What is the principle of ethanolamine desulfurization of hydrogen sulfide?
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Is it physical adsorption or a chemical reaction, and how is the ethanolamine solution regenerated?
Ethanolamine desulfurization is a chemical reaction, specifically an acid-base neutralization reaction. The pH value of an aqueous solution of ethanolamine at low temperatures (usually around 40 degrees Celsius) is only 9–11, meaning it is not highly alkaline; however, its absorption reaction with hydrogen sulfide or carbon dioxide is still an acid-base neutralization reaction. The regeneration temperature is around 120 degrees; at this temperature, ethylene amine loses its basic properties and becomes neutral. As a result, the hydrogen sulfide and carbon dioxide that were absorbed earlier are desorbed (released), thereby enabling the ethylene amine solution to be regenerated.
Extraction is carried out by taking advantage of different solubilities