Activated Carbon Fluidized Bed Oxidation Nitridation
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Solution Overview
Problem
Existing air purification systems using activated carbon face limitations in maintaining adsorption capacity, especially under humid conditions, and require effective regeneration methods to maintain efficiency.
Innovation Solution
A method involving a fluidized bed process where activated carbon particles are treated sequentially with oxygen, nitrogen or ammonia, and hydrogen gases at controlled temperatures and times to enhance their adsorption properties, including purging stages to optimize surface modification and hydrophobicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If activated carbon is used for air purification, then adsorption capacity for contaminants is improved, but susceptibility to humidity reduces effectiveness
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and surface properties of activated carbon through controlled oxidation and nitrogenation processes. These treatments alter the surface chemistry parameters to create hydrophobic characteristics while preserving adsorption capacity, directly resolving the contradiction between maintaining adsorption effectiveness and resisting humidity interference.
Solution Approach 2:
The patent creates a composite material structure by treating activated carbon with oxygen and nitrogen-containing gases to form a modified surface layer. This composite approach combines the high adsorption capacity of activated carbon with hydrophobic surface properties, enabling the material to maintain performance under humid conditions while preserving contaminant adsorption capability.
2Reliability
If activated carbon is regenerated using heat and clean air, then adsorption capacity is restored, but energy consumption and process complexity increase
Solution Approach 1:
The patent modifies the chemical structure of activated carbon through controlled oxidation and nitrogenation, creating a material that requires less energy for regeneration. The surface modifications enable effective contaminant removal at lower temperatures and reduce the energy intensity of the regeneration process while maintaining adsorption capacity restoration.
Solution Approach 2:
The patent replaces part of the thermal regeneration mechanism with chemical modification approaches. By pre-treating the activated carbon with oxygen and nitrogen gases to create favorable surface properties, the system reduces reliance on high-temperature thermal processes, thereby substituting some mechanical/thermal energy requirements with chemical pre-conditioning.
3Reliability
If multi-stage gas treatment process is applied to activated carbon, then adsorption performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the treatment process into distinct sequential stages: oxidation stage with oxygen-containing gas, nitrogenation stage with nitrogen-containing gas, and optional reduction stage with hydrogen. This segmentation allows each stage to perform a specific function (surface activation, hydrophobicity enhancement, and fine-tuning), achieving superior adsorption performance while maintaining manageable process complexity through clear stage separation.
Solution Approach 2:
The patent systematically changes multiple parameters including gas composition, temperature, pressure, and treatment duration across different stages. These controlled parameter variations enable precise optimization of surface properties at each stage, achieving enhanced adsorption performance through methodical parameter adjustment rather than uncontrolled complex processing.
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 enhanced activated carbon particles demonstrate improved adsorption capacity and reduced susceptibility to humidity, maintaining effectiveness in air treatment systems.
Implementation Method 1
a first heated gas comprising oxygen flows through a fluidized bed including particles comprising activated carbon to form oxidized activated carbon particles
Implementation Method 2
A second heated gas comprising nitrogen or ammonia flows through a fluidized bed including the oxidized activated carbon particles to form nitrogenated activated carbon particles
Implementation Method 3
A third heated gas comprising hydrogen flows through a fluidized bed including the nitrogenated activated carbon particles to form the enhanced activated carbon particles
Implementation Method 4
The highly porous surface of activated carbon can enable it to adsorb various airborne contaminants onto or into the surface of the activated carbon, thus removing the contaminants from the air
Data Source
AI summary
A method and system for making enhanced activated carbon are disclosed. A first heated gas including oxygen flows through a fluidized bed including particles comprising activated carbon to form oxidized activated carbon particles. A second heated gas including nitrogen, ammonia or a combination thereof, flows through a fluidized bed including the oxidized activated carbon particles to form nitrogenated activated carbon particles. A third heated gas including hydrogen flows through a fluidized bed including the nitrogenated activated carbon particles to form the enhanced activated carbon particles.