Cryogenic separation

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 7/04 (2006.01) C10G 70/04 (2006.01) F25J 3/02 (2006.01)

Patent

CA 2174514

A process for separating a hydrocarbon mixture containing an alkene, a corresponding alkane having the same number of carbon atoms as the alkene and at least one heavier hydrocarbon component comprises the steps of: a) feeding the hydrocarbon mixture to a first distillation tower (40) having an upper reflux stage; b) recovering a first overhead vapor stream (40V) rich in alkane and alkene from the first distillation tower (40) and passing said overhead vapor stream (40V) to a middle distillation stage of a second distillation tower (50); c) recovering a second overhead vapor stream (50) rich in alkene from the second distillation tower (50); d) adiabatically compressing the second overhead vapor stream (50V) and passing said compressed vapor to a reboiler stage (50B) of the second distillation tower (50) to cool and condense the compressed vapor and heat a liquid reboiler stream.

Procédé de séparation d'un mélange d'hydrocarbures contenant un alcène, un alcane correspondant ayant le même nombre d'atomes de carbone que l'alcène et au moins un composant hydrocarbure plus lourd, qui consiste (a) à introduire le mélange d'hydrocarbures dans une première colonne de distillation (40) ayant un étage supérieur de reflux, (b) à récupérer un premier flux de vapeur supérieur (40V) riche en alcane et en alcène de la première colonne de distillation (40) et à faire passer ledit flux de vapeur supérieur (40V) dans un étage de distillation médian d'une seconde colonne de distillation (50), (c) à récupérer un second flux de vapeur supérieur (50V) riche en alcène de la seconde colonne de distillation (50) et (d) à comprimer de manière adiabatique le second flux de vapeur supérieur (50V) et à faire passer ladite vapeur comprimée dans un étage rebouilleur (50B) de la seconde colonne de distillation (50) pour refroidir et condenser la vapeur comprimée, et chauffer un flux liquide du rebouilleur.

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