Hydrogenation method for producing aromatics extraction raw material

A technology for aromatics extraction and raw materials, which is applied in the field of hydrogenation for processing high-diene gasoline fractions. It can solve the problems of gasoline fraction instability, reactor pressure drop rise, and high sulfur and nitrogen content, and achieve stable long-term operation and delay the top Effects of coking and prolonging the operating cycle

Active Publication Date: 2010-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, aromatic products have very strict restrictions on impurities such as sulfur and nitrogen. It is usually required that the sulfur content in the product is less than 1 μg / g, and the nitrogen content is less than 1 μg / g, and the extraction process cannot remove impurities such as sulfur and nitrogen. Therefore, it is necessary to remove DCC Impurities such as sulfur and nitrogen in gasoline provide qualified raw materials for aromatics extraction units
[0004] According to the existing hydrofining technology, there are many problems in directly desulfurizing and denitrifying DCC gasoline: due to the high diene content in DCC gasoline, it is easy to polymerize and coke at the top of the catalyst bed, resulting in an increase in the pressure drop of the reactor. Greatly affect the long-term stable operation of the device
However, the high content of dienes and gums makes this gasoline fraction extremely unstable
[0007] CN1990830A discloses a coker gasoline hydrofining method, the method is first contacted with a hydrogenation protecting agent at a low temperature, and then contacted with a hydrofinishing catalyst at a high temperature, the olefin content in the refined gasoline fraction is less than 1% by volume, The sulfur content is less than 300μg / g, and the nitrogen content is less than 2μg / g, both of which can meet the feed requirements of the reforming prehydrogenation unit and steam cracking ethylene unit. This process can delay the pressure drop of the reactor and prolong the refueling of coker gasoline. Hydrogen unit operating cycle, but the content of sulfur and nitrogen in coked gasoline is still high after treatment, and further treatment is needed

Method used

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  • Hydrogenation method for producing aromatics extraction raw material
  • Hydrogenation method for producing aromatics extraction raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A catalytic cracking gasoline is used as raw material A, and the properties are shown in Table 1. Feed oil A and hydrogen into the first reactor (one reverse) and sequentially contact with the hydrogenation protection agents A, B, and C to remove diolefins at 180°C, and the reaction effluent is in the second reactor (two reverse) After contacting with the hydrofining preparation RS-1, the hydrofining reaction is carried out at 300°C. The reaction effluent is cooled and separated and then enters the stabilization tower, and the final liquid phase product is obtained from the stabilization tower bottom. Based on the overall catalyst of the first reactor, the filling volume percentages of the hydrogenation protection agent A, the hydrogenation protection agent B and the hydrogenation protection agent C are 20 volume %, 40 volume% and 40 volume% respectively. The hydrogenation process conditions and product properties are shown in Table 2.

[0040] It can be seen from Table 2...

Embodiment 2

[0042] Using a catalytic cracking gasoline as raw material B, the properties are shown in Table 1. Feed oil A and hydrogen into the first reactor (one reverse) and sequentially contact with the hydrogenation protective agents A, B, and C to remove diolefins at 160°C, and the reaction effluent is in the second reactor (two reverse) After contacting with the hydrofining preparation RS-1, the hydrofining reaction is carried out at 310°C. The reaction effluent enters the stabilization tower after cooling and separation, and the final liquid phase product is obtained from the stabilization tower bottom. Based on the overall catalyst of the first reactor, the filling volume percentages of the hydrogenation protection agent A, the hydrogenation protection agent B, and the hydrogenation protection agent C are 18 vol%, 36 vol% and 46 vol%, respectively. The hydrogenation process conditions and product properties are shown in Table 2.

[0043] The hydrogenation process conditions and prod...

Embodiment 3

[0047] The raw materials are the same as those used in Example 1, and the properties are shown in Table 1. The process flow and process conditions are the same as in Example 1. The device has been operated for a long time, and the stability of the device has been investigated. The results are shown in Table 3. It can be seen from Table 3 that the laboratory device still has no pressure difference after 1500h of stable operation, indicating that the method provided by this patent can process high diene worth gasoline raw materials and still ensure the long-term stable operation of the device.

[0048] Table 1

[0049] raw material name

[0050] Table 2

[0051] Process conditions

[0052] Process conditions

[0053] table 3

[0054] Process conditions

[0055] Process conditions

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Abstract

The invention relates to a hydrogenation method for producing an aromatics extraction raw material. The method adopts two hydrogenation units and performs different reactions at different temperatures, wherein the first hydrogenation unit is filled with protective agents with different specifications in a graded loading mode; the protective agents are mainly used for removing diene, delaying the coking of the top part of a catalyst bed layer and prolonging the running period of a device at a low temperature; the second hydrogenation unit is filled with a hydrorefining catalyst for desulfurization, denitrification and alkene saturation at a high temperature and alkene saturation as little as possible. The hydrogenation method broadens the source of the aromatics extraction raw material; through the method provided by the invention, gasoline fractions with high diene value content and high impurity content can be converted; and the obtained product has the nitrogen content and the sulphur content of less than 1 mu g/g, and the bromine value of less than 0.5 gBr/100g so as to meet the requirement of an aromatics extraction device on feeding.

Description

Technical field [0001] The invention belongs to a method for refining hydrocarbon oil in the presence of hydrogen, and more specifically, it is a hydrogenation method for processing high diene gasoline fractions. The product obtained by the method is a raw material for aromatic extraction. Background technique [0002] With the continuous development of the petrochemical and textile industries, the world's demand for aromatic products continues to grow, especially for benzene and xylene. For a long time, the output of my country's aromatic products has been unable to meet demand. At present, most of the sources of aromatics are gasoline produced by the catalytic reformer unit of the refinery and pyrolysis gasoline produced by the ethylene unit. The method of separating aromatics from these two gasolines is mainly solvent extraction. Therefore, how to broaden the source of aromatics extraction raw materials is a problem that needs to be solved. [0003] Catalytic cracking (DCC) pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/06
Inventor 高晓冬习远兵何宗付夏国富聂红
Owner CHINA PETROLEUM & CHEM CORP
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