Patent ID: 8933283
Filing Date: 2015-01-13
Classification: C10G

Abstract:
1. A process for preparing liquefied petroleum gas, low-sulfur gas oil, benzene, toluene, and xylene from a fluid catalytic cracked oil fraction, comprising: (a) separating a fluid catalytic cracked oil fraction having a boiling point range of from 160° C. to 360° C. into an effluent oil fraction having a boiling point range of from 160° C. to 220° C. and a residual oil fraction having a boiling point range of from 220° C. to 360° C. by distillation, the fluid catalytic cracked oil fraction containing less than 2 mass % of benzene, toluene and xylene and being substantially free of liquefied petroleum gas; (b) subjecting the effluent oil fraction to hydrodesulfurization/hydrodenitrogenation to remove sulfur and nitrogen compounds therein; (c) subjecting the effluent oil fraction from step (b) to hydrocracking and dealkylation/transalkylation in the presence of a catalyst comprising (I) a support mixture of 10 to 95 wt % of at least one zeolite selected from the group consisting of mordenite, beta type zeolite and ZSM-5 type zeolite, the zeolite having a molar ratio of silica/alumina of 200 or less, and 5 to 90 wt % of an inorganic binder, and (II) a metal component consisting of (i) 0.01 to 0.5 parts by weight of platinum and (ii) 0.1 to 5.0 parts by weight of tin or 0.02 to 5.0 parts by weight of lead, based on the total weight of the mixture support, to convert aromatic hydrocarbon compounds in the effluent oil fraction into an aromatic hydrocarbon mixture enriched in benzene, toluene and xylene and to convert non-aromatic hydrocarbon compounds in the effluent oil fraction into a liquefied petroleum gas-enriched non-aromatic hydrocarbon mixture containing fuel gas; (d) separating the effluent oil fraction from step (c) into a converted oil fraction and a unconverted oil fraction, and separately recovering fuel gas, liquefied petroleum gas and an aromatic mixture of benzene, toluene and xylene from the converted oil fraction; and (e) subjecting the residual oil fraction of step (a) to hydrodesulfurization/hydrodenitrogenation, followed by mixing at least a part of the unconverted oil fraction therewith, and recovering the resulting mixture of oil fractions as low-sulfur gas oil; wherein the hydrodesulfurization/hydrodenitrogenation in each of steps (b) and (e) is carried out under conditions of hydrogen partial pressure of 10 to 50 kg/cm wherein the effluent oil fraction from step (c) contains benzene, toluene and xylene in an amount of 15 mass % or more, and liquefied petroleum gas of 12 mass % or more, wherein no petroleum fraction other than the fluid catalytic cracked oil fraction is supplied to the process, and wherein no separation of the effluent oil fraction is carried out between steps (b) and (c).