Countercurrent hydroprocessing

C - Chemistry – Metallurgy – 10 – G

Patent

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Details

C10G 49/00 (2006.01)

Patent

CA 2467094

Method for the hydroprocessing of a heavy hydrocarbonaceous feedstock in a reaction zone (10) comprising a bed (11) containing a fixed array of porous catalyst particles by contacting the feedstock with a hydrogen-containing gas under conditions which allow distributing the feedstock predominantly in liquid phase under superatmospheric process conditions at elevated temperature over the catalyst bed (11) for downward flow in contact with the catalyst particles and introduction of the hydrogen-containing gas in the reaction zone (10) below the catalyst bed (11) in order to establish countercurrent contact of the upwardly flowing gas with the downcoming liquid and withdrawing treated liquid below the catalyst bed (11) and withdrawing fluid depleted in hydrogen above the catalyst bed (11), in which process the catalyst bed (11) has a void volume fraction below 0.5, whilst the countercurrent liquid/gas contacting is carried out under conditions which allow the Peclet number of the liquid to be in the range between 0 and 10.

La présente invention concerne un procédé d'hydrocraquage pour produit pétrolier lourd utilisant, dans la zone de réaction (10), un lit (11) à catalyseur poreux en matrice fixe de particules. On met le produit lourd en contact avec un gaz hydrogéné dans des conditions permettant la répartition du produit essentiellement en phase liquide. Le traitement se fait en surpression atmosphérique, à haute température, sur lit catalytique (11). Dans sa descente, la phase liquide entre en contact avec les particules de catalyseur. Le gaz hydrogéné introduit dans la zone de réaction (10) en dessous du lit catalytique (11) remonte à contre courant de la phase liquide descendante avec laquelle il entre en contact. Le prélèvement du liquide traité se fait sous le lit catalytique (11), le retrait du fluide appauvri en hydrogène, au-dessus du lit catalytique (11). Pendant le traitement, la fraction de vide du lit catalytique (11) reste en dessous de 0,5, le contact à du liquide contre courant du gaz intervenant dans des conditions permettant de maintenir le nombre de Péclet du liquide dans la plage de 0 à 10.

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