FIELD: chemistry.
SUBSTANCE: invention relates to a method for producing light olefins and BTX from a first feedstock of the hydrotreated VGO or unconverted crude oil (UCO) type, exiting from hydrocracking, or any mixture of these two types of feedstock, and second naphtha-type feedstock with an initial boiling point above 30 °C and final boiling point below 220 °C, wherein said method includes a catalytic cracking unit (FCC), processing a hydrotreated fraction of VGO or non-converted oil, a catalytic reforming unit (REF), processing said naphtha fraction (30 °C–220 °C) and an aromatic complex (CA), into which the stream from catalytic reforming (REF) and the fraction denoted as LCN (PI-160 °C) flows from the FCC. Said method includes the sequence of the following operations: feeding a hydrotreated fraction of VGO or unconverted UCO oil (2) or any mixture of both to the FCC unit, which produces streams (6), fed to the fractionation unit (FRAC), from which the light fraction (8) is collected, LCN fraction (PI-160 °C), HCN fraction (160 °C–220 °C) and heavy fraction (220 °C+), feeding the light fraction (8) into a separation unit, called a cold box (SBF), allowing the separation of light olefins, ethylene and propylene, dry gases (H2 and CH4) and light paraffins C2, C3 and C4, feeding the gasoline fraction (PI-160 °C), denoted by LCN (9), to the aromatic complex (CA) mixed with streams (5) leaving catalytic reforming (RF) to form raw material (10) for the aromatic complex (CA), HCN fraction (160°C–220 °C) used as is, the heavy fraction (220 °C+) with an initial boiling point above 220 °C is returned to the FCC unit, feeding hydrotreated naphtha (4) as raw materials to the catalytic reforming unit (REF), collecting from the aromatic complex (CA) BTX, raffinate (12), defined as the non-aromatic part of the effluent, which is fed, at least in part, in a mixture with raw materials (2) of FCC and a fraction, called heavy aromatics (11), which is also fed in a mixture with raw materials (2) of the FCC, and said FCC unit operates under the following conditions: - temperature at the outlet of the reactor with upward flow ranges from 500 °C to 650 °C, - C/O (the ratio of the mass consumption of the catalyst to the mass consumption of raw materials) is from 5 to 30, wherein the catalyst used in the FCC is a zeolite to which ZSM-5 is added.
EFFECT: use of the invention allows to restore the heat balance through the exchange of material flows between the FCC and the aromatic complex.
4 cl, 2 ex, 7 tbl, 3 dwg
