FREMGANGSMAATE TIL AA FJERNE CO2 OG/ELLER H2S FRA GASSER

摘要

1. A process for removing CO2 and/or H2 S from a gas containing CO2 and/or H2 S in which, a) the gas containing CO2 and/or H2 S is treated, in a first absorption stage, at from 40 to 100 degrees C, with an aqueous absorption liquid containing from 20 to 70% by weight of methyldiethanolamine, b) the gas obtained at the top of the first absorption stage is fed to a second absorption stage in which, to effect removal, of CO2 and/or H2 S, it is treated at from 30 to 90 degrees C with an aqueous absorption liquid which contains from 20 to 70% by weight of methyldiethanolamine and has a lower content of CO2 and/or H2 S than the absorption liquid fed into the first absorption stage, c) the treated gas is taken off at the top of the second absorption stage, d) the aqueous absorption liquid obtained at the bottom of the second absorption stage and preladen with CO2 and/or H2 S is fed to the top of the first absorption stage, e) the aqueous absorption liquid obtained in the lower part of the first absorption stage and laden with CO2 and/or H2 S is let down in two or more flash stages in order to regenerate it, the final flash stage being operated under reduced pressure, f) a stream of absorption liquid obtained at the bottom of the final flash stage is recycled to the first absorption stage, g) a further stream of absorption liquid obtained at the bottom of the final and/or penultimate flash stage is fed to a stripping zone for further regeneration, and h) the regenerated absorption liquid obtained at the bottom of the stripping zone is recycled to the second absorption stage.