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Method for processing heavy diesel oil

A diesel and heavy-weight technology, applied in the field of oil refining, can solve the problem of difficult to guarantee the operation cycle of the device, and achieve the effects of long operation cycle of the device, high gasoline yield and high content of aromatics.

Active Publication Date: 2021-02-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] It can be seen from the above prior art that the catalytic diesel oil needs to be pre-cut into light catalytic diesel and heavy catalytic diesel before processing the catalytic diesel raw material. It is difficult to guarantee the operation period of the device due to the influence of polycyclic aromatic hydrocarbon carbon deposition on the life of the catalyst

Method used

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  • Method for processing heavy diesel oil
  • Method for processing heavy diesel oil
  • Method for processing heavy diesel oil

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specific Embodiment approach

[0044] The first type: preferably in step (3), a part of the light hydrogenated diesel oil is introduced into the hydrocracking reactor to carry out the second contact reaction with the hydrocracking catalyst contained therein, and the remaining part of the light hydrogenated diesel oil As the hydro-upgraded diesel output device, and the liquid effluent from the hydrocracking reactor in step (4) is introduced into step (2), to be combined with the liquid effluent from the step (2) The liquid effluents in the hydrofinishing reactor are introduced together into the same separation and fractionation system for separation and fractionation.

[0045] In the first preferred embodiment, the light hydrogenated diesel introduced into the hydrocracking reactor is 20-50% by weight of the heavy diesel feedstock in step (1).

[0046] The second type: preferably in step (3), all of the light hydrogenated diesel oil is introduced into the hydrocracking reactor to carry out the second contact...

Embodiment 1

[0091] use figure 1 The process shown treats feed oil D.

[0092] The raw oil D is firstly contacted with the hydrofinishing catalyst A through the hydrofinishing reactor, and the heavy hydrogenated diesel oil fraction with a boiling point higher than 320°C is mixed with hydrogen and then refined back to the hydrofinishing reactor, wherein the content of single-ring aromatics is 66% by weight %, the proportion of back refining accounts for 20% by weight of the stock oil D. Part of the light hydrogenated diesel fraction with a boiling point less than 320°C is mixed with circulating hydrogen and then enters the hydrocracking reactor to contact with hydrocracking catalyst C. The circulation ratio accounts for 35% by weight of the feed oil D. , Fractional distillation to obtain light naphtha, gasoline fraction and hydrotreated diesel oil. Concrete reaction conditions are shown in Table 2, and product yield and properties are shown in Table 3.

Embodiment 2

[0097] use figure 1 The process shown treats feed oil E.

[0098] The raw material oil E is firstly contacted with the hydrofinishing catalyst A through the hydrofinishing reactor, and the heavy hydrogenated diesel oil fraction with a boiling point higher than 330°C is mixed with hydrogen and then returned to the hydrofinishing reactor. 15% by weight. Part of the light hydrogenated diesel fraction with a boiling point less than 330°C is mixed with circulating hydrogen and enters the hydrocracking reactor to contact with hydrocracking catalyst C. The circulation ratio accounts for 25% by weight of the feed oil E. , Fractional distillation to obtain light naphtha, gasoline fraction and hydrotreated diesel oil. Concrete reaction conditions are shown in Table 2, and product yield and properties are shown in Table 3.

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Abstract

The invention relates to the field of oil refining, and discloses a method for processing heavy diesel oil. The method comprises: (1) in the presence of hydrogen, introducing heavy diesel raw material into a hydrotreating reactor to carry out the first contact reaction; (2) The liquid effluent from the hydrotreating reactor is introduced into a separation and fractionation system for separation and fractionation to obtain light hydrogenated diesel oil and heavy hydrogenated diesel oil; (3) recycle part of the heavy hydrogenated diesel oil to the refining The reactor inlet is used to carry out the first contact reaction together with the heavy diesel feedstock; at the same time, at least part of the light hydrogenated diesel oil is introduced into the hydrocracking reactor for the second contact reaction; (4) The liquid effluent from the hydrocracking reactor is separated and fractionated to obtain hydro-upgraded diesel. The method of the invention can obtain high-octane gasoline components and / or BTX chemical raw materials, and the method of the invention has the advantage of long operating period of the device.

Description

technical field [0001] The invention relates to the field of oil refining, in particular to a method for processing heavy diesel oil. Background technique [0002] With the aggravation of heavy and inferior crude oil, the quality of FCC diesel is deteriorating and the output demand is increasing year by year. This part of FCC diesel accounts for about one-third of my country's commercial diesel. [0003] At present, in order to extract more light oil products from crude oil, refineries continue to increase the processing capacity and processing depth of catalytic cracking units, resulting in further deterioration of the quality of catalytic cracking diesel oil, which is mainly manifested in high content of aromatics, sulfur and nitrogen High impurity content and low cetane number. At the same time, with the increasingly stringent environmental protection legislation, the national V vehicle diesel standard requires that the cetane number is not less than 51, the sulfur conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/02
CPCC10G67/02C10G2300/10C10G2300/201C10G2300/70
Inventor 赵广乐孟勇新李明丰任亮赵阳杨平胡志海
Owner CHINA PETROLEUM & CHEM CORP
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