Method and apparatus for separating one or more c2+...

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

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F25J 3/02 (2006.01) C10G 5/06 (2006.01) C10L 3/10 (2006.01) F25J 3/06 (2006.01)

Patent

CA 2682308

A method for separating one or more C2+ hydrocarbons from a mixed phase hydrocarbon stream such as partly vapourised liquefied natural gas, the method at least comprising the steps of : (a) supplying a mixed phase hydrocarbon feed stream (10) to a first gas/liquid separator (12); (b) separating the hydrocarbon feed stream (10) in the first gas/liquid separator (12) into a first gaseous stream (20) from a first outlet (23) and at least one C2+ liquid stream (30); (c) passing the first gaseous stream (20) through a compressor (14) to provide a compressed stream (60); and (d) cooling the compressed stream (60) in one or more heat exchangers (16) to provide an at least partly condensed hydrocarbon product stream (70); wherein a second gaseous stream (40) is added to a stream (20, 60, 70) downstream of the first outlet (23).

L'invention concerne un procédé pour la séparation d'un ou plusieurs hydrocarbures C2+ d'un flux d'hydrocarbures à phase mixte, par exemple un gaz naturel liquéfié partiellement vaporisé, le procédé comprenant au moins les étapes consistant à : (a) fournir un flux d'alimentation en hydrocarbures à phase mixte (10) à un premier séparateur gaz/liquides (12) ; (b) séparer le flux d'alimentation en hydrocarbures (10) dans le premier séparateur gaz/liquides (12) en un premier flux gazeux (20) au niveau d'un premier orifice de sortie (23) et au moins un flux liquide de C2+ (30) ; (c) faire passer le premier flux gazeux (20) à travers un compresseur (14) pour fournir un flux comprimé (60) ; et (d) refroidir le flux comprimé (60) dans un ou plusieurs échangeurs thermiques (16) pour fournir un flux de produits hydrocarbures au moins partiellement condensés (70) ; un deuxième flux gazeux (40) est ajouté à un flux (20, 60, 70) en aval du premier orifice de sortie (23).

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