Mechanochemical CO2 Trapping With Concentrated Amines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for trapping and storing CO2 in industrial exhaust gases, particularly from cement production, face challenges with slow reaction kinetics, high water consumption, and economic viability, especially in the context of the IAM route using industrial amines like MEA and NaGly, which suffer from inefficiency and environmental toxicity, and lack effective solutions to address these challenges.
Innovation Solution
A method involving the use of concentrated amine or amino acid solutions at least 3M, combined with mechanical energy input during contact with alkaline earth metal oxides or silicates, significantly reducing water usage and enhancing reaction kinetics and regeneration rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the IAM route using industrial amines (MEA, NaGly) is used for CO2 trapping, then CO2 absorption capacity is improved, but reaction kinetics become slow and water consumption increases
Solution Approach 1:
The patent changes the concentration parameter of the amine solution from typical dilute conditions to highly concentrated (30-50% w/w), which fundamentally alters the reaction kinetics and water activity in the system, thereby improving both CO2 absorption capacity and reaction rate simultaneously
Solution Approach 2:
The patent uses composite amine blends (e.g., MEA+AMP, DEA+MDEA) that combine the high CO2 absorption capacity of primary/secondary amines with the fast kinetics of specific amine combinations, achieving both high capacity and fast reaction rates
2Quantity of substance
If the IAM route using industrial amines is used for CO2 trapping, then CO2 absorption capacity is improved, but water consumption increases
Solution Approach 1:
The patent changes the concentration parameter of the amine solution from typical dilute conditions to highly concentrated (30-50% w/ w), which fundamentally alters the reaction kinetics and water activity in the system, thereby improving both CO2 absorption capacity and reaction rate simultaneously
Solution Approach 2:
The concentrated amine solution serves its own water needs for the reaction, requiring minimal external water addition, as the high concentration provides sufficient water activity for carbonate formation without needing large amounts of dilution water
3Object-generated harmful factors
If conventional CO2 trapping technologies are used, then CO2 emissions are reduced, but implementation cost increases
Solution Approach 1:
The patent employs conventional industrial amines that are relatively inexpensive and readily available, treating the absorbent as a consumable that can be regenerated or replaced economically, making the technology economically viable for large-scale deployment
Solution Approach 2:
The patent changes the concentration parameter of the amine solution from typical dilute conditions to highly concentrated (30-50% w/w), which fundamentally alters the reaction kinetics and water activity in the system, thereby improving both CO2 absorption capacity and reaction rate simultaneously
4Quantity of substance
If industrial amines are used for CO2 trapping, then CO2 absorption capacity is improved, but environmental toxicity increases
Solution Approach 1:
The patent uses composite amine blends (e.g., MEA+AMP, DEA+MDEA) that combine the high CO2 absorption capacity of primary/secondary amines with the fast kinetics of specific amine combinations, achieving both high capacity and fast reaction rates
Solution Approach 2:
The patent changes the concentration parameter of the amine solution from typical dilute conditions to highly concentrated (30-50% w/w), which fundamentally alters the reaction kinetics and water activity in the system, thereby improving both CO2 absorption capacity and reaction rate simultaneously
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 achieves higher CO2 trapping and storage efficiency with reduced water consumption, faster reaction kinetics, and improved absorbent regeneration, making it industrially and economically viable.
Implementation Method 1
bringing the solution thus obtained into contact with a CO2-containing gas
Implementation Method 2
bringing into contact, while stirring, the concentrated solution obtained in step b) with an oxide, a hydroxide, a silicate, an aluminate, a phosphate, a chloride or a sulfate of alkaline earth metal
Data Source
AI summary
Method for trapping and storing CO2 by mechanochemical route including: a) dissolving an amine or amino acid to obtain a concentrated solution whose concentration of amine function is at least 3M; b) bringing the solution into contact with a CO2-containing gas; c)1. bringing into contact under stirring the solution with an oxide, hydroxide, silicate, aluminate, phosphate, chloride or sulfate of alkaline earth metal or a material containing an oxide, silicate, aluminate, phosphate, chloride or sulfate of alkaline earth metal, the energy implemented for stirring being at least 2.5 W per gram; or 2. bringing into contact under grinding the precipitate with an oxide, hydroxide, silicate, aluminate, phosphate, chloride or sulfate of alkaline earth metal or a material containing an oxide, silicate, aluminate, phosphate, chloride or sulfate of alkaline earth metal, the energy implemented for grinding being at least 2.5 W per gram; and d) washing the obtained solid.