activated Carbon Filter for Humidity-Dependent Contaminant Removal
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Solution Overview
Problem
Existing air treatment filters require multiple types of activated carbon media to effectively remove various contaminants, leading to increased filter size and cost, particularly in small or portable systems, as individual modifications like potassium iodide, potassium hydroxide, and phosphoric acid enhance specific contaminant removal but fail to provide a holistic solution.
Innovation Solution
An activated carbon filter incorporating three types of granules: one supporting manganese dioxide and potassium hydroxide, another supporting potassium iodide and potassium hydroxide, and a third supporting phosphoric acid, allowing for comprehensive contaminant removal across varying humidity levels by catalyzing oxidation and chemisorption processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple types of activated carbon media are used to remove various contaminants, then contaminant removal effectiveness is improved, but filter size and cost increase
Solution Approach 1:
The patent combines multiple contaminant removal functions into a single activated carbon granule by supporting multiple catalysts (potassium iodide, potassium hydroxide, phosphoric acid) on the same carbon matrix. This merging approach allows the filter to remove various contaminants including formaldehyde, acidic gases, and alkaline gases without requiring multiple separate filter media types, thereby reducing filter volume while maintaining comprehensive contaminant removal effectiveness
Solution Approach 2:
The activated carbon granules are designed with multi-functionality by incorporating multiple catalysts that can handle different types of contaminants. The same granule can catalyze oxidation of formaldehyde, absorb acidic gases through potassium hydroxide, and remove alkaline gases through phosphoric acid, making the filter media universal and reducing the need for specialized separate filters for each contaminant type
2Reliability
If multiple types of activated carbon media are used to remove various contaminants, then contaminant removal effectiveness is improved, but filter cost increases
Solution Approach 1:
The patent combines multiple contaminant removal functions into a single activated carbon granule by supporting multiple catalysts (potassium iodide, potassium hydroxide, phosphoric acid) on the same carbon matrix. This merging approach allows the filter to remove various contaminants including formaldehyde, acidic gases, and alkaline gases without requiring multiple separate filter media types, thereby reducing filter volume while maintaining comprehensive contaminant removal effectiveness
Solution Approach 2:
The activated carbon granules are designed with multi-functionality by incorporating multiple catalysts that can handle different types of contaminants. The same granule can catalyze oxidation of formaldehyde, absorb acidic gases through potassium hydroxide, and remove alkaline gases through phosphoric acid, making the filter media universal and reducing the need for specialized separate filters for each contaminant type
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 filter effectively reduces contaminants like formaldehyde and other organic compounds across a range of humidity levels, reducing the total volume and cost of filter material while maintaining high efficiency, with the granule types working synergistically to remove multiple contaminants in a single filter.
Implementation Method 1
The first granule type is a primary catalyst for oxidation of contaminants, for example, formaldehyde, acetaldehyde, low molecular weight alcohols, low molecular weight aldehydes, low molecular weight carboxylic acids and other readily oxidized organic compounds, in a gas stream with a relative humidity of greater than about 5%, but less than about 30%
Implementation Method 2
catalyzing the oxidation of the at least one of formaldehyde, acetaldehyde, low molecular weight alcohols, low molecular weight aldehydes, low molecular weight carboxylic acids and other readily oxidized organic compounds
Implementation Method 3
the potassium hydroxide supported by the first and second granule types is a chemisorbant of the formic acid produced when formaldehyde is oxidized by those granule types
Implementation Method 4
The second granule type is a primary catalyst for oxidation of contaminants, for example, formaldehyde, acetaldehyde, low molecular weight alcohols, low molecular weight aldehydes, low molecular weight carboxylic acids and other readily oxidized organic compounds, in a gas stream with a relative humidity of greater than about 30%
Implementation Method 5
catalyzing the oxidation of the at least one of formaldehyde, acetaldehyde, low molecular weight alcohols, low molecular weight aldehydes, low molecular weight carboxylic acids and other readily oxidized organic compounds
Implementation Method 6
individual granules of activated carbon filter media have been modified to include phosphoric acid which is adapted to remove alkaline gases, for example, putriscine, indole, skatole, methyl amine, trimethyl amine, and pyridine, from the air stream
Data Source
AI summary
An activated carbon filter that treats a gas stream having a varying relative humidity, the gas stream contaminated with at least one of formaldehyde, an acid gas and an alkaline gas. The filter includes a plurality of activated carbon granules mixed together in a carbon bed filter. A first portion of the granules supports both manganese dioxide and potassium hydroxide. A second portion of the granules supports both potassium iodide and potassium hydroxide. A third portion of the granules supports phosphoric acid. The different portions operate to catalyze the oxidation of formaldehyde and other contaminants at varying humidity. The potassium hydroxide optionally chemisorbs any carboxylic acid by-products of the formaldehyde. Also provided is a method to treat a gas stream with the filter.