Carbon Dioxide Absorbing Liquid for Low-Temperature Release
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Solution Overview
Problem
Existing carbon dioxide absorbing liquids face challenges with low carbon dioxide absorption and release performance at low temperatures and degrade rapidly during repeated cycles, lacking efficient energy use and durability.
Innovation Solution
A carbon dioxide absorbing liquid comprising a specific amine compound represented by general formula (1) and a liquid medium (B) with defined structural components, including amine compounds like amino alcohols and cyclic polyamines, achieving high absorption and low-temperature release with minimal degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional amine compounds (MEA, DEA, MDEA) are used for carbon dioxide absorption, then absorption capacity is achieved, but release efficiency at low temperatures is poor and energy consumption is high
Solution Approach 1:
The patent modifies the molecular structure of amine compounds by introducing cyclic structures (piperidine, morpholine, azetidine rings) and specific substituents to change the chemical parameters of the absorbing liquid. This structural modification enables the liquid to release carbon dioxide at lower temperatures (100°C or lower) while maintaining absorption capacity, thereby reducing the thermal energy required for the release process
Solution Approach 2:
The patent creates composite absorbing liquids by combining modified amine compounds with specific solvents (sulfolane, N-methyl-2-pyrrolidone, dimethyl sulfoxide, glycerol, ethylene glycol, propylene glycol). This composite approach synergistically enhances both absorption capacity and low-temperature release efficiency, achieving high productivity with reduced energy consumption
2Productivity
If conventional absorbing liquids are used for repeated carbon dioxide absorption and release cycles, then initial absorption performance is achieved, but degradation occurs rapidly reducing durability
Solution Approach 1:
The patent introduces cyclic amine structures (piperidine, morpholine, azetidine rings) with specific molecular parameters that enhance chemical stability. These structural modifications resist degradation during repeated absorption-release cycles, maintaining reliable performance over time while preserving initial absorption productivity
Solution Approach 2:
The patent develops absorbing liquids with extended service life through molecular stabilization, reducing the frequency of replacement needed. The modified amine compounds maintain their functionality through multiple cycles, effectively transforming from short-lived conventional absorbers to durable, cost-effective solutions
3Productivity
If carbon dioxide is released at high temperatures (120°C), then release efficiency is achieved, but energy consumption increases and thermal stress on equipment increases
Solution Approach 1:
The patent fundamentally changes the thermal parameters of the absorbing liquid by incorporating cyclic amine structures with specific heat of absorption characteristics. These modified compounds enable carbon dioxide release at 100°C or lower while maintaining high release efficiency, thereby reducing thermal stress on equipment and lowering energy input requirements
Solution Approach 2:
The patent replaces the conventional thermal-driven release mechanism with a chemically-enhanced release process. The modified amine compounds facilitate carbon dioxide release through their altered molecular structure, allowing efficient release at lower temperatures without relying solely on high thermal energy input
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 absorbing liquid achieves high carbon dioxide recovery with low energy consumption, maintaining efficiency and durability through repeated cycles, enabling compact and cost-effective carbon dioxide separation facilities.
Implementation Method 1
carbon dioxide separation and recovery technology using chemical absorption methods, primarily consisting of aqueous solutions of amine compounds
Implementation Method 2
after absorbing acidic compounds such as carbon dioxide, a phase-separated state is formed
Data Source
AI summary
Provided are: a carbon dioxide absorbing/releasing liquid that has high carbon dioxide absorbing performance and high carbon dioxide releasing performance at low temperature, and that is less likely to degrade when absorbing and releasing cycles are repeated; a carbon dioxide separation/recovery method; and an amine compound production method. The present disclosure relates to an absorbing liquid for separating and recovering carbon dioxide from a gas containing carbon dioxide, the absorbing liquid comprising an amine compound (A) represented by general formula (1), and a liquid medium (B).