Caustic Soda Synthesis for CO2 Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for reducing carbon dioxide emissions from combustion exhaust gas are economically inefficient, and existing carbon dioxide absorption technologies, such as those using electrolytic caustic soda, consume large amounts of energy and generate significant carbon dioxide emissions.
Innovation Solution
A method involving the synthesis of caustic soda using natural sodium carbonate ore through a causticization reaction with slaked lime, followed by a recycling process that utilizes the synthetic caustic soda to absorb carbon dioxide from combustion exhaust gas, converting it into synthetic sodium carbonate and sodium bicarbonate products, thereby reducing emissions and promoting resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrolytic caustic soda is used as carbon dioxide absorbing liquid, then carbon dioxide absorption efficiency is improved, but energy consumption increases and carbon dioxide emissions increase
Solution Approach 1:
The patent changes the source of caustic soda from electrolytic production to chemical synthesis using natural sodium carbonate ore and slaked lime. This parameter change in the production method reduces energy consumption and associated carbon dioxide emissions while maintaining the effectiveness of caustic soda as a carbon dioxide absorbing liquid.
Solution Approach 2:
The patent implements a self-service system where the treated liquid containing sodium carbonate is recycled back to the caustic soda synthesis step. This creates a closed-loop system where the output of the absorption process becomes the input for caustic soda regeneration, reducing the need for continuous external caustic soda supply and minimizing waste.
2Object-generated harmful factors
If carbon dioxide is absorbed using caustic soda aqueous solution, then carbon dioxide emission is reduced, but treatment cost increases
Solution Approach 1:
Instead of discarding the treated liquid containing sodium carbonate, the patent recovers and recycles it back to the caustic soda synthesis step. This recovery approach transforms waste into a useful resource, reducing treatment costs by eliminating the need for continuous purchase of fresh caustic soda while maintaining carbon dioxide emission reduction effectiveness.
Solution Approach 2:
The patent converts the treated liquid, which would normally be considered waste or harmful discharge, into a beneficial resource by recycling it as raw material for caustic soda synthesis. This transforms a potential environmental burden into an economic advantage, reducing both treatment costs and carbon footprint.
3Quantity of substance
If natural sodium carbonate ore is used as raw material, then resource efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the manufacturing process into distinct steps: caustic soda synthesis from natural sodium carbonate ore, carbon dioxide absorption, and treated liquid recycling. This segmentation allows each step to be optimized independently, managing complexity while maximizing resource efficiency through the use of natural ore materials.
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 effectively reduces carbon dioxide emissions while producing sodium carbonate and sodium bicarbonate products, achieving economic and environmental benefits by minimizing energy consumption and waste, and allowing for continuous operation with on-site caustic soda synthesis and recycling.
Implementation Method 1
a caustic soda synthesis step of generating synthetic caustic soda aqueous solution and calcium carbonate precipitate by a causticization reaction with slaked lime
Implementation Method 2
the synthetic caustic soda aqueous solution and purified combustion exhaust gas are brought into gas-liquid contact so that carbon dioxide in the exhaust gas is reduced by being absorbed by the synthetic caustic soda aqueous solution
Implementation Method 3
the synthetic sodium carbonate aqueous solution...is regenerated into the caustic soda aqueous solution in the caustic soda synthesis step
Data Source
AI summary
A treatment method for reducing carbon dioxide emission of combustion exhaust gas includes: a caustic soda synthesis step; a treatment step of reducing carbon dioxide emission of combustion exhaust gas; and a recycling step. In the caustic soda synthesis step, a natural sodium carbonate aqueous solution (Na2CO3) prepared by dissolving natural sodium carbonate ore powder composed of Na2CO3 and NaHCO3 in a caustic soda aqueous solution is used to generate a caustic soda aqueous solution and calcium carbonate precipitate by a causticization reaction with slaked lime, and solid-liquid separation is performed to obtain a synthetic caustic soda aqueous solution. In the treatment step, the synthetic caustic soda aqueous solution and purified combustion exhaust gas are brought into gas-liquid countercurrent contact so that carbon dioxide in the exhaust gas is absorbed by the synthetic caustic soda aqueous solution and immobilized as sodium carbonate.