TWO-STEP METHOD OF REMOVING CARBON DIOXIDE FROM SYNTHESIS GAS Russian patent published in 2021 - IPC B01D53/14 

FIELD: chemical or physical processes.

SUBSTANCE: application describes a method of removing carbon dioxide from a stream of a fluid through an aqueous absorbent, according to which a) fluid medium flow is introduced into first absorption zone (2) and treated with partially regenerated absorbent, b) the treated fluid medium flow in the second absorption zone (3) is treated with the regenerated absorbent to obtain a carbon dioxide-purified fluid flow and the loaded absorbent, c) pressure of loaded absorbent in first expansion tank (13) is reduced to absolute value in range from 1.2 to 3 bar, obtaining secondary partially regenerated absorbent and first CO₂-containing gas flow, d) pressure of the secondary partially regenerated absorbent in the second expansion tank (21) is reduced to an absolute value in range of 1 to 1.2 bar, obtaining partially regenerated absorbent and containing water vapor of second CO₂-containing gas flow, e) partial flow of partially regenerated absorbent is supplied to first absorption zone (2), and another partial stream of partially regenerated absorbent is fed into stripping column (29), in which partially regenerated absorbent is subjected to thermal regeneration, obtaining regenerated absorbent and third CO₂-containing gas stream, wherein stripping column (29) is operated under pressure, at least 0.9 bar higher than pressure in first expansion tank (13), f) regenerated absorbent is returned to second absorption zone (3), g) containing water vapor of second CO₂-containing gas stream is compressed by jet pump (31) and in first expansion tank (13) is brought into direct heat exchange contact with loaded absorbent, wherein jet pump (31) is driven by means of third CO₂-containing gas flow.

EFFECT: disclosed is a two-step method of removing carbon dioxide from synthesis gas.

10 cl, 1 tbl, 1 dwg