Microporous Sorbent Selection for CO2 Separation
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Solution Overview
Problem
Current carbon capture and storage technologies face inefficiencies in separating carbon dioxide from methane and other gas mixtures, particularly in post-combustion capture and methane purification, where traditional acid gas removal processes are costly and not effective across a wide range of feed compositions.
Innovation Solution
The development of new methods for molecular separation using computational screening to identify optimal microporous materials like zeolites and metal-organic frameworks, considering both material geometry and process optimization, which prioritize cost-effectiveness and selectivity through metrics such as shape and size selectivity, and integrating these materials into pressure swing adsorption and vacuum swing adsorption processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional acid gas removal processes are used for carbon dioxide separation, then carbon capture can be achieved, but the process becomes costly and ineffective across a wide range of feed compositions
Solution Approach 1:
The patent changes the physical-chemical parameters of the separation process by transitioning from traditional acid gas removal (chemical absorption) to pressure swing adsorption using microporous materials. This parameter change enables the process to handle a wide range of feed compositions including flue gases, biogas, and natural gas with varying CO2 concentrations, thereby improving adaptability while maintaining capture effectiveness
Solution Approach 2:
The patent employs composite microporous materials combining zeolites and metal-organic frameworks (MOFs) with specific pore sizes and surface properties. These composite materials provide both high CO2 selectivity and adaptability to different feed compositions, resolving the contradiction between reliable carbon capture and versatility across various gas streams
2Measurement precision
If computational screening is used to identify optimal microporous materials, then material selection accuracy improves, but the process complexity increases
Solution Approach 1:
The patent develops a universal computational screening framework that simultaneously evaluates multiple material properties (pore size, surface area, CO2 selectivity, adsorption capacity) using standardized protocols. This multi-functional approach improves material selection accuracy while managing complexity through integration of various assessment criteria into a single systematic process
Solution Approach 2:
The patent focuses screening efforts on microporous materials with pore diameters of 0.3-1.0 nm, which are optimal for CO2 separation. This targeted approach to porous material selection improves accuracy by concentrating computational resources on the most promising material class while reducing overall process complexity through focused rather than exhaustive screening
3Productivity
If pressure swing adsorption and vacuum swing adsorption processes are implemented, then separation efficiency improves, but energy consumption increases
Solution Approach 1:
The patent implements periodic pressure swing adsorption cycles where adsorption occurs at high pressure followed by desorption at low pressure or vacuum. This periodic operation enables continuous high-efficiency separation while managing energy consumption through cyclic rather than continuous energy input, allowing the system to achieve high productivity with optimized energy usage
Solution Approach 2:
The patent utilizes phase transitions of CO2 between adsorbed and gas phases through pressure and vacuum swings. During adsorption, CO2 transitions from gas to adsorbed phase at high pressure; during desorption, it transitions back to gas phase at low pressure or vacuum. These phase transitions enable efficient separation while the cyclic nature manages energy requirements
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 approach enables more efficient and cost-effective capture and purification of carbon dioxide from flue gases and methane, achieving high purity and recovery rates while minimizing energy consumption and operational costs, applicable to various industrial sources.
Implementation Method 1
treating a mixture of molecules with a sorbent at a pressure of between about 0.5 to 15 bars; adsorbing carbon dioxide from the mixture of molecules
Implementation Method 2
considering both material geometry and process optimization, which prioritize cost-effectiveness and selectivity through metrics such as shape and size selectivity
Implementation Method 3
integrating these materials into pressure swing adsorption and vacuum swing adsorption processes
Implementation Method 4
integrating these materials into pressure swing adsorption and vacuum swing adsorption processes
Data Source
AI summary
Disclosed herein are new methods, machines, processes, and systems for separating molecules by determining better materials and process optimization conditions. As a result of these advances, this disclosure provides improved carbon dioxide capture, better flue gas treatments, and more efficient methods of purifying gases have been developed. Optimal sorbents can be obtained by using a computational screening method that selects microporous structures (e.g. zeolites and metal-organic frameworks) from a database of materials with the greatest potential for cost-effective separations. The disclosed methods are the first to consider both the size and shape of the adsorbent material. This is also the first disclosure to consider the process application and cost when selecting which material to use.