Sodium Hydroxide Direct Air Capture System
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Solution Overview
Problem
Conventional Direct Air Capture (DAC) methods require high heat energy to remove CO2 from calcium carbonate and produce CO2 as a byproduct, necessitating additional sequestration methods, making them inefficient and costly.
Innovation Solution
A DAC system using sodium hydroxide in a reaction chamber to capture CO2, producing sodium carbonate and water, followed by a closed-loop process with magnesium chloride to form magnesium carbonate, which is then purified and reused, with byproducts chlorine and hydrogen gases being repurposed through electrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If calcium hydroxide is used to capture CO2, then CO2 can be captured from ambient air, but high heat energy is required to remove CO2 from calcium carbonate and restore Ca(OH)2
Solution Approach 1:
The patent changes the chemical parameter from calcium hydroxide to sodium hydroxide, which fundamentally alters the capture chemistry. Sodium hydroxide reacts with CO2 to form sodium carbonate, eliminating the need for high-temperature calcination required in the calcium hydroxide system, thus reducing energy consumption while maintaining CO2 capture capability
Solution Approach 2:
The patent employs sodium hydroxide solution that can be easily replenished or regenerated, replacing the need for expensive and energy-intensive calcium carbonate processing. The sodium hydroxide absorbs CO2 efficiently and can be regenerated through simpler means, reducing overall system energy requirements
2Quantity of substance
If calcium hydroxide method is used, then CO2 can be captured, but CO2 must be sequestered via additional methods such as underground mineral injection
Solution Approach 1:
The patent converts the captured CO2 into sodium carbonate, which can then be reacted with magnesium chloride to form magnesium carbonate. This transforms the captured CO2 from a waste product requiring separate sequestration into a useful intermediate that forms stable, storable magnesium carbonate, eliminating the need for additional sequestration infrastructure
Solution Approach 2:
The patent merges the CO2 capture process with the carbonation process in a single integrated system. By combining the sodium hydroxide absorption step with the magnesium carbonate formation step, the system eliminates separate sequestration operations and creates a unified process that captures and stores CO2 simultaneously
3Quantity of substance
If conventional DAC methods are used, then CO2 can be captured, but the process is inefficient and costly
Solution Approach 1:
The patent changes the chemical parameters of the capture system by using sodium hydroxide instead of calcium hydroxide, and by optimizing the reaction conditions (temperature, concentration ratios). This parameter optimization increases the capture efficiency and reduces operational costs while maintaining high CO2 removal rates
Solution Approach 2:
The patent implements a continuous process where sodium hydroxide solution continuously absorbs CO2 from air, and the resulting sodium carbonate continuously reacts with magnesium chloride to form magnesium carbonate. This continuous operation eliminates idle time and maximizes capture efficiency throughout the process cycle
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 method achieves over 95% pure magnesium carbonate capture, reducing energy consumption and eliminating CO2 release, with a closed-loop system that funds further carbon capture through product sales, utilizing renewable energy and minimizing environmental impact.
Implementation Method 1
Carbon dioxide in the air moved through the reaction chamber interacts chemically with the sodium hydroxide, producing sodium carbonate and water
Implementation Method 2
a mechanism heating the sodium hydroxide. Also, in one embodiment the sodium hydroxide is heated to a temperature of about 49 degrees Celsius
Implementation Method 3
an air movement mechanism positioned to move air from outside through the reaction chamber, utilizing the air intake and the air exhaust openings
Implementation Method 4
removing sodium carbonate from the reaction chamber and mixing the sodium carbonate with soluble magnesium chloride, producing magnesium carbonate and sodium chloride brine in a slurry
Implementation Method 5
utilizing electrolysis to create sodium hydroxide in solution
Data Source
AI summary
A direct air capture (DAC) system for removal of carbon dioxide from ambient air has a reaction chamber having an air intake opening and an air exhaust opening, an air movement mechanism positioned to move air from outside through the reaction chamber, utilizing the air intake and the air exhaust openings, and a mechanism introducing sodium hydroxide into the reaction chamber. Carbon dioxide in the air moved through the reaction chamber interacts chemically with the sodium hydroxide, producing sodium carbonate and water.