PROCESS TO INCREASE THE H2S / CO2 RELATIONSHIP IN A GAS MIXTURE

摘要

K 6926 A method for increasing the H2S/CO2 ratio in a gas mixture to prepare a gas mixture having an H2S/CO2 ratio suitable for use in a Claus process, in which CO2 and H2S from the starting mixture are absorbed in an aqueous solution of an amine (the absorbent), the absorbed gas is set free from the loaded absorbent in a regeneration column, from a portion of the gas set free the H2S is selectively absorbed in absorbent and the loaded absorbent thus obtained is fed to the said regeneration column. The said portion is chosen in such a way that the gas set free from the regeneration column has the desired H2S/CO2 ratio.