Activated Carbon Adsorbent for Hydrogen Purification
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Solution Overview
Problem
PSA systems face challenges in efficiently purifying hydrogen from feed streams with low hydrogen content, typically below 80 volume percent, requiring large adsorbent beds and resulting in high capital and operational costs.
Innovation Solution
The development of adsorbent materials and systems with optimized activated carbon layers, characterized by specific surface area, total open pore volume to surface area ratio, and bulk density, which are configured to improve the efficiency of hydrogen purification in PSA systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSA systems use large beds of adsorbent material to purify low hydrogen content feed streams, then hydrogen purification capability is improved, but capital cost and operational cost increase
Solution Approach 1:
The patent changes the physical parameters of the adsorbent material by using activated carbon with specific pore size distributions (micro pores 0.3-2.0 nm, meso pores 2.0-50 nm) and controlled surface area (300-1000 m2/g). This parameter optimization allows the adsorbent to achieve high purification capability with reduced bed size, directly resolving the contradiction between purification reliability and device complexity.
Solution Approach 2:
The patent employs composite adsorbent materials combining activated carbon with specific pore structures and surface properties. The composite structure enables simultaneous adsorption of multiple impurities (CO2, CH4, N2, CO) while maintaining high hydrogen productivity, thereby reducing the required adsorber size while preserving purification capability.
2Reliability
If PSA systems use large beds of adsorbent material to purify low hydrogen content feed streams, then hydrogen purification capability is improved, but equipment capital cost increases
Solution Approach 1:
By optimizing the physical parameters of activated carbon (pore size distribution, surface area, bulk density), the patent achieves enhanced adsorption efficiency that reduces the volume of adsorbent material needed. This parameter optimization directly lowers equipment capital cost while maintaining purification reliability.
Solution Approach 2:
The patent utilizes porous activated carbon materials with specifically controlled pore structures (micro and meso pores) to maximize adsorption capacity within a smaller volume. The porous structure provides high surface area to volume ratio, enabling effective purification with reduced equipment size and lower capital costs.
3Reliability
If PSA systems use large beds of adsorbent material to purify low hydrogen content feed streams, then hydrogen purification capability is improved, but hydrogen recovery decreases
Solution Approach 1:
The patent optimizes adsorbent parameters including pore size distribution (micro pores 0.3-2.0 nm, meso pores 2.0-50 nm) and surface area (300-1000 m2/g) to enhance selective adsorption of impurities. This parameter optimization improves hydrogen recovery by preventing hydrogen adsorption while maintaining effective impurity removal, thereby resolving the contradiction between purification capability and hydrogen recovery.
Solution Approach 2:
The patent applies local quality by creating zones with different adsorbent characteristics within the bed. The activated carbon layer has specifically controlled pore structures that provide high affinity for impurities while maintaining low affinity for hydrogen. This local optimization ensures high hydrogen recovery throughout the bed while achieving effective purification.
4Adaptability or versatility
If PSA systems are designed for low hydrogen content feeds, then design flexibility is improved, but adsorber sizing becomes more difficult
Solution Approach 1:
The patent provides design flexibility for low hydrogen content feeds by optimizing adsorbent parameters (pore size, surface area, bulk density) that can be adjusted for different feed compositions. The activated carbon with controlled physical properties enables scalable adsorber sizing while maintaining effectiveness across varying hydrogen content feeds, resolving the contradiction between adaptability and device complexity.
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
This solution enables the reduction of adsorber sizing, enhances hydrogen recovery, and decreases fuel consumption and carbon dioxide emissions, making hydrogen purification more cost-effective and environmentally friendly.
Implementation Method 1
a bed of adsorbent material... an activated carbon layer including activated carbon... configured to improve the efficiency of hydrogen purification in PSA systems
Data Source
AI summary
An adsorption system having at least one adsorber retaining a bed of adsorbent material can be configured to provide enhanced purification of fees having relatively low concentrations of hydrogen or helium. Embodiments can utilize an activated carbon layer between at least one upstream layer and at least one downstream layer. The activate carbon layer can include activated carbon can have a pre-selected surface area (SA), bulk density, total open pore volume (TOPV), and/or ratio of TOPV to surface area (TOPV/SA).