Amine Alkaline CO2 Absorption for Low-Temperature Desorption
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Solution Overview
Problem
Existing carbon dioxide recovery methods require significant thermal or electrical energy, making them costly and inefficient for large-scale carbon dioxide treatment.
Innovation Solution
A carbon dioxide treatment method involving an absorption step with an alkaline aqueous solution containing an amine compound, a desorption step at 50 to 100°C, and an optional electrolysis step to recover carbon dioxide with reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat treatment at 120°C or higher is used to desorb carbon dioxide from carbamate ions, then carbon dioxide can be recovered, but large thermal energy is required and treatment cost increases
Solution Approach 1:
The patent changes the temperature parameter from conventional 120°C or higher to a lower range of 50-100°C by modifying the chemical environment. Specifically, it adjusts the amine compound concentration (5-30 wt%) and pH value (8-12) of the alkaline aqueous solution to create conditions where carbon dioxide can be desorbed at lower temperatures while maintaining recovery efficiency.
Solution Approach 2:
The patent uses a composite alkaline aqueous solution containing both amine compounds and alkali metal hydroxides. This composite composition enables the system to achieve effective carbon dioxide desorption at lower temperatures by combining the chemical properties of both components, reducing the thermal energy requirement compared to using amine compounds alone.
2Object-generated harmful factors
If electrical energy is used for electrolysis treatment to denature carbon dioxide, then carbon dioxide can be converted to organic compounds, but it is difficult to treat large amounts of carbon dioxide
Solution Approach 1:
The patent replaces the electrolysis method with a thermal-desorption-based chemical process. Instead of using electrical energy to drive electrolytic reactions, the system uses controlled heating (50-100°C) to desorb carbon dioxide from the alkaline aqueous solution, achieving much higher throughput and treating large volumes of carbon dioxide efficiently.
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 method allows for efficient recovery of carbon dioxide with reduced thermal and electrical energy, achieving 10-50% desorption at lower temperatures and improving carbon dioxide absorption capacity.
Implementation Method 1
an absorption step of bringing a gas to be treated into contact with an alkaline aqueous solution containing an amine compound as a solute to dissolve carbon dioxide in the alkaline aqueous solution
Implementation Method 2
a desorption step of desorbing the dissolved carbon dioxide by heating the alkaline aqueous solution
Implementation Method 3
the liquid temperature of the alkaline aqueous solution is raised to 50 to 100°C during the execution of the desorption step
Data Source
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AI summary
The purpose of the present invention is to provide a novel carbon dioxide treatment method that allows for recovering carbon dioxide with a relatively small energy from a gas to be treated containing carbon dioxide. The method comprises executing: an absorption step in which carbon dioxide is dissolved in an alkaline aqueous solution containing an amine compound as a solute by bringing a gas to be treated into contact with the alkaline aqueous solution; a desorption step in which the dissolved carbon dioxide is desorbed by heating the alkaline aqueous solution; and a recovery step in which the desorbed carbon dioxide is recovered. When the desorption step is executed, the liquid temperature of the alkaline aqueous solution is raised to 50 to 100°C.