Method for obtaining crude 1,3-butadiene from a c4 fraction

Details Method for obtaining crude 1,3-butadiene from a c4 fraction Method for obtaining crude 1,3-butadiene from a c4 fraction

C - Chemistry, Metallurgy

07

C

C07C 7/08 (2006.01) C07C 11/167 (2006.01)

Patent

CA 2526011

The invention relates to a method for obtaining crude 1,3-butadiene from a C4 fraction, by means of extractive distillation, using a selective solvent in a partition column (TK) in which a partition (T) is arranged in the longitudinal direction of the column, forming a first partial region (A), a second partial region (B) and a lower common column region (C), an extractive wash column (K) being arranged upstream of said partition column. The operation of the partition column (TK) is adjusted by regulating the energy input thereinto (TK) using a bottom evaporator (V) and by means of the arrangement of the number of theoretical separating stages in the lower common column region (C), in such a way that a bottom flow (17) consisting of a purified solvent can be obtained from the partition column (TK).

L'invention concerne un procédé d'extraction de 1,3-butadiène brut par distillation extractive à partir d'une fraction de C¿4?, au moyen d'un solvant sélectif, dans une colonne à paroi de séparation (TK). Ladite colonne comporte une paroi de séparation (T) dans le sens longitudinal de la colonne, formant une première partie (A), une deuxième partie (B) et une zone de colonne commune inférieure (C), une colonne de lavage extractive (K) étant montée en amont de la paroi de séparation. La régulation de l'apport d'énergie à la colonne à paroi de séparation (TK) au moyen d'un évaporateur de bas de colonne (V) et le choix du nombre d'étages de séparation théoriques dans la zone de colonne commune inférieure (C), permettent de régler le fonctionnement de la colonne à paroi de séparation (TK) de manière à obtenir un flux de bas de colonne (17) provenant de la colonne à paroi de séparation (TK), composé de solvant lavé.

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