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

A technology for heavy naphtha and heavy aromatics, applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problem of low purity of light aromatics and achieve the effect of high aromatics content

Active Publication Date: 2021-02-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 n...

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 aromatic hydrocarbon from heavy aromatic hydrocarbon. The method mainly solves the problem of low naphtha aromatic hydrocarbon purity when aromatic hydrocarbon is used as a target product in the prior art. The method comprises the following steps: carrying out hydrofining on a catalytic diesel oil stream to separate impurities, carrying out a hydrocracking reaction, and separating after the reaction to obtain fractions comprising light hydrocarbons, heavy naphtha rich in light aromatic hydrocarbons and heavytail oil, wherein the hydrocracking catalyst comprises the following components in parts by weight: a2) 5-80 parts of solid acid zeolite, b2) 0.05 to 8 parts of a group VIII metal, c2) 3 to 25 partsof VIB group metal oxide, d2) 0.1 to 2 parts of VIB group metal sulfide, and e2) 20 to 95 parts of a first binder. The method can be used for producing heavy naphtha containing high-quality light aromatic hydrocarbons from catalytic cracking light diesel oil, solves the problem of low purity of hydrocracking aromatic hydrocarbons, and achieves a good technical effect.

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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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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