Process for selective reduction of benzene and of light...

C - Chemistry – Metallurgy – 07 – C

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C07C 11/02 (2006.01) B01D 3/00 (2006.01) B01J 8/02 (2006.01) C07C 5/27 (2006.01) C07C 7/08 (2006.01) C10G 45/44 (2006.01) C10G 49/00 (2006.01)

Patent

CA 2194084

he invention concerns a process for treating a charge composed mainly of hydrocarbons with at least 5 carbon atoms per molecule and at least one unsaturated compound comprising at most 6 carbon atoms per molecule, including benzene. Said charge is processed in a distillation zone that contains an exhausting section and a stripping section, associated with a hydrogenation reaction zone which comprises at least one catalytic bed in which hydrogenation is carried out on at least part of the unsaturated compounds which have at most 6 carbon atoms per molecule and are contained in the charge. The charge in said reaction zone is recovered at a recovery level and represents at least part of the liquid flowing in the distillation zone; the effluent from the reaction zone is at least partially recirculated to the distillation zone so as to ensure continuous distillation and to obtain at the top of the distillation zone an effluent containing very few unsaturated compounds with at most 6 carbon atoms per molecule, and at the bottom of the zone an effluent containing few unsaturated compounds with at most 6 carbon atoms per molecule. The process is characterized by the fact that the hydrogenation zone is at least partly outside the distillation zone.

L'invention concerne un procédé de traitement d'une charge constituée en majeurepartie par des hydrocarbures comportant au moins 5 atomes de carbone par molécule et comprenant au moins un composé insaturé comportant au plus six atomes de carbone par molécule dont du benzène, tel que l'on traite ladite charge dans une zone de distillation, comportant une zone d'épuisement et une zone de rectification, associée à une zone réactionnelle d'hydrogénation, comportant au moins un lit catalytique, dans laquelle on réalise l'hydrogénation d'au moins une partie des composés insaturés comprenant au plus six atomes de carbone par molécule et contenus dans la charge, la charge de ladite zone réactionnelle étant prélevée à la hauteur d'un niveau de prélèvement et représentant au moins une partie du liquide coulant dans la zone de distillation, l'effluent de la zone réactionnelle étant au moins en partie réintroduit dans la zone de distillation, de manière à assurer la continuité de la distillation et de façon à sortir en tête de la zone de distillation un effluent très appauvri en composés insaturés comprenant au plus 6 atomes de carbone par molécule, et en fond de zone de distillation un effluent appauvri en composés insaturés comprenant au plus six atomes de carbone par molécule, ledit procédé étant caractérisé en ce que la zone d'hydrogénation est au moins en partie externe à la zone de distillation.

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