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Method for producing small-molecule aromatics from diesel oil raw material

A raw material and diesel technology, applied in the field of hydrocarbon oil cracking, can solve the problem of low octane number of gasoline fraction, and achieve the effect of excellent ring-opening cracking function

Active Publication Date: 2016-02-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the hydrocracking process can maximize the production of gasoline and high-quality diesel products, the gasoline fraction produced has a lower octane number

Method used

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  • Method for producing small-molecule aromatics from diesel oil raw material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The feed oil F enters the hydrorefining reaction zone together with the hydrogen, contacts and reacts with the protective agent A and the hydrofinishing catalyst B, and the reaction effluent from the hydrofinishing reaction zone enters the hydrocracking reaction zone I without any intermediate separation. The first hydrocracking catalyst C contacts and reacts. The reaction effluent from hydrocracking reaction zone I enters the separation facilities such as cold high-pressure separator I, cold low-pressure separator, and fractionation tower in sequence, and obtains light gasoline fraction, heavy gasoline fraction, middle distillate and tail oil after cooling, separation, and fractionation fraction. All tail oil fractions are recycled to hydrocracking reaction zone I to continue cracking and conversion.

[0056] The heavy naphtha enters the desulfurization unit, contacts and reacts with the desulfurization catalyst, removes thiophenes and mercaptans, and then enters the ...

Embodiment 2

[0060] The feed oil F enters the hydrorefining reaction zone together with the hydrogen, contacts and reacts with the protective agent A and the hydrofinishing catalyst B, and the reaction effluent from the hydrofinishing reaction zone enters the hydrocracking reaction zone I without any intermediate separation. The first hydrocracking catalyst C is contacted for reaction. The reaction effluent from hydrocracking reaction zone I enters the separation facilities such as cold high-pressure separator I, cold low-pressure separator, and fractionation tower in sequence, and obtains light gasoline fraction, heavy gasoline fraction, middle distillate and tail oil after cooling, separation, and fractionation fraction. Among them, 50% by weight of the tail oil fraction is used as a low-sulfur diesel blending component, and the remaining part of the tail oil fraction is recycled to the hydrocracking reaction zone I for further cracking conversion.

[0061] The heavy gasoline fraction e...

Embodiment 3

[0065] The raw material oil G enters the hydrofinishing reaction zone together with the hydrogen, contacts and reacts with the protective agent A and the hydrofinishing catalyst B, and the reaction effluent from the hydrofinishing reaction zone enters the hydrocracking reaction zone I without any intermediate separation, and The first hydrocracking catalyst C contacts and reacts. The reaction effluent from hydrocracking reaction zone I enters the separation facilities such as cold high-pressure separator I, cold low-pressure separator, and fractionation tower in sequence, and obtains light gasoline fraction, heavy gasoline fraction, middle distillate and tail oil after cooling, separation, and fractionation fraction. All tail oil fractions are recycled to hydrocracking reaction zone I to continue cracking and conversion.

[0066] The heavy naphtha enters the desulfurization unit, contacts and reacts with the desulfurization catalyst, removes thiophene and mercaptan, and then ...

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Abstract

The invention provides a method for producing small-molecule aromatics from a diesel oil raw material. According to the method, the inferior diesel oil raw material is subjected to reactions in a hydrofining reaction zone and a hydrocracking reaction zone I, and then a light gasoline fraction, a heavy naphtha gasoline fraction, an intermediate fraction and a tail oil fraction are obtained through separation and fractionation; the intermediate fraction enters a hydrocracking reaction zone II for a contact reaction with a second hydrocracking catalyst; the heavy gasoline fraction enters to a desulfurization reaction zone for further deep desulfurization, namely removal of thiofuran and mercaptan; after the removal is finished, the heavy gasoline fraction without thiofuran and mercaptan enters an aromatics extraction unit, and such small-molecule aromatics as benzene, toluene and dimethyl benzene are obtained through separation. Through adoption of the method, the inferior diesel oil raw materials can be effectively converted into benzene, toluene, dimethyl benzene and other high-value products; meanwhile, the blending components of part of light gasoline and low-sulfur diesel oil can be produced according to the method.

Description

technical field [0001] The invention relates to a hydrocarbon oil cracking method for obtaining low-boiling fractions in the presence of hydrogen, more specifically, a method for processing high-aromatic hydrocarbons and low-cetane number inferior diesel raw materials to produce benzene, toluene and xylene, etc. A method for small molecule aromatics. Background technique [0002] As crude oil becomes heavier and worse, the quality of catalytic cracking diesel is getting worse and the output is gradually increasing. In recent years, in order to increase the yield of light oil, the processing capacity and processing depth of the catalytic cracking unit in the refinery have been continuously improved, which has further led to an increase in the output of catalytic cracking diesel and a deterioration in its quality. This part of low-quality FCC diesel has the characteristics of high density, high aromatic content and low cetane number. In addition, in order to increase the out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02C07C4/18C07C15/04C07C15/06C07C15/08
Inventor 张毓莹蒋东红梁家林任亮辛靖王锦业
Owner CHINA PETROLEUM & CHEM CORP
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