Method for producing a methane-rich stream and a c2+...

Details Method for producing a methane-rich stream and a c2+... Method for producing a methane-rich stream and a c2+...

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 3/02 (2006.01) C07C 7/09 (2006.01) C07C 9/02 (2006.01) C07C 9/14 (2006.01) F25J 3/06 (2006.01)

Patent

CA 2760426

The invention relates to a method including cooling natural feed gas (15) in a first heat exchanger (16), and injecting the cooled natural feed gas (40) into a first disengager (18). The method includes dynamically expanding a turbine feed stream (46) in a first expansion turbine (22), and injecting the expanded stream (102) into a splitter (26). Said method comprises removing, at the head of the splitter (26), a head stream (82) rich in methane, and removing a first recirculation stream (88) from the compressed methane-rich head stream (86). The method includes forming at least one second recirculation stream (96) obtained from the methane-rich head stream (82) downstream from the splitter (26) and forming a dynamic expansion stream (100) from the second recirculation stream (96).

Ce procédé comprend le refroidissement du gaz naturel de charge (15) dans un premier échangeur thermique (16), et l'introduction du gaz naturel de charge refroidi (40) dans un premier ballon séparateur (18). Il comprend la détente dynamique d'un flux d'alimentation de turbine (46) dans une première turbine de détente (22), et l'introduction du flux détendu (102) dans une colonne de séparation (26). Ce procédé comporte le prélèvement en tête de la colonne de séparation (26) d'un courant de tête (82) riche en méthane et le prélèvement dans le courant de tête riche en méthane comprimé (86) d'un premier courant (88) de recirculation. Le procédé comprend la formation d'au moins un deuxième courant (96) de recirculation obtenu à partir du courant de tête riche en méthane (82) en aval de la colonne de séparation (26) et la formation d'un courant (100) de détente dynamique à partir du deuxième courant de recirculation (96).

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