Method for removing sulfur-containing contaminants,...

C - Chemistry – Metallurgy – 01 – B

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C01B 17/05 (2006.01) B01D 53/14 (2006.01) B01D 53/48 (2006.01) B01D 53/75 (2006.01) B01D 53/86 (2006.01) C01B 17/04 (2006.01)

Patent

CA 2243482

This invention relates to a method for removing sulfur-containing contaminants in the form of mercaptans and H2S from natural gas, which may also contain CO2 and higher aliphatic and aromatic hydrocarbons, and recovering elemental sulfur, wherein in a first absorption step the sulfur-containing contaminants are removed from the gas, to form on the one hand a purified gas stream and on the other hand a sour gas, which sour gas is fed to a second absorption step in which the sour gas is separated into an H2S-enriched and mercaptan-reduced first gas stream, which is fed to a Claus plant, followed by a selective oxidation step of H2S to elemental sulfur in the tail gas, and an H2S-reduced and mercaptan-enriched second gas stream, which second gas stream, if desired after further treatment, is subjected to a selective oxidation of sulfur compounds to elemental sulfur.

Cette invention se rapporte à un procédé pour éliminer les contaminants à teneur en soufre, sous la forme de mercaptans et de H¿2?S, contenus dans un gaz naturel, qui peut contenir du CO¿2? et des hydrocarbures aliphatiques et aromatiques supérieurs, puis à récupérer le soufre élémentaire. Dans un première phase d'absorption de ce procédé, les contaminants à teneur en soufre sont extraits du gaz, pour former d'une part un courant de base purifié et d'autre part un gaz sulfureux, lequel est amené à une seconde phase d'absorption, dans laquelle le gaz sulfureux est séparé en un premier courant de gaz enrichi en H¿2?S et appauvri en mercaptans, qui est amené à une installation de Claus, suivie par une étape d'oxydation sélective du H¿2?S en soufre élémentaire dans le gaz de queue, et en un second courant de gaz appauvri en H¿2?S et enrichi en mercaptans. Si nécessaire et après un traitement ultérieur, ce second courant de gaz est soumis à un oxydation sélective des composés de soufre en soufre élémentaire.

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