Method and system for preparing light aromatic hydrocarbon

A technology for light aromatic hydrocarbons and light hydrocarbons, which can be used in the treatment of hydrocarbon oil, hydrocarbon oil treatment products, petroleum industry, etc., and can solve the problems of low purity of light aromatic hydrocarbons.

Active Publication Date: 2021-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problem in the prior art that the purity of light aromatics in the heavy naphtha fraction is too low when the target prod

Method used

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  • Method and system for preparing light aromatic hydrocarbon
  • Method and system for preparing light aromatic hydrocarbon
  • Method and system for preparing light aromatic hydrocarbon

Examples

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Embodiment 1

[0140] Process flow: In this embodiment, the hydrocracking process flow of catalytic diesel to produce high-quality light aromatics is as follows: figure 1 shown. It includes separating fractions including dry gas, light hydrocarbons, heavy naphtha fractions and heavy tail oils after catalytic diesel is subjected to hydrofining, impurity separation, deep denitrogenation and hydrocracking reactions. The deep denitrification treatment in this embodiment adopts the catalytic denitrification method, and the denitrification device is a fixed-bed reaction system filled with a denitrification catalyst. The raw material oil is the same as the raw material oil 1 (catalyzed diesel oil 1) of Comparative Example 1.

[0141] catalyst:

[0142] The hydrofinishing catalyst is the same as the hydrofinishing catalyst A1 of comparative example 1, and the hydrofinishing catalyst A1' after presulfurization under the same conditions. The hydrorefining catalyst and reaction conditions are the sa...

Embodiment 2

[0162] Process flow: In this embodiment, the hydrocracking process flow of catalytic diesel to produce high-quality light aromatics is as follows: figure 1 shown. Including the separation of fractions including dry gas, light hydrocarbons, heavy naphtha fractions and heavy tail oils after catalytic diesel oil is subjected to hydrotreating, impurity separation, deep denitrogenation and hydrocracking reactions. The deep denitrification treatment in this embodiment adopts the method of catalytic denitrification, and the denitrification device is a fixed bed device filled with a denitrification catalyst.

[0163] The properties of the raw materials are shown in Table 11. The catalytic diesel aromatics content of the raw material oil 2 is 79.50wt%.

[0164] catalyst:

[0165] Hydrofining catalyst A2: 100g of pseudo-boehmite was added with 2g of turnip powder, 9ml of nitric acid and 60ml of water, kneaded into dough, extruded, kept at room temperature for 24h, dried at 100°C for 1...

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Abstract

The invention relates to a hydrocracking method and system for producing high-quality light aromatic hydrocarbon. The method mainly solves the problem of low arene purity when arene is used as a target product in the prior art. A catalytic diesel oil flow is subjected to hydrofining, impurity separation and deep denitrification, and then a hydrocracking reaction is carried out. After the reaction,fractions including light hydrocarbons, heavy naphtha rich in light aromatic hydrocarbons, and heavy tail oil are obtained through separation. The method can be used for producing heavy naphtha containing high-quality light aromatic hydrocarbons from catalytic diesel oil, solves the problem of low purity of aromatic hydrocarbons in a hydrocracking product of catalytic diesel oil, and achieves a good technical effect.

Description

technical field [0001] The invention relates to the technical field of hydrocracking, in particular to a hydrocracking method and system for producing high-quality light aromatics from catalytic diesel. Background technique [0002] In petrochemical plants, the aromatics complex usually uses p-xylene (co-production of o-xylene) as the target product to provide raw materials for the downstream PTA (xylene to produce purified terephthalic acid) unit. In addition to catalyzing xylenes in reformed oil and pyrolysis gasoline, it is mainly to disproportionate and transalkylate aromatic hydrocarbon raw materials such as toluene and C9 / C10 aromatics under the action of molecular sieve catalysts to generate mixed xylenes and benzene. The content of non-aromatics in the C9 / C10 heavy aromatics entering the disproportionation and transalkylation unit is required to be less than 0.5 wt%. Mixed xylenes are separated by crystallization or adsorption to produce p-xylene. The mixed xylene ...

Claims

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Application Information

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IPC IPC(8): C10G67/02
CPCC10G67/02C10G2300/4006C10G2300/4012C10G2300/4018C10G2300/70C10G2400/30
Inventor 郑均林孔德金宋奇姜向东侯敏祁晓岚
Owner CHINA PETROLEUM & CHEM CORP
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