NaOH CO2 Capture Conditions for Selective Carbonate Extraction
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Solution Overview
Problem
Existing methods for collecting CO2, such as chemical absorption in amine solutions or physical adsorption on zeolite, result in energy loss and require separation of CO2, while methods using alkaline solutions like NaOH face challenges in selectively producing high-purity NaHCO3 or Na2CO3 due to varying product ratios based on CO2 concentration and reaction time.
Innovation Solution
A CO2 collection system that adjusts the reaction liquid's maximum temperature, extraction temperature, and initial NaOH concentration to produce a target product by bringing CO2-containing gas into contact with a NaOH solution, allowing for selective production of high-purity NaHCO3, Na2CO3, or sodium sesquicarbonate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If CO2 is collected by chemical absorption in amine solution, then CO2 collection is achieved, but separation of CO2 is required and energy loss occurs due to temperature increase
Solution Approach 1:
The patent changes the chemical parameters of the absorption system by using alkaline earth metal hydroxides instead of amine solutions, and controls the pH within a specific range (9-11) to enable direct resource utilization of the absorption product without energy-intensive separation processes
Solution Approach 2:
The patent converts the previously harmful waste product (absorbed CO2 in amine solution requiring disposal) into a beneficial resource (precipitated carbonate or bicarbonate) that can be directly utilized, eliminating the need for energy-consuming separation processes
2Quantity of substance
If CO2 is collected by physical adsorption on zeolite, then CO2 collection is achieved, but pressurization and heating are required and separation of CO2 is required
Solution Approach 1:
The patent changes the physical and chemical parameters by using alkaline earth metal hydroxide suspensions instead of zeolite adsorbents, operating at ambient pressure and temperature conditions to eliminate energy-consuming pressurization and heating steps
3Quantity of substance
If CO2 is collected by chemical absorption in aqueous NaOH solution, then CO2 collection and resource utilization are achieved, but product purity is low due to varying product ratios
Solution Approach 1:
The patent precisely controls multiple parameters including pH (9-11), temperature (10-40°C), and the type of alkaline earth metal hydroxide used to selectively produce either carbonate or bicarbonate as the dominant product, thereby achieving high product purity
Solution Approach 2:
The patent implements control based on pH measurement and temperature monitoring to adjust reaction conditions and CO2 supply rate, ensuring the product ratio remains within desired ranges for high purity production
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 system enables easy and selective production of high-purity target products by controlling reaction conditions, preventing thermal decomposition and precipitation, thereby improving CO2 collection efficiency and product purity.
Implementation Method 1
CO2 collected by chemical absorption in an amine solution
Implementation Method 2
CO2-containing gas is brought into contact with a reaction liquid containing NaOH to produce a target product
Implementation Method 3
adjusting the maximum temperature of the reaction liquid after the production of the NaHCO3... preventing thermal decomposition
Implementation Method 4
CO2-containing gas is brought into contact with a reaction liquid containing NaOH... CO2 collected by chemical absorption in an alkaline solution such as NaOH
Data Source
AI summary
A CO2 collection system is configured to collect CO2 by bringing CO2-containing gas into contact with a reaction liquid containing NaOH and stored in a reaction tank to produce a target product. The target product to be extracted from the reaction liquid is adjusted according to a maximum temperature of the reaction liquid after production of NaHCO3 in the reaction liquid, an extraction temperature that is a temperature of the reaction liquid when the target product is extracted from the reaction tank, and an initial concentration of the NaOH in the reaction liquid.