Alternated fixed-bed residual oil hydrotreatment method and system

A technology of hydrotreating and hydrotreating, which is applied in hydrotreating process, treating hydrocarbon oil, petroleum industry, etc., can solve the problem of insufficient capacity of scale and impurity tolerance, rapid rise of pressure drop in hydrotreating pretreatment reactor, and adverse effects of Refinery economic efficiency and other issues, to achieve the effect of long-term operation

Active Publication Date: 2019-11-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after parallel and series operation, the method needs to stop and replace the catalysts of each hydrogenation pretreatment reactor, and requires a long shutdown time, and cannot continue hydrogenation of residual oil for a long time, thereby affecting the economic efficiency of the refinery; , the pressure drop of each hydrogenation pretreatment reactor is at the highest level in the late stage of operation, and it is also operated in series, which makes the total pressure drop of hydrogenation pretreatment very high. If the original operating conditions are maintained, it will affect the main The catalytic activity of the catalyst, this loss of catalytic activity is irreversible
In order to ensure the catalytic activity of the main catalyst, it is necessary to further increase the reaction severity of the front hydrogenation pretreatment and increase the reaction temperature to a greater extent, which will increase the load on the heating fu

Method used

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  • Alternated fixed-bed residual oil hydrotreatment method and system
  • Alternated fixed-bed residual oil hydrotreatment method and system
  • Alternated fixed-bed residual oil hydrotreatment method and system

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0050] Example 1

[0051] This embodiment adopts figure 1 The reaction system shown includes a first hydroprocessing reactor 1, a second hydroprocessing reactor 2, a third hydroprocessing reactor 3, a hydroprocessing reactor 5, and a hydroprocessing reactor 6. , Hydrotreating reactor 7. The reaction feed main pipeline L1 is respectively connected to the inlets of the first hydroprocessing reactor 1, the second hydroprocessing reactor 2, and the third hydroprocessing reactor 3 through three inlet pipelines, each The inlet pipelines are all provided with inlet valve bodies, that is, the reaction feed main pipeline L1 passes through the valve body 21, the valve body 22, and the valve body 23 respectively to the first hydroprocessing reactor 1, the second hydroprocessing reactor 2. The inlet of the third hydrogenation pretreatment reactor 3 is connected; the reaction discharge main pipeline L2 is connected to the first hydrogenation pretreatment reactor 1, the second hydrogenation p...

Example Embodiment

[0075] Example 2

[0076] This example is basically the same as Example 1, but the difference is that the raw material is residual oil B. The specific raw material properties are shown in Table 1. The reaction temperature and switching time of the hydrogenation pre-reactor are shown in Tables 4 and 5. The residual oil is formed by hydrogenation. Oil properties are shown in Table 6.

[0077] Table 4 The reaction conditions of the hydrogenation pretreatment reaction zone in Example 2

[0078]

[0079] Table 5: Switching time of the hydrogenation pretreatment reactor in Example 2

[0080] Switch for the first time Second switch Third switch The fourth switch Switching time, h650094001190013750

Example Embodiment

[0081] Example 3

[0082] This example uses the reaction system, reaction raw materials and reactor rotation method of Example 1. The differences are: the first hydroprocessing reactor 1, the second hydroprocessing reactor 2, the third hydroprocessing The ratio of the demetalization agent to the protective agent in the reactor 3 is 1:1, and each rotation remains unchanged, and the switching time of the hydropretreatment reactor is shown in Table 6.

[0083] In Example 3, due to the deactivation of the hydroprocessing catalyst and the pressure drop of the reactor in the main reaction zone reached the design value, the operation was forced to stop. The operation period is shown in Table 7.

[0084] Table 6: Switching time of the hydrogenation pretreatment reactor in Example 3

[0085] Switch for the first time Second switch Third switch The fourth switch Switching time, h50007300900010500

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Abstract

The invention discloses an alternated fixed-bed residual oil hydrotreatment method and system. According to the method, a first hydropretreating reactor and a second hydropretreating reactor are in series connection to be served as online hydropretreating reactors, the first hydropretreating reactor is switched over and serves as a non-online hydropretreating reactor when pressure drop in the first hydropretreating reactor rises to a pressure drop design upper limit or the activity of a catalyst is lower than a required value, and then, switchover is carried out according to a sequence that the second hydropretreating reactor and a third hydropretreating reactor are connected in parallel, the third hydropretreating reactor and the first hydropretreating reactor are connected in parallel, and the first hydropretreating reactor and the second hydropretreating reactor are connected in series, so that the condition that two hydropretreating reactors are online simultaneously is achieved, and an uninterrupted hydropretreating reaction can be achieved. According to the method, the utilization efficiency of a main catalyst and the stability of device operation can be improved, and the operating time of a hydrotreating reactor is greatly prolonged.

Description

technical field [0001] The present invention relates to a fixed bed residual oil hydrogenation treatment method and system, in particular to a fixed bed residual oil hydrogenation treatment method and system which can be rotated. Background technique [0002] As crude oil becomes heavier and worse, more and more heavy oil and residual oil need to be processed. The main purpose of the residue oil hydrotreating process is to greatly reduce the content of impurities such as sulfur, nitrogen, and metals in the residue oil raw material through hydrogenation treatment, and to convert non-ideal components such as polycyclic aromatics, colloids, and asphaltenes through hydrogenation. Increase the hydrogen-to-carbon ratio, reduce the residual carbon content, and significantly improve the cracking performance. [0003] Fixed bed residual oil hydrogenation technology is a deep processing technology for heavy oil. Under the condition of high temperature and high pressure hydrogenation,...

Claims

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Application Information

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IPC IPC(8): C10G65/02
CPCC10G65/02
Inventor 翁延博耿新国刘铁斌李洪广
Owner CHINA PETROLEUM & CHEM CORP
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