Method and system for producing heavy naphtha rich in light aromatics from heavy aromatics

A technology for light aromatics and heavy aromatics, applied in the treatment of hydrocarbon oil, petroleum industry, hydrotreating process, etc., can solve the problems of low purity of light aromatics, improve yield, reduce aromatics loss, reduce hydrogen consumption effect

Active Publication Date: 2021-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problem in the prior art that the purity of light aromatics in heavy naphtha fractions is too low when light aromatics are used as target products, the present invention provides a method for producing heavy naphtha rich in light aromatics from heavy aromatics. Aromatic raw materials are sequentially hydrotreated and selectively converted to produce heavy naphtha with high purity light aromatics, and good technical results have been achieved

Method used

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  • Method and system for producing heavy naphtha rich in light aromatics from heavy aromatics
  • Method and system for producing heavy naphtha rich in light aromatics from heavy aromatics
  • Method and system for producing heavy naphtha rich in light aromatics from heavy aromatics

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Embodiment 1

[0129] Process flow: In this embodiment, the process flow for producing heavy naphtha rich in light aromatic hydrocarbons by catalytic diesel oil is as follows: figure 1 shown. Including the separation of fractions including dry gas, light hydrocarbons, heavy naphtha fractions and heavy tail oil after catalytic diesel is hydrorefined, separated from impurities, and hydrocracked, and part of the heavy tail oil > 210°C is recycled back to the hydrotreating unit. The raw material oil is the same as that of comparative example 1 raw material oil 1 (catalytic diesel oil).

[0130] catalyst:

[0131] 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 same as in Comparative Example 1 (see Table 2).

[0132] Hydrocracking catalyst B2:

[0133] 70wt% beta zeolite (silicon-aluminum molecular...

Embodiment 2

[0150] Process flow: In this embodiment, the process flow for producing heavy naphtha rich in light aromatic hydrocarbons by catalytic diesel oil is as follows: figure 1 shown. Including the separation of fractions including dry gas, light hydrocarbons, heavy naphtha fractions and heavy tail oil after catalytic diesel is hydrorefined, separated from impurities, and hydrocracked, and part of the heavy tail oil > 210°C is recycled back to the hydrotreating unit. The properties of the raw materials are shown in Table 10. The catalytic diesel aromatics content of the raw material oil 2 is 79.50wt%.

[0151] catalyst:

[0152] Hydrofining Catalyst A2: 100g of pseudo-boehmite, add 2g of fenugreek powder, 9ml of nitric acid and 60ml of water, knead into a dough, extrude, keep at room temperature for 24h, dry at 100°C for 12h, and roast at 550°C for 3h in air atmosphere A hydrorefining catalyst carrier is obtained. 10.32g of nickel nitrate hexahydrate, 20.96g of ammonium molybdate...

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Abstract

The invention relates to a method and system for producing heavy naphtha rich in light aromatics from heavy aromatics. It mainly solves the problem that the purity of naphtha aromatics is not high when the previous technology takes aromatics as the target product. In the present invention, the hydrocracking reaction is carried out after the catalytic diesel stream is subjected to hydrotreating to separate impurities, and fractions including light hydrocarbons, heavy naphtha rich in light aromatics and heavy tail oil are separated after the reaction; In parts, the hydrocracking catalyst includes: a 2 )5~80 parts of solid acid zeolite; b 2 ) 0.05 to 8 parts of Group VIII metals; c 2 )3~25 parts VIB group metal oxides; d 2 ) 0.1 to 2 parts of VIB group metal sulfides; e 2 ) 20 to 95 parts of the first binder. It can be used to produce heavy naphtha containing high-quality light aromatics from catalytic cracking light diesel oil, solves the problem of low purity of hydrocracking aromatics, and achieves good technical results.

Description

technical field [0001] The invention relates to the technical field of petroleum catalytic cracking, in particular to a hydrocracking method and system for producing heavy naphtha rich in light aromatics from heavy aromatics. Background technique [0002] Benzene and p-xylene (PX) are important basic organic chemical raw materials, which are widely used in the production of polyester, chemical fiber and other products. They are closely related to the development of the national economy and people's basic necessities of life. The demand has been strong and increasing rapidly in recent years. There are two main process routes for the source of aromatics raw materials: one raw material route is to obtain aromatics raw materials through catalytic reforming of naphtha and extraction of aromatics; the other raw material route is to hydrogenate pyrolysis gasoline, a by-product of the ethylene plant, and extract aromatics Obtain aromatic hydrocarbon raw materials, so as to convert l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/14
CPCC10G67/14C10G2300/1048C10G2300/1055C10G2300/1059
Inventor 郑均林宋奇姜向东
Owner CHINA PETROLEUM & CHEM CORP
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