Method for hydro-conversion of high aromatic oil through two-stage process

Abstract

The invention discloses a method for hydro-conversion of high aromatic oil through a two-stage process. In the method, first-stage hydrogenated oil heavy-cracking stock passes through a second-stage first reaction zone 2R1 (a high-boiling point fraction hydrocracking reaction zone) and a second-stage combined hydrocracking reaction zone 2RU (a low-boiling point fraction cracking reaction zone), which are connected in series, to alleviate secondary cracking reaction; first-stage hydrogenated oil light-cracking stock 1LBO (light wax oil fractions and / or heavy diesel oil fractions) is introduced into the reaction zone 2RU; first-stage hydrogenation effluent and second-stage hydrogenation effluent can be respectively or jointly separated; second-stage hydrogenated oil heavy-cracking stock can be introduced into 2R1; and second-stage hydrogenated oil light-cracking stock can be introduced into 2RU for realizing cycled cracking. The method is especially suitable for the hydro-conversion process for preparing high-quality diesel oil components by taking medium-temperature coal tar, or medium-temperature coal tar heavy fractions or anthracene oil as a raw material.

Description

technical field [0001] The present invention relates to a two-stage method for hydrogenation conversion of high aromatic hydrocarbon oil. The high-boiling point cracking raw material of oil produced by one-stage hydrogenation passes through the first reaction zone 2R1 (high-boiling point wax oil distillation cracking reaction zone) and the second stage in series in the second stage. 2RU (low-boiling point wax oil distillation cracking reaction zone) in the first-stage combined hydrocracking reaction zone, and 1LBO (low-boiling point wax oil fraction and or heavy diesel oil fraction) introduced into the second-stage combined hydrocracking reaction zone 2RU; the high-boiling-point cracking feedstock for the oil produced by the second-stage hydrogenation is introduced into 2R1, and the low-boiling-point cracking feedstock for the oil produced by the second-stage hydrogenation is introduced into the second reaction zone 2RU of the second stage to realize circular cracking. In part...

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Problems solved by technology

[0003] ①According to the joint processing technology plan, the mixture of heavy wax oil components and light wax oil components in the oil produced by one-stage hydrofining enters the same hydrocracking reaction zone, and the same hydrocracking catalyst must be used, and it is impossible to treat the heavy wax oil components at the same time. The wax oil component and the light wax oil component constitute the best operating conditions. While completing the hydrocracking of the heavy wax oil component of the first-stage hydrorefining to produce diesel oil, it will inevitably cause the light gas oil component of the first-stage hydrotreating The excessive cracking of the catalyst (because the catalyst cracking activity is relatively high, the reaction temperature is relatively high, and the catalyst space velocity is relatively low), which will increase the additional hydrogen consumption and reduce the yield of diesel oil; especially for the yield of light wax oil in the oil produced by hydrorefining In the case of high temperature (such as medium temperature tar hydrorefining oil), this shortcoming is more significant;

[0004] ② According to the independent processing technology plan, construct two sets of equipment, the project investment is huge, especially when the scale of the equipment is small, this shortcoming is more obvious

[0005] The high-aromatic oil two-stage hydrogenation conversion method of the technical scheme of the present invention has no report

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