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Method for prolonging quality stability of hydrocracking product

A technology for hydrocracking and product quality, which is applied in hydroprocessing process, petroleum industry, and hydrocarbon oil treatment. It can solve the problems of exceeding the standard and high bromine index of heavy naphtha, so as to prolong the operation cycle, reduce acidity and hydrogenation Performance, retardation of coking tendency and effect on deactivation rate

Active Publication Date: 2019-05-21
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the problems in the prior art that the olefins that commonly exist in the late stage of the hydrocracking reaction process using post-treatment catalysts exceed the standard, that is, the bromine index of heavy naphtha is too high, the mercaptans are too high, and the sulfur of aviation fuel products exceeds the standard. The use of grading and temperature control provide a method to improve the quality stability of hydrocracking products

Method used

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  • Method for prolonging quality stability of hydrocracking product
  • Method for prolonging quality stability of hydrocracking product
  • Method for prolonging quality stability of hydrocracking product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] use figure 1 In the process flow shown, A and B are used for the treatment catalyst, C1 is used for the cracking catalyst, the conversion rate of the reaction mass is controlled to 95%, the operation time is 14 months, and the bromine index of heavy naphtha is sampled and analyzed.

Embodiment 2

[0042] use figure 1 In the process flow shown, A and B are used for the treatment catalyst, C2 is used for the cracking catalyst, the conversion rate of the reaction mass is controlled to 94%, the operation time is 16 months, and the bromine index of heavy naphtha is sampled and analyzed.

Embodiment 3

[0046] use figure 1 In the process flow shown, A and B are used for the treatment catalyst, C3 is used for the cracking catalyst, the reaction mass conversion rate is controlled to 95%, the operation time is 18 months, and the bromine index of heavy naphtha is sampled and analyzed.

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Abstract

The invention discloses a method for prolonging the quality stability of a hydrocracking product. The method comprises the following steps that hydrocracking raw materials and hydrogen gas are mixed to enter a hydrocracking pretreatment reactor for refining reaction; reaction effluents enter a hydrocracking reactor for hydrocracking reaction; four hydrocracking catalyst bed layers are arranged inthe hydrocracking reactor; when the conversion rate of fractions higher than 350 DEG C in hydrocracking raw materials is 90 to 99 percent, a hydrogenation posttreatment catalyst bed layer is arrangedat each of the top and the bottom of any one hydrocracking catalyst bed layer; the volume ratio of posttreatment catalysts filled along the material flow direction is (3 to 7):(5 to 15):(5 to 25):(20to 40):(30 to 50); the volume ratio of the hydrogenation posttreatment catalysts in the hydrocracking reactor to hydrocracking catalysts filled in the hydrocracking reactor is 1:(6 to 8); after hydrocracking products are separated, various products are obtained. By the method, the stability of the hydrocracking products can be obviously improved.

Description

technical field [0001] The invention relates to a method for prolonging the quality stability of hydrocracking products, in particular to a method for prolonging the quality stability of heavy naphtha products in late hydrocracking products during long-term operation. Background technique [0002] The hydrocracking process is under the action of hydrogen, high temperature, high pressure and catalysts to hydrodesulfurize, hydrodenitrogenate, polycyclic aromatic hydrocarbons, hydrosaturation and ring-opening cracking of heavy distillate oils (VGO, CGO, DAO). The process of converting into light oil and middle distillate oil has the characteristics of flexible operation, good product quality and environmental friendliness. As one of the main processes for the deep processing of heavy distillate oil, it is not only the production of light oil products in the refining industry It has become an important means of petrochemical enterprises, and has become the key technology of petr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/12
Inventor 王仲义崔哲彭冲孙士可吴子明曹正凯
Owner CHINA PETROLEUM & CHEM CORP
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