Pyrimidine Triazine Additives for Amine Absorbent Stability
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Solution Overview
Problem
Aqueous solutions of amines used for deacidification of gaseous effluents, such as flue gas, degrade in the presence of oxygen, leading to reduced absorption capacity, formation of volatile degradation products, and environmental concerns due to ammonia emissions, which affects the performance and efficiency of gas deacidification units.
Innovation Solution
Incorporating degradation-inhibiting additives, specifically derivatives of pyrimidine and triazine compounds with sulfur substituents, into the absorbent solution to prevent or limit the degradation of amines, thereby maintaining the solution's stability and absorption efficiency even in the presence of oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aqueous solutions of amines are used for deacidification of gaseous effluents, then absorption capacity for acidic compounds is achieved, but degradation occurs in the presence of oxygen leading to reduced performance and environmental issues
Solution Approach 1:
The patent introduces pyrimidine and triazine derivatives as intermediary substances that mediate between the amine absorbent and oxygen. These compounds act as radical scavengers and oxidation inhibitors, protecting the amine from degradation while allowing the deacidification process to continue effectively.
Solution Approach 2:
The patent modifies the chemical composition parameters of the absorbent solution by adding specific heterocyclic compounds (pyrimidine and triazine derivatives). This changes the oxidation resistance parameter of the solution, allowing it to maintain stability in the presence of oxygen while retaining absorption capacity.
2Productivity
If higher concentrations of amines are used to improve absorption capacity, then deacidification efficiency increases, but degradation rate increases in the presence of oxygen
Solution Approach 1:
The pyrimidine and triazine derivatives serve as protective intermediaries that reduce the direct interaction between oxygen and amine molecules. This allows higher amine concentrations to be used for improved productivity without proportionally increasing degradation and substance loss.
3Reliability
If degradation-inhibiting additives are added to prevent amine degradation, then stability is improved, but solution composition becomes more complex
Solution Approach 1:
The patent specifies precise concentration ranges for the degradation-inhibiting additives (0.1-10% by weight) to optimize stability while minimizing complexity. This controlled parameter change ensures the additives provide sufficient protection without overly complicating the solution composition.
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 use of these additives significantly reduces the degradation of amine solutions, maintaining their absorption capacity and reducing volatile emissions, allowing for higher amine concentrations without increased degradation, thus enhancing the performance and reducing operational costs of deacidification processes.
Implementation Method 1
compounds are added to the absorbent solution whose role is to prevent or limit the phenomena of degradation of the amine compounds, notably the degradation caused by oxidation phenomena
Implementation Method 2
The absorbent solution makes it possible to absorb the acidic compounds present in the gaseous effluent (H2S, mercaptans, CO2, COS, SO2, CS2)
Data Source
AI summary
The degradation of an absorbent solution comprising organic compounds provided with an amine function in aqueous solution is reduced considerably in the presence of a small amount of degradation-inhibiting additives belonging to the class of derivatives of pyrimidine or of triazine, at least one substituent of which contains a sulfur atom.The absorbent solution is employed for deacidifying a gaseous effluent.