COMPOSITE AMINE ABSORBENT, REMOVAL UNIT AND REMOVAL METHOD Russian patent published in 2024 - IPC B01D53/14 B01D53/18 B01D53/52 B01D53/62 B01D53/78 B01D53/96 C07D233/70 C07D263/02 

FIELD: chemistry.

SUBSTANCE: invention relates to a composite amine absorbent which absorbs at least one of CO₂ and H₂S in a gas. Composite amine absorbent contains: monoamine with linear chain (a); diamine (b) and a cyclic compound (c) of chemical formula (1)

,

where R¹ is any residue selected from hydrogen, a hydrocarbon group with 1 to 4 carbon atoms and a hydroxyalkyl group, R² is oxygen or N-R³ and R³ is any residue selected from hydrogen and a hydroxyalkyl group; as well as water (d), where diamine (b) contains at least one diamine containing amino groups with the same number of substitutes, concentration of monoamine with linear chain (a) is 15% by weight or more and 60% by weight or less with respect to the total absorbent, concentration of diamine (b) is 1% by weight or more and 25% by weight or less with respect to the total absorbent and the concentration of the cyclic compound (c) satisfying the chemical formula is 1% by weight or more and 30% by weight or less with respect to the total absorbent. Invention also relates to an apparatus and a removal method.

EFFECT: absorption capacity of the absorbent is excellent and absorbed CO₂ and H₂S can be efficiently released.

13 cl, 4 dwg, 6 tbl