Amine-Based Carbon Dioxide Generation via Solvent Addition
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Solution Overview
Problem
Existing methods for releasing carbon dioxide from amines require significant energy, particularly through heating, which hampers efficiency in achieving a decarbonized society.
Innovation Solution
A method involving the addition of a solvent to a carbon dioxide generating agent containing an amine that has absorbed and fixed carbon dioxide, specifically an optionally substituted N—C7-14 aralkylcarbamic acid or a salt thereof, and/or an optionally substituted C7-14 aralkylamine bicarbonate, or a hydrate thereof, at ambient temperature under normal pressure, without any physicochemical treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If heating is used to release carbon dioxide from amine absorbents, then carbon dioxide can be effectively separated, but high energy consumption occurs
Solution Approach 1:
The invention changes the chemical structure parameter of the amine absorbent by introducing hydrophobic functional groups (such as aromatic rings, alkyl groups, or fluorinated groups) adjacent to the amino group. This structural modification alters the interaction between the amine-CO2 complex and water, enabling CO2 release at lower temperatures and reducing the energy required for separation while maintaining high productivity
Solution Approach 2:
The invention creates composite amine structures by combining hydrophobic functional groups with amino groups to form hybrid molecules. These composite structures exhibit both high CO2 absorption capacity and easy release characteristics, resolving the contradiction between effective separation and energy consumption
2Quantity of substance
If aqueous amine solutions are used for carbon dioxide absorption, then absorption capacity is improved, but water heating energy is required
Solution Approach 1:
The invention changes the hydrophilicity parameter of the amine by incorporating hydrophobic functional groups, transforming the absorbent from hydrophilic to hydrophobic character. This allows the use of non-aqueous or reduced-aqueous solutions, eliminating the need to heat large amounts of water while preserving CO2 absorption capacity
Solution Approach 2:
The invention extracts water from the amine-CO2 system by using hydrophobic amines that do not require aqueous solutions for effective CO2 absorption. This removal of water eliminates the energy burden of heating water during the CO2 release process while maintaining absorption capacity
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 efficiently releases carbon dioxide at ambient temperature under normal pressure, reducing separation energy to nearly zero and providing a novel, environmentally friendly approach.
Implementation Method 1
adding a solvent to a carbon dioxide generating agent comprising an optionally substituted N—C7-14 aralkylcarbamic acid or a salt thereof, and/or an optionally substituted C7-14 aralkylamine bicarbonate, or a hydrate thereof
Data Source
AI summary
A method for generating carbon dioxide is disclosed. The method can used for efficiently separating immobilized carbon dioxide from amines, which have absorbed and immobilized the carbon dioxide, without using energy such as heat. The method for generating carbon dioxide is characterized by efficiently generating carbon dioxide at room temperature and atmospheric pressure by adding a solvent to a carbon dioxide generator which contains an optionally substituted N—C7-14 aralkyl carbamic acid or a salt thereof and/or a bicarbonate of an optionally substituted C7-14 aralkyl amine, or a hydrate of these compounds.