Hydrocracking method capable of producing heavy naphtha and tail oil

Abstract

The invention relates to the field of coal chemical industry and discloses a hydrocracking method capable of producing heavy naphtha and tail oil. The method comprises the steps as follows: raw oil sequentially passes through a hydrofining reactor and a first hydrocracking reactor for reactions in the presence of hydrogen, and a hydrocracked effluent is obtained; then, the hydrocracked effluent isintroduced into a separation device to be sequentially subjected to gas-liquid separation and fractionation, and a light naphtha fraction, a heavy naphtha fraction, a kerosene fraction, a diesel fraction and a tail oil fraction are obtained; at least part of kerosene fraction and / or at least part of diesel fraction are / is introduced into a first catalyst bed of the hydrocracking reactor to be circulated. The method is convenient, low in energy consumption and hydrogen consumption and capable of producing high-quality tail oil and heavy naphtha products.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a hydrocracking method for concurrently producing heavy naphtha and tail oil. 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 still depends on imports. Therefore, it is an important direction for the development of the petrochemical industry to develop the technology for increasing the production of olefins, the basic raw material of petrochemical industry. [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 feed...

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Problems solved by technology

[0014] However, for enterprises that need to simultaneously produce heavy naphtha and high-quality product tail oil, the above-mentioned scheme has shortcomings: (1) the yield of heavy naphtha under the one-pass process is not enough to meet the product demand of the enterprise; (2) the diesel oil Or the circulation of middle distillates to the second cracking reactor is equivalent to adding a section of hydrocracking unit, which requires additional reactors and circulating hydrogen systems, and the original circulating hydrogen system needs to be modified. This part is relatively expensive and relatively expensive. Big

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