Substrate-Induced Nucleation for Low-Energy Seawater CO2 Extraction
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Solution Overview
Problem
Existing direct ocean capture (DOC) technologies for removing carbon dioxide from seawater are energy-intensive and costly, lacking efficient methods to reduce dissolved inorganic carbon concentrations while minimizing land use and addressing ocean acidification.
Innovation Solution
A substrate-induced nucleation process using structured templates on substrates to facilitate carbonate crystal formation, reducing energy consumption and enhancing carbon dioxide extraction efficiency in seawater, with systems like fluidized bed reactors and hollow fiber membrane contactors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional direct ocean capture technologies are used to remove carbon dioxide from seawater, then carbon dioxide removal capability is achieved, but energy consumption is high and operational costs are expensive
Solution Approach 1:
The patent changes the chemical parameters of the system by introducing a substrate that modifies the nucleation conditions for carbonate crystal formation. This substrate-induced nucleation allows the reaction to proceed at milder conditions with lower energy input compared to conventional methods, thereby reducing energy consumption while maintaining carbon dioxide removal capability
Solution Approach 2:
The substrate acts as an intermediary substance that facilitates the conversion of dissolved inorganic carbon to carbonate crystals. By providing a surface for nucleation, the substrate enables the reaction to occur more efficiently with lower energy requirements, thus resolving the contradiction between productivity and energy consumption
2Productivity
If conventional direct ocean capture technologies are used, then carbon dioxide removal is achieved, but operational costs are high
Solution Approach 1:
The substrate used in the patent appears to be a relatively simple material that can be easily manufactured and potentially replaced. By using an inexpensive substrate that facilitates nucleation, the operational costs are significantly reduced compared to conventional technologies that require expensive equipment and complex operations
Solution Approach 2:
By changing the chemical environment through substrate introduction, the process becomes more efficient and less costly to operate. The substrate-induced nucleation pathway has lower operational barriers and reduced costs compared to conventional thermal or chemical methods
3Productivity
If conventional methods are used to reduce dissolved inorganic carbon, then carbon dioxide extraction is achieved, but land use is high
Solution Approach 1:
The patent employs a fluidized bed reactor where the substrate particles are suspended in a fluid flow, allowing the process to occur in a compact three-dimensional space rather than requiring extensive land area. The hydraulic fluidization enables high extraction efficiency in a space-efficient configuration
Solution Approach 2:
By transitioning from a two-dimensional surface process to a three-dimensional fluidized bed system, the patent increases the effective reaction volume within a smaller footprint. This dimensional transition allows high productivity without proportionally increasing land use
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 process achieves efficient carbon dioxide extraction with reduced energy consumption, lowers the levelized cost, and mitigates ocean acidification by selectively removing DIC, allowing for offshore carbon storage and chemical synthesis.
Implementation Method 1
a substrate-induced nucleation process is performed on a surface of a substrate to produce processed seawater. The substrate-induced nucleation process transforms the dissolved inorganic carbon to carbonate crystal precipitates and carbon dioxide gas
Implementation Method 2
The substrate-induced nucleation process transforms the dissolved inorganic carbon to carbonate crystal precipitates and carbon dioxide gas
Implementation Method 3
The hollow fiber membranes have a CO2 selective permeability that allows the dissolved carbon dioxide gas from the processed seawater to be selectively transported
Data Source
AI summary
In a general aspect, carbon dioxide is extracted from seawater using substrate-induced nucleation. In certain aspects, a method of removing carbon dioxide from seawater includes receiving seawater and processing the seawater in the reactor. The reactor includes a substrate, and the seawater includes dissolved inorganic carbon. A substrate-induced nucleation process is performed on a surface of the substrate, during which the dissolved inorganic carbon is transformed to carbonate crystal precipitates and carbon dioxide gas. The method further includes extracting at least a portion of the carbon dioxide gas from the processed seawater.