METHOD FOR PREPARING LIGHT OLEFINS AND BTX, USING CATALYTIC CRACKING UNIT NCC, PROCESSING NAPHTHA-TYPE FEEDSTOCK, CATALYTIC REFORMING UNIT AND AROMATIC COMPLEX Russian patent published in 2018 - IPC C10G11/00 C10G63/04 C10G63/08 C10G35/00 C07C11/04 C07C11/06 C07C15/04 C07C15/06 C07C15/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to a method for producing light olefins and BTX from a naphtha fraction with an initial boiling point above 30 °C and final boiling point below 220 °C, wherein using a catalytic cracking unit (NCC) to process light naphtha-type feedstock (30–T_M °C), catalytic reformer (REF) for processing feedstock referred to as heavy naphtha (T_M °C–220 °C), and an aromatic complex (CA), to which are fed streams from catalytic reforming (REF) and fractions of 60+ streams from the NCC. Said method includes the sequence of the following operations: feeding naphtha feedstock with initial boiling point higher than or equal to 30 °C, and a final boiling point higher than or equal to 220 °C, into a hydrotreating unit (HDT), to remove sulphur and nitrogen compounds present in the feedstock, feeding the hydrotreated naphtha feedstock to a separation unit (SPLIT 1), which enables to separate a light fraction, called light naphtha, with a boiling range of 40–T_M °C, and a heavy fraction, called heavy naphtha, with a boiling range T_M–220 °C, where T_M °C ranges from 80 °C to 160 °C, preferably from 100 °C to 150 °C and very preferably from 110 °C to 140 °C, feeding light naphtha as feedstock into the NCC, feeding heavy naphtha as a feedstock to the catalytic reforming unit (REF), separation of the streams leaving the NCC in a fractionation unit (FRAC), which allows separating the light fraction fed for separation, called the cold box (SBF), which allows separation of H₂, CH₄ and light paraffins C2, C3 and C4, on one hand, and ethylene and propylene, on the other hand, feeding the heavy fraction leaving the separator (FRAC) mixed with catalytic reforming (REF) streams as feedstock to the aromatic complex (CA), collecting from the aromatic complex (CA) BTX, raffinate, defined as the non-aromatic part of the stream, at least part of which is fed in a mixture with light naphtha as feedstock for NCC, and a fraction, called heavy aromatics, which is also fed in a mixture with light naphtha as feedstock for NCC.

EFFECT: use of the invention allows to reduce the supply of heat from external sources.

7 cl, 4 dwg, 6 tbl, 3 ex