Two-Stage Air Filter for Acid and Solvent Purging
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Solution Overview
Problem
Existing air filters using activated carbon granules are ineffective in purging acids from the air and require toxic additives, which reduce their efficiency in removing solvents and pose toxicity concerns.
Innovation Solution
A two-stage air filter design with an acid-purging stage featuring an air-permeable skeleton with sodium bicarbonate and a solvent-purging stage using activated carbon granules, allowing for effective neutralization and removal of both acids and solvents without toxic additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If acid-purging additives (rare earth metals, organic metal catalysts) are added to activated carbon granules, then acid purging capability is improved, but solvent purging efficiency deteriorates and toxicity increases
Solution Approach 1:
The filter is divided into two separate stages: a first stage for acid purging using a different mechanism, and a second stage for solvent purging using activated carbon. This segmentation allows each stage to be optimized for its specific function without the interference of incompatible additives, resolving the contradiction between acid purging capability and solvent purging efficiency.
Solution Approach 2:
The patent combines two different filtration mechanisms into a single filter system: acid-purging components (such as basic substances or chemical reactants) and solvent-purging activated carbon granules. This merging allows the system to achieve both acid and solvent purging capabilities simultaneously while maintaining the advantages of each component.
2Adaptability or versatility
If acid-purging additives are added to activated carbon granules, then acid purging capability is improved, but harmful factors increase due to toxic materials being released
Solution Approach 1:
By separating the acid purging function from the solvent purging function into different stages, the patent eliminates the need to use toxic additives in the activated carbon granules. The first stage can use benign acid-purging materials while the second stage uses pure activated carbon, thereby eliminating toxic material release.
Solution Approach 2:
The patent employs inexpensive, non-toxic acid-purging materials in the first stage that can be easily replaced when depleted, rather than using toxic catalysts that require careful handling and disposal. This approach prioritizes safety and eliminates toxic harmful factors.
3Adaptability or versatility
If acid-purging additives are added to activated carbon granules, then acid purging capability is improved, but filter capacity deteriorates due to reduced effective surface area
Solution Approach 1:
The filter capacity for acid and solvents is separated into two independent stages. The first stage handles acid purging with dedicated materials, while the second stage handles solvent purging with activated carbon. This segmentation preserves the full surface area and capacity of the activated carbon for solvent adsorption without dilution or blocking from acid-purging additives.
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 achieves high efficiency in purging both acids and solvents from the air, optimizing each stage independently without reducing the other's capacity and eliminating toxicity concerns.
Implementation Method 1
The acid-purging stage generally comprises an air-permeable skeleton having an acid-neutralizing substance mounted thereto
Implementation Method 2
the activated carbon granules are very effective in purging solvents from air
Data Source
AI summary
An air filter for purging unwanted substances from air which comprises a filtration media and at least one reactant attached to the filtration media. A method for purging unwanted substances from air which comprises providing an air filter comprising a filtration media and at least one reactant attached to the filtration media, and passing the air which is to be filtered through the air filter so as to purge unwanted substances from the air.