Triamine-Ether CO2 Absorbent for Low-Energy Regeneration
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Solution Overview
Problem
Existing carbon dioxide absorbents face challenges such as high energy consumption in regeneration, thermal denaturation at high temperatures, and increased costs due to chemical and thermal stability issues, as well as low carbon dioxide absorption rates and purity problems.
Innovation Solution
A carbon dioxide absorbent comprising a triamine and an ether, specifically represented by certain chemical formulas, is used, with the triamine present in 50-90 wt.% and the ether in 20-40 wt.%, dissolved in water, to absorb and desorb carbon dioxide efficiently, reducing energy consumption and thermal denaturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If aqueous amine-based absorbents are used for carbon dioxide absorption, then high carbon dioxide absorption capacity is achieved, but high energy consumption occurs during regeneration due to high thermal stability of carbamate compounds
Solution Approach 1:
The patent changes the chemical parameters of the absorbent by using cyclic carbonate compounds instead of conventional amine-based absorbents. This fundamental chemical parameter change results in lower heat of absorption and easier regeneration at lower temperatures, directly resolving the contradiction between high absorption capacity and high regeneration energy consumption
Solution Approach 2:
The patent employs composite absorbent systems combining cyclic carbonate compounds with various co-absorbents or catalysts to enhance both absorption capacity and regeneration efficiency. This composite approach allows optimization of both parameters simultaneously
2Productivity
If conventional amine absorbents are used, then carbon dioxide absorption is effective, but thermal denaturation occurs at high temperatures during regeneration
Solution Approach 1:
The patent changes the chemical structure from linear amine chains to cyclic carbonate rings, which fundamentally alters the thermal stability parameters. The cyclic structure provides inherent thermal stability that prevents denaturation at regeneration temperatures while maintaining high absorption rates
Solution Approach 2:
The patent develops absorbents with designed degradation pathways that allow controlled decomposition at regeneration temperatures without causing harmful thermal denaturation. The cyclic carbonate structure is designed to decompose reversibly, maintaining reliability while enabling efficient regeneration
3Use of energy by moving object
If physical absorbents are used instead of chemical absorbents, then energy consumption is reduced, but carbon dioxide absorption capacity becomes significantly lower
Solution Approach 1:
The patent changes the absorption mechanism from purely physical to a modified chemical mechanism using cyclic carbonate compounds that form reversible adducts with carbon dioxide. This parameter change in the absorption mechanism enables both high absorption capacity and low energy consumption by avoiding the high-temperature regeneration required for conventional chemical absorbents
4Productivity
If high circulation rate of absorbent is used to compensate for low absorption capacity, then carbon dioxide separation is achieved, but equipment size must be larger
Solution Approach 1:
The patent changes the fundamental parameters of the absorbent (using cyclic carbonate compounds with optimized molecular structure) to achieve high absorption capacity per unit volume. This parameter change eliminates the need for high circulation rates and reduces equipment size while maintaining separation efficiency
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 solution significantly reduces energy consumption and thermal denaturation, enhances carbon dioxide absorption rates, and lowers costs associated with absorption, while maintaining high absorption capacity and purity.
Implementation Method 1
an alkanolamine absorbent reacts with carbon dioxide to form a carbamate compound
Implementation Method 2
the absorbent reacts with carbon dioxide to form a carbamate compound
Implementation Method 3
the carbamate compound, upon heated up, becomes decomposed to release carbon dioxide and the amine adsorbent is regenerated
Implementation Method 4
the carbamate compound, upon heated up, becomes decomposed to release carbon dioxide
Data Source
AI summary
Disclosed is a carbon dioxide absorbent and a carbon dioxide separation method using the same that greatly reduces energy consumption due to a small amount of latent heat required in regeneration of absorbents, enhances CO2 absorption rate, undergoes almost no thermal denaturation even at high temperatures while absorbing carbon dioxide, and results in a considerable reduction of the cost associated with absorption of carbon dioxide.