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Method for producing benzene, toluene and xylene from poor-quality diesel oil raw material

A low-quality diesel and xylene technology, applied in the field of hydrocarbon oil cracking, can solve the problem of low octane number of gasoline fractions, and achieve the effects of good synergy, excellent selectivity and excellent selectivity

Active Publication Date: 2016-02-10
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 benzene, toluene and xylene from poor-quality diesel oil raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 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. After the reaction effluent of hydrocracking reaction zone I is mixed with middle distillate and hydrogen-rich gas, it enters hydrocracking reaction zone II, contacts and reacts with the second hydrocracking catalyst D, and breaks the alkyl side chain, and takes into account the Selective ring-opening cracking of tetrahydronaphthalene monocyclic aromatics. The reaction effluent from hydrocracking reaction zone II enters the separation facilities such as cold high-pressure separator, cold low-pressure separator, fractionation tower, etc. in turn, and obtains light gasoline fraction, heavy gasoline fraction, middle ...

Embodiment 2

[0056] 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. After the reaction effluent of hydrocracking reaction zone I is mixed with middle distillate and hydrogen-rich gas, it enters hydrocracking reaction zone II, contacts and reacts with the second hydrocracking catalyst D, and breaks the alkyl side chain, and takes into account the Selective ring-opening cracking of tetrahydronaphthalene monocyclic aromatics. The reaction effluent from hydrocracking reaction zone II enters the separation facilities such as cold high-pressure separator, cold low-pressure separator, fractionation tower, etc. in turn, and obtains light gasoline fraction, heavy gasoline fraction, middle ...

Embodiment 3

[0060] 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. After the reaction effluent of hydrocracking reaction zone I is mixed with middle distillate and hydrogen-rich gas, it enters hydrocracking reaction zone II, contacts and reacts with the second hydrocracking catalyst D, and breaks the alkyl side chain, and takes into account the Selective ring-opening cracking of tetrahydronaphthalene monocyclic aromatics. The reaction effluent from hydrocracking reaction zone II enters the separation facilities such as cold high-pressure separator, cold low-pressure separator, and fractionation tower in turn, and after cooling, separation, and fractionation, light ga...

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Abstract

The invention relates to a method for producing benzene, toluene and xylene from a poor-quality diesel oil raw material. According to the method, a poor-quality diesel oil raw material reacts in a hydrorefining zone, a hydrocracking reaction zone I and a hydrocracking reaction zone II to generate a stream being rich in benzene, toluene and xylene, the reaction products of the hydrocracking reaction zone I are subjected to fractionation to separate so as to obtain the light gasoline distillate, the heavy gasoline distillate, the middle distillate and the tail gasoline distillate, thiophene, mercaptan and the like are removed from the heavy gasoline through a desulfurization reaction zone, and separation is performed to obtain the high added value products such as benzene, toluene and xylene, raffinate oil, and the like. With the method of the present invention, the poor-quality diesel oil raw material can be effectively converted into the high added value products such as benzene, toluene, xylene and the like while the partial light gasoline and the low sulfur diesel oil blending component can be concurrently produced.

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. Methods of BTX components. 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 output of vehic...

Claims

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Application Information

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IPC IPC(8): C10G67/02C07C4/18C07C15/04C07C15/06C07C15/08
Inventor 张毓莹蒋东红任亮梁家林辛靖王锦业胡志海
Owner CHINA PETROLEUM & CHEM CORP
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