Direct-Air Carbon Capture Using Electrolytic Sodium Hydroxide
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Solution Overview
Problem
Conventional direct-air carbon capture processes require significant energy and suitable sorbent materials, limiting their scalability and effectiveness in reducing greenhouse gas emissions.
Innovation Solution
A direct-air carbon capture system that uses a renewable power source to generate chlorine, hydrogen, and a sodium hydroxide solution through electrolysis, which is then used to capture CO2 from air without the need for conventional sorbents, eliminating the requirement for fan energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional direct-air carbon capture processes use amine-based sorbent materials, then carbon dioxide can be captured from ambient air, but significant amounts of energy are required for the desorption process and fan energy is needed to direct air onto the sorbent material
Solution Approach 1:
The patent replaces the mechanical/chemical sorbent-based system with an electrolytic chemical process. Instead of using amine-based sorbent materials that require thermal desorption and fan-driven air flow, the invention uses electrolysis of sodium chloride solution to generate sodium hydroxide, which chemically reacts with carbon dioxide in a mixing chamber. This substitution eliminates the need for significant thermal energy and fan energy, directly resolving the energy consumption contradiction.
Solution Approach 2:
The patent changes the fundamental operating parameters from thermal/chemical sorption (requiring high temperature and pressure) to electrolytic chemistry (operating at ambient temperature and pressure). By using electrolysis to generate sodium hydroxide solution, which then reacts with CO2 in aqueous solution, the process achieves carbon capture at much lower energy inputs, transforming the energy parameter profile of the system.
2Productivity
If conventional direct-air carbon capture processes are implemented, then carbon dioxide removal from atmosphere can occur, but the facilities must be located at or near large sources of renewable energy, limiting broad implementation
Solution Approach 1:
The patent replaces the requirement for large-scale renewable energy sources (geothermal reservoirs, solar power plants, wind farms) with a distributed electrolysis system powered by any electrical energy source. The electrolytic process occurs in a compact chemical reactor that can be positioned anywhere, eliminating the location constraints imposed by the need for proximity to large renewable energy facilities. This enables broad implementation and enhances adaptability to various locations.
3Productivity
If conventional direct-air carbon capture processes are used, then carbon dioxide can be captured, but suitable sorbent materials are not readily available in the large quantities needed to remove millions of tons of carbon dioxide per year
Solution Approach 1:
The patent extracts and eliminates the dependency on rare amine-based sorbent materials from the carbon capture process. Instead of relying on the availability of specialized sorbents, the invention uses common sodium chloride (table salt) as the starting material, which is readily available in large quantities. The electrolysis process converts this abundant material into sodium hydroxide, providing an unlimited supply of reactive material for CO2 capture, thus resolving the sorbent availability constraint.
Solution Approach 2:
The patent changes the material parameter from rare amine-based sorbents to abundant sodium chloride. This parameter change fundamentally alters the supply chain requirements, transitioning from a system limited by the availability of specialized chemicals to one based on common, easily obtainable materials. The electrolytic conversion of NaCl to NaOH provides a scalable, unlimited supply of reactive material for industrial-scale CO2 capture.
4Productivity
If fan energy is used to direct ambient air onto sorbent material in conventional processes, then carbon dioxide can be exposed to the sorbent, but this additional energy requirement prevents the process from achieving negative greenhouse gas emissions
Solution Approach 1:
The patent replaces the mechanical fan-driven air flow system with a chemical reaction system. Instead of using fans to force ambient air through sorbent beds, the invention mixes CO2-containing air directly with sodium hydroxide solution in a mixing chamber, where the chemical reaction occurs in the liquid phase. This eliminates the need for mechanical air movement, removing fan energy consumption entirely and enabling negative greenhouse gas emissions.
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 system enables efficient and scalable direct-air carbon capture, achieving negative greenhouse gas emissions without the need for exotic sorbents or significant fan energy, thus enhancing the process's environmental impact.
Implementation Method 1
an electrolysis chamber that generates chlorine (CI), hydrogen (H), and an aqueous sodium hydroxide (NaOH) solution from a sodium chloride (NaCl) solution using electrical energy from the renewable power source
Implementation Method 2
a mixing chamber that generates an aqueous sodium bicarbonate (NaHCO3) solution by mixing CO2-containing air and the aqueous NaOH solution
Implementation Method 3
a CO2 extraction chamber that generates CO2 by combining the aqueous NaHCO3 solution with hydrogen chloride (HCl)
Data Source
AI summary
According to various embodiments, a carbon capture system includes: a renewable power source; an electrolysis chamber that generates chlorine (CI), hydrogen (H), and an aqueous sodium hydroxide (NaOH) solution from a sodium chloride (NaCl) solution using electrical energy from the renewable power source; a mixing chamber that generates an aqueous sodium bicarbonate (NaHCO3) solution by mixing CO2-containing air and the aqueous NaOH solution; and a CO2 extraction chamber that generates CO2 by combining the aqueous NaHCO3 solution with hydrogen chloride (HCl).