It is a new solvent for selective desulfurization and decarbonization with excellent performance. It has the advantages of high selectivity, low solvent consumption, significant energy-saving effect, and non-degradability.

N-methyldiethanolamine (MDEA, also known as methylaminodiethanol, N,N-bis(2-hydroxyethyl)methylamine)

n-methyldiethanolamine

The molecular formula is CH3-N(CH2CH2OH)2, and the structural formula is:

H2-H2

╲

N — CH3

/

HO—CH2――CH2

Features: Contains two hydroxyl groups and one amino group. Hydroxyl reduces the vapor pressure, increases the solubility, is conducive to the absorption of acid gas, and can increase the concentration, reduce circulation, and reduce energy consumption. The presence of the methyl group in the amino group reduces the alkalinity and activity of the amino group and reduces the CO2 absorption rate.

The molecular weight is 119.16, the melting point is -21°C, the flash point is 127°C, the freezing point is -21°C, and the refractive index is 1.4678. The viscosity (20°C) is 101 MPa·sec. The latent heat of vaporization is 519.16KJ/Kg. Colorless or light yellow viscous liquid, boiling point 247℃, soluble in water and ethanol, slightly soluble in ether. Flammable. It is non-toxic, LD504780mg/kg. 

Hydroxyl reduces the vapor pressure, increases the solubility, is conducive to the absorption of acid gas, and can increase the concentration, reduce the circulation volume, and reduce the energy consumption.a