Amino-Siloxane CO2 Absorbent Viscosity Management
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Solution Overview
Problem
Conventional absorbent solvents used for capturing CO2 experience increased viscosity when reacting with the gas, reducing CO2 uptake and requiring carrier fluids that increase energy consumption and decrease solvent performance.
Innovation Solution
Amino-siloxanes with primary or secondary amine groups separated from heteroatoms by ethyl linkages are used as absorbent compositions, maintaining a flowable liquid phase and avoiding the need for carrier fluids, thereby maintaining high CO2 capture efficiency and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional absorbent solvents are used to capture CO2, then CO2 capture function is achieved, but viscosity increases reducing mass transfer and CO2 uptake
Solution Approach 1:
The patent changes the chemical composition parameters of the absorbent by using amino-siloxanes with specific molecular structures (primary or secondary amine groups separated from heteroatoms by ethyl linkages). This molecular design modification allows the absorbent to maintain lower viscosity upon CO2 reaction while preserving high CO2 uptake capacity, directly resolving the contradiction between CO2 capture effectiveness and viscosity increase.
2Stability of the object's composition
If carrier fluid is added to reduce viscosity, then flowability is improved, but CO2 uptake decreases and energy consumption increases
Solution Approach 1:
The patent extracts and eliminates the carrier fluid component from the absorbent system. By designing amino-siloxanes with intrinsic low-viscosity properties upon CO2 reaction, the invention removes the need for water or other carrier fluids that would otherwise be required to maintain flowability. This extraction resolves the contradiction by achieving flowability without the penalties of reduced CO2 uptake and increased energy consumption associated with carrier fluid heating and evaporation.
3Stability of the object's composition
If carrier fluid is used to maintain flowability, then liquid phase is preserved, but energy consumption increases due to heating and evaporation
Solution Approach 1:
The amino-siloxane absorbent provides self-service by inherently maintaining liquid phase flowability through its molecular structure design. The ethyl linkage separation between amine groups and heteroatoms creates sufficient molecular spacing that prevents excessive viscosity increase upon CO2 reaction, eliminating the need for external carrier fluids. This self-service approach resolves the energy consumption contradiction by removing the heating and evaporation energy requirements associated with carrier fluid management.
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 amino-siloxane compositions effectively capture CO2 while maintaining a low viscosity reaction product, enhancing CO2 uptake and reducing energy requirements, making them suitable for large-scale implementation.
Implementation Method 1
Conventional absorbent solvents used to capture a target gas, such as CO2 or other exhaust gases
Implementation Method 2
the absorbent solvents may form solids or very high viscosity oils upon reacting with CO2
Data Source
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Figure 2B
AI summary
An absorbent composition includes an amino-siloxane having structure (I): wherein R1 is independently at each occurrence a C1-C6 aliphatic or aromatic radical; R2 is independently at each occurrence a C2-C10 aliphatic or aromatic radical; R3 is independently at each occurrence a hydrogen atom or a C1-C6 aliphatic or aromatic radical; R4 is independently at each occurrence a C1-C18 aliphatic or aromatic radical or R5, wherein R5 comprises structure (II): wherein X is independently at each occurrence an oxygen atom or a sulfur atom; w is between 0 and 5; y is between 0 and 10; and z is between 0 and 10; wherein, when R4 is R5 comprising the structure (II), a sum of w, y, and z is greater than or equal to 0, and, when R4 is not R5, a sum of w, y, and z is greater than or equal to 1.