Process for producing purified natural gas

F - Mech Eng,Light,Heat,Weapons – 25 – J

Patent

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Details

F25J 1/02 (2006.01) B01D 53/52 (2006.01) C10L 3/10 (2006.01) F25J 3/02 (2006.01)

Patent

CA 2667429

The invention provides a process for producing purified natural gas, the process comprising the steps of : expanding a pressurised natural gas stream comprising at least 4 ppmv of mercaptans and supplying it to a first separation column, in which the natural gas stream is separated into a gaseous overhead stream enriched in methane and a first fraction enriched in mercaptans; withdrawing the gaseous overhead stream enriched in methane from the separation column to obtain the purified natural gas; withdrawing the fraction enriched in mercaptans from the separation column; removing mercaptans from the first fraction enriched in mercaptans.

L'invention concerne un procédé de production de gaz naturel purifié, le procédé comprenant les étapes consistant à : (a) dilater un flux de gaz naturel pressurisé comprenant au moins 4 ppmv de mercaptans et alimenter le flux de gaz naturel dépressurisé résultant dans une première colonne de séparation, dans laquelle le flux de gaz naturel est séparé en un flux gazeux aérien enrichi en méthane et une première fraction enrichie en mercaptans; (b) retirer le flux aérien gazeux de la première colonne de séparation enrichi en méthane de la colonne de séparation de façon à obtenir le gaz naturel purifié; (c) retirer la fraction enrichie en mercaptans de la colonne de séparation; (d) éventuellement alimenter la fraction retirée comprenant des mercaptans dans une seconde colonne de séparation, dans laquelle la fraction comprenant des mercaptans est séparée en un flux aérien enrichi en éthane et une seconde fraction enrichie en mercaptans; (e) éliminer les mercaptans de la première fraction enrichie en mercaptans ou de la seconde fraction enrichie en mercaptans.

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