MDEA desulfurization
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Dear experts, I use MDEA at a concentration of 50% for desulfurization in my plant. However, due to process-related issues, the temperature of the feed gas entering the absorption tower has risen to 55 degrees, the temperature of the MDEA solution (lean solution) has increased to 61 degrees, and the temperature in the middle part of the tower has reached 78 degrees. The desulfurization effect has now significantly declined. I would like to ask the experts: Is the current operating temperature already higher than the normal operating temperature for MDEA desulfurization? Are there any ways to improve the desulfurization efficiency without lowering the temperature? And what is the optimal desulfurization temperature?
At lower temperatures (20°C–40°C), MDEA facilitates the desulfurization reaction (absorption), while at higher temperatures (>105°C), it promotes the regeneration reaction (desorption). To prevent solvent decomposition, the regeneration temperature is generally not higher than 127°C.