Patent ID: 11866396
Assignee: IFP ENERGIES NOUVELLES
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 14:
15. The process for producing olefins according to claim 1, which is performed on an apparatus for producing olefins having a number of carbon atoms of between 2 and 4 and aromatics by catalytic cracking, comprising the following units:
a naphtha catalytic cracking reactor (4) suitable for contacting some or all of a feedstock comprising naphtha (1), a catalyst (2) and a diluent (3), converting at least partly the naphtha-comprising feedstock (1) into olefins having a number of carbon atoms between 2 and 4, and producing a cracking effluent (6);
a first separating section (9) suitable for treating the cracking effluent (6) and producing at least the following fractions:
a fraction comprising ethylene (13),
a fraction comprising propylene (14), and
a fraction comprising compounds comprising at least 5 carbon atoms (16), comprising paraffins, olefins and aromatics;

a second separating section (24) suitable for treating at least part of the fraction comprising compounds comprising at least 5 carbon atoms (16), and producing the following fractions:
a fraction comprising compounds comprising 5 carbon atoms (25), and
a fraction comprising compounds comprising at least 6 carbon atoms (26) which is rich in aromatics;

an aromatics extraction unit (30) suitable for treating at least part of the fraction comprising compounds comprising at least 6 carbon atoms (26), and producing the following fractions:
an aromatics-enriched fraction (31), and
a low-aromatics fraction (32); and

an aromatics separation unit (33) suitable for treating at least part of the aromatics-enriched fraction (31), and producing at least the following fractions:
a benzene-rich fraction (34),
a toluene-rich fraction (35), and
at least one xylenes-rich fraction (36); and

a duct suitable for recycling at least partly the fraction comprising compounds comprising 5 carbon atoms (25) into the naphtha catalytic cracking reactor (4).