A hydrocracking method for producing chemical raw materials

Abstract

A hydrocracking method for producing chemical raw materials, the method comprising: in the presence of hydrogen, raw oil enters a hydrorefining reaction zone and a hydrocracking reaction zone successively for hydrogenation reaction, and the obtained reaction product is subjected to gas-liquid separation and After fractionation, light naphtha fraction, heavy naphtha fraction, diesel oil fraction and tail oil fraction are obtained, the hydrofinishing reaction zone is filled with a hydrofinishing catalyst, and the hydrocracking reaction zone is filled with a hydrocracking catalyst, wherein the The hydrogen partial pressure in the hydrocracking reaction zone is 20-80% of the hydrogen partial pressure in the hydrofinishing reaction zone, and the hydrogen partial pressure range in the hydrofinishing reaction zone is 12-20MPa. By adopting the method provided by the invention, the yield of heavy naphtha can be greatly increased, and at the same time, high-quality tail oil fractions can be produced.

Description

technical field [0001] The invention relates to the field of hydrocracking, in particular to a hydrocracking method for producing chemical raw materials. Background technique [0002] Ethylene is the basic raw material of petrochemical industry. With the development of the national economy, my country's ethylene production capacity has increased rapidly, but it still cannot meet the demand for ethylene in the domestic market, and about half of it depends on imports. Therefore, the development of petrochemical basic raw material olefin production increase technology is a direction of petrochemical industry development. [0003] Hydrocarbon steam cracking is the main means of producing ethylene. In the process of steam cracking to ethylene production, the cost of feedstock oil accounts for a large proportion of the total cost, generally more than 60%. Therefore, the optimal selection of feedstock oil is an important factor affecting the efficiency of ethylene plants. From a...

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Problems solved by technology

[0015] (1) The yield of heavy naphtha under the one-pass process is not enough to meet the product demand of the enterprise;

[0016] (2) After ensuring that the yield of heavy naphtha meets the requirements of the enterprise, the yield of light naphtha or light hydrocarbons is relatively high;

[0018] (4) Circulating diesel oil or middle distillate oil to the second cracking reactor is equivalent to adding a section of hydrocracking unit, requiring additional reactors and circulating hydrogen systems, increasing the complexity of the device and increasing the investment

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