Continuous method for separating a c4 cut

Details Continuous method for separating a c4 cut Continuous method for separating a c4 cut

C - Chemistry, Metallurgy

07

C

C07C 7/08 (2006.01) B01D 3/40 (2006.01) C07C 5/22 (2006.01)

Patent

CA 2493079

The invention relates to a continuous method for separating a C4 cut (C4) by means of extractive distillation using a selective solvent (LM) in an extractive distillation column (EDK). A separating wall (TW), forming a first partial region (A), a second partial region (B) and a lower common column region (C), is arranged in the longitudinal direction of the extractive distillation column (EDK). According to said method, a head flow (C4H10) comprising butane is separated from the first partial region (A), a head flow (C4H8) comprising butene is separated from the second partial region (B), and a flow (C4H6) comprising the hydrocarbons from the C4 cut is separated from the lower common column region (C), said hydrocarbons dissolving more easily in the selective solvent (LM) than the butane and the butene.

L'invention concerne u procédé continu de séparation d'une coupe C¿4? (C¿4?) par distillation extractive avec un solvant sélectif (LM) dans une colonne de distillation extractive (EDK). Une paroi de séparation (TW) est placée dans la colonne de distillation extractive (EDK) dans son sens longitudinal, de manière à former une première zone partielle (A), une seconde zone partielle (B) et une zone de colonne commune (C). Le procédé se caractérise en ce qu'un courant de tête (C¿4?H¿10?) comprenant du butane est séparé de la première zone partielle (A), un courant de tête (C¿4?H¿8?) comprenant du butène est séparé de la seconde zone partielle (B) et un courant (C¿4?H¿6?) comprenant les hydrocarbures provenant de la coupe C¿4? est séparé d'une zone commune de la colonne (C), qui se dissolvent mieux dans un solvant sélectif (LM) que le butane ou le butène.

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