TWO-STEP METHOD OF REMOVING CARBON DIOXIDE FROM SYNTHESIS GAS

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 В заявке описан способ удаления диоксида углерода из потока текучей среды посредством водного абсорбента, в соответствии с которым a) поток текучей среды вводят в первую абсорбционную зону (2) и обрабатывают частично регенерированным абсорбентом, b) обработанный поток текучей среды во второй абсорбционной зоне (3) обрабатывают регенерированным абсорбентом, получая очищенный от диоксида углерода поток текучей среды и загруженный абсорбент, c) давление загруженного абсорбента в первом расширительном резервуаре (13) снижают до абсолютного значения в интервале от 1,2 до 3 бар, получая вторичный частично регенерированный абсорбент и первый СО2-содержа