Method and system for treating hydrocarbon-containing mixture

A method for processing a hydrocarbon-containing mixture, comprising the steps of:

• I) separating the hydrocarbon-containing mixture into a light fraction and a heavy fraction, wherein the light fraction is a C7− component and the heavy fraction is a C8+ component or the light fraction is a C5− component and the heavy fraction is a C6+ component;
• II) reacting the light fraction from step I) in the presence of an aromatization catalyst in an aromatization unit and separating the resulting reaction product into a C5− component and a C6+ component, wherein the reaction occurring in the aromatization unit includes an aromatization reaction;
• III) reacting the heavy fraction from step I) and the C6+ component from step II) in the presence of an aromatics conversion catalyst in an aromatics conversion unit and separating the resulting reaction product into a C5− fraction, a C6-C7 component, a C8 component, and a C9+ component, wherein the reaction occurring in the aromatics conversion unit includes a transalkylation reaction;
• and
• IV) catalytically cracking at least a part of one or both of the C5− component from step II) and the C5− component from step III), or subjecting the at least a part of one or both of the C5− component from step II) and the C5− component from step III) hydrogenation saturation followed by steam cracking,
• wherein the aromatics conversion catalyst used in the aromatics conversion unit of step III) comprises a molecular sieve component, an active metal component immobilized on the molecular sieve component, and an oxide additive, the aromatics conversion catalyst has a mediate strong acid content of 0.05-2.0 mmol/g catalyst, and a ratio of the mediate strong acid content to the total acid content of 60-99%, and
• wherein the molecular sieve component is selected from MCM-22 molecular sieves, MOR molecular sieves, ZSM-12 molecular sieves, and combinations thereof;
• the active metal in the active metal component is selected from Group VB metals, Group VIB metals, Group VIIB metals, and combinations thereof;
• and the oxide additive is selected from alumina, silica, magnesia, titania, zirconia, kaolin, and combinations thereof.