Method for converting C9+ heavy arenes into light arenes

Abstract

The invention discloses a method for converting C9+ heavy arenes into light arenes, which comprises: reacting the C9+ heavy arenes by contacting the C9+ heavy arenes with an iridium-containing catalyst at 450 to 500 DEG C in the presence of hydrogen, and reacting the product of the primary reaction by contacting the product with a zeolite-containing catalyst at 380 to 420 DEG C in the presence of hydrogen, wherein the iridium-containing catalyst comprises a high-temperature resistant organic oxide carrier as well as iridium in an amount which is 0.01 to 2.0 mass percent based on the mass of the carrier and halogen in an amount which is 0.01 to 3.0 mass percent based on the mass of the carrier; and the zeolite-containing catalyst comprises a zeolite-containing carrier and a metal of the platinum group in an amount which is 0.01 to 2.0 mass percent based on the mass of the carrier. When the method is used, the total hydrogen consumption of the reaction system is reduced, the selectivity of dimethylbenzene is improved, the aromatic ring loss is reduced, the carbon accumulation rate of the zeolite catalyst is reduced greatly and the operation cycle of the reaction system is prolonged.

Description

technical field

[0001] The invention is a method for lightening heavy aromatic hydrocarbons, specifically, a method for converting C 9 + A method for producing benzene, toluene and xylene by lightening heavy aromatics. Background technique

[0002] Heavy aromatics generally refer to catalytic reforming, disproportionation and isomerization reactions to generate oil and C contained in ethylene cracking hydrogenated gasoline 9 ~C 16 mono- and bicycloalkylaromatics. For a long time, heavy aromatic resources have not been rationally and fully utilized, except for a small amount used as solvent and extraction of C 9 、C 10 Except for monomeric aromatics, they are generally directly blended into gasoline pools as fuel. However, it is not advisable to directly use heavy aromatics as fuels from both economic and environmental point of view. On the one hand, heavy aromatics can be converted into light aromatics such as benzene, toluene, and xylene (BTX); pollution, and conside...

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