Core-Shell Nitrogen Adsorbents for Gas Separation
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Solution Overview
Problem
Current gas separation technologies, particularly those using zeolite adsorbents, face limitations in achieving a combination of high adsorption capacity, selectivity, and adjustable hydrophobicity, which are essential for effectively removing contaminants like H2S, CO2, and noble gases from gas streams while maintaining methane recovery and ensuring environmental safety.
Innovation Solution
Development of non-metallic porous organic compositions with a core-shell configuration, where the core and shell are composed of nitrogen-containing molecules that are non-chemically bonded, offering improved selectivity, capacity, and hydrophobicity, enabling efficient gas separation through processes like pressure swing adsorption and temperature swing adsorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zeolite adsorbents are used for gas separation, then adsorption capacity and selectivity can be achieved, but hydrophobicity is not adjustable and surface properties are limited
Solution Approach 1:
The invention uses composite materials by combining a porous core material with a shell formed from nitrogen-containing molecules. This composite structure allows the core to provide adsorption capacity and selectivity while the shell provides adjustable hydrophobicity, resolving the contradiction between reliable adsorption performance and adaptable surface properties.
Solution Approach 2:
The invention applies local quality by having different regions of the adsorbent particle serve different functions: the core region provides adsorption capacity and selectivity, while the shell region provides hydrophobicity. This spatial differentiation allows each region to optimize its specific function without compromising the other.
2Reliability
If conventional adsorbent materials are used, then gas separation can be performed, but a combination of high capacity, selectivity, and adjustable hydrophobicity cannot be achieved
Solution Approach 1:
The patent creates a composite adsorbent where the core-shell structure combines materials with complementary properties. The core provides high adsorption capacity and selectivity, while the nitrogen-containing shell provides adjustable hydrophobicity, achieving a combination of properties that cannot be obtained with conventional single-material adsorbents.
Solution Approach 2:
The invention enables parameter changes by allowing the hydrophobicity of the adsorbent to be adjusted through the selection and modification of nitrogen-containing molecules in the shell. This provides tunable adsorption behavior that adapts to different gas separation requirements while maintaining high capacity and selectivity.
3Productivity
If methane recovery is increased to improve process economics, then more methane can be recovered, but effective separation from contaminants requires superior selectivity
Solution Approach 1:
The core-shell structure applies local quality by concentrating selectivity functions in the shell region while the core provides capacity. This allows the adsorbent to achieve both high methane recovery (productivity) and effective contaminant separation (selectivity) simultaneously, as each region optimizes its specific contribution to the separation process.
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 core-shell compositions enhance the separation efficiency of gases by providing superior adsorption capacity and selectivity, allowing for higher methane recovery and effective removal of contaminants, while also offering adjustable hydrophobicity for various gas streams, thus improving process economics and environmental safety.
Implementation Method 1
Adsorptive gas separation techniques are common in various industries using solid sorbent materials such as activated charcoal or a porous solid oxide such as alumina, silica-alumina, silica, or a crystalline zeolite. Adsorptive separation may be achieved by equilibrium or kinetic mechanisms.
Implementation Method 2
Kinetically based separation involves differences in the diffusion rates of different components of the gas mixture and allows different species to be separated regardless of similar equilibrium adsorption parameters.
Implementation Method 3
the zeolite adsorbents may not have desirable surface properties, such as suitable hydrophobicity
Data Source
AI summary
Porous organic compositions including a core comprising nitrogen-containing molecules and a shell comprising nitrogen-containing compounds wherein the shell is non-chemically bonded to the core are provided herein. Processes for making the porous organic compositions as well as gas separation processes using the porous organic compositions are also provided herein.