Methyldiethanolamine (MDEA)

MDEA became important in the gas treating market in recent years due to the fact that MDEA which is tertiary amine shows high selectivity for H₂S over CO₂ in gas streams containing both gases. MDEA solutions have the highest loading compared to any primary or secondary amine, which makes their circulation rate the lowest. MDEA has the lowest heat requirements for regeneration as it has the lowest heats of reaction with H₂S and CO₂. Beside this it has the lowest specific heat solvent losses and a low the freezing point (about − 32°C). MDEA is used in many special solvent formulations especially in combination with Piperazine to enhance its reaction rate.