Petroleum hydrocarbon catalytic conversion method

Abstract

The invention discloses a petroleum hydrocarbon catalytic conversion method. The petroleum hydrocarbon catalytic conversion method comprises the following steps that raw oil contacts a mesoporous zeolite-rich catalyst in a first reaction zone of a reactor and undergo a cracking reaction; a reactant flow and a part of the raw oil are fed into a second reaction zone of the reactor and further undergo a cracking reaction; reaction oil gas and a catalyst needing to be regenerated are separated out, wherein the catalyst needing to be regenerated is subjected to steam stripping and burning regeneration and then is fed back to the reactor; the reaction oil gas is subjected to separation to form a desired ethane product, propylene and aromatic hydrocarbon-rich catalytic gasoline; the aromatic hydrocarbon-rich catalytic gasoline is subjected to selective hydrogenation and then is fed into a aromatic hydrocarbon extraction device to produce a desired light aromatic hydrocarbon product by separation; and the extract oil obtained by the previous step is fed back to the first reaction zone of the reactor. Through petroleum hydrocarbon catalytic conversion method, an ethene yield is 22.43 wt%; a propylene yield is 33.22 wt%; and a benzene-toluene-xylene mixture yield is 25.28 wt%.

Description

Technical field [0001] The invention provides a method for catalytic conversion of petroleum hydrocarbons on the basis of the prior art, in particular a method for converting heavy raw materials into low-carbon olefins such as ethylene and propylene, and simultaneously producing light aromatics, thereby realizing efficient utilization of petroleum resources. Background technique [0002] Ethylene is one of the most important basic raw materials in the petrochemical industry. A series of extremely valuable derivatives can be obtained through ethylene polymerization, alkylation with benzene, and addition reactions with water, oxygen and halogen. The world ethylene industry continues to maintain a steady development trend. It is estimated that from 2007 to 2012, the world will add 38.78 million tons of ethylene capacity per year, with an average annual growth rate of 5.6%. By 2012, the world's ethylene production capacity will reach 162.67 million tons per year. At present, about 9...

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Problems solved by technology

[0014] There are two deficiencies in the above-mentioned prior art: one is that the potential content of aromatics in gasoline is not fully utilized while producing low-carbon olefins; the other is that th...

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