Process for pretreatment of natural gas containing acid gases

Details Process for pretreatment of natural gas containing acid gases Process for pretreatment of natural gas containing acid gases

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 3/00 (2006.01) B01D 53/14 (2006.01)

Patent

CA 2357863

Process for pretreating a very acid natural gas containing a substantial amount of hydrogen sulfide (H2S), possibly combined with carbon dioxide (CO2), comprising at least a stage wherein the initial natural gas is contacted in a distillation column with a liquid condensate itself resulting from cooling of the gaseous fraction obtained during said contacting stage. This solution allows to eventually recover at a lower cost a gas enriched in methane, depleted in hydrogen sulfide and freed from substantially all of the water it contains, and a liquid phase containing most of the hydrogen sulfide, substantially all of the water and depleted in hydrocarbon. Control of the thermodynamic conditions during the stages that characterize the process, according to the water content of the gas during treatment, allows progressive exhaustion of the water contained in said gas while preventing hydrates formation.

Un procédé de prétraitement d'un gaz naturel très acide contenant une quantité substantielle de sulfure d'hydrogène (H2S), auquel peut être associé du dioxyde de carbone (CO2), comprend au moins une étape dans laquelle le gaz naturel initial est mis en contact dans une colonne de distillation avec un condensat liquide lui-même issu du refroidissement de la fraction gazeuse obtenue lors de ladite phase de mise en contact. Cette solution permet de récupérer finalement à moindre coût un gaz enrichi en méthane, appauvri en sulfure d'hydrogène et débarrassé de sensiblement toute l'eau qu'il contient et une phase liquide contenant la majorité du sulfure d'hydrogène, sensiblement toute l'eau et appauvri en hydrocarbure. Le contrôle des conditions thermodynamiques lors des étapes caractérisant le procédé en fonction de la teneur en eau du gaz en cours de traitement permet l'épuisement progressif de l'eau contenue dans ledit gaz en évitant la formation d'hydrates.

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