Hydrocracking process for maximally producing middle distillate

A middle distillate and hydrocracking technology, applied in hydrotreating process, hydrocarbon oil cracking, petroleum industry and other directions, can solve problems such as reducing catalyst utilization efficiency, and achieve the effect of reducing aromatic hydrocarbon content, simple process and improving utilization rate

Inactive Publication Date: 2004-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because β zeolite and Y zeolite have their own suitable reaction species, for example, Y zeolite has a strong ring-opening ability for aromatic hydrocarbons, and β zeolite has a strong selective cracking function for aromatic hydrocarbon side chain breaking, chain hydrocarbon isomerization and long carbon chain hydrocarbons. However,

Method used

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Examples

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Embodiment

[0021] This process plan deals with a heavy vacuum gas oil VGO, the main properties of this petroleum hydrocarbon material are: specific gravity 0.9021cm 3 / g, distillation range 380°C-550°C, carbon residue 0.20wt%, sulfur 1.6wt%, nitrogen 1800μg / g.

[0022] This scheme has two reactors, including hydrofining reactor R1 and hydrocracking reactor R2. If the two reactors are used in series and share a set of circulating hydrogen system, a series of full cycle process flow is adopted. Hydrofining reactor R1 is loaded with 3996 heavy oil hydrofining catalyst produced by Fushun Petrochemical Company Catalyst Factory. The operating conditions of hydrofining are: pressure 15MPa, average bed temperature 375°C, volumetric space velocity of feed liquid 0.8hr -1 , The volume ratio of hydrogen to oil is 800. The nitrogen content of refined oil is generally 3-8 μg / g.

[0023]Composition and properties of the first hydrocracking catalyst containing zeolite beta: A1, A2, A3.

[0024] A1:...

example 1～4

[0037] Examples 1-4: The operating conditions of this technological scheme: the reaction pressure is 15MPa, the hydrogen-oil ratio is 1200, and the full cycle operation mode of >370°C is adopted. The single-pass conversion rate of <350°C fraction is controlled to be about 70wt%. Mid-oil selectivity is calculated as middle distillate (jet fuel and / or diesel fraction) yield divided by converted liquids yield (100 minus tails).

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Abstract

A hydrocracking process for increasing the output of intermediate fractional oil to maximum features that the hydrorefined heavy petroleum hydrocarbon is contacted first with the beta-zeolite hydrocracking catalyst for cracking the most of raw material and then with the Y-zeolite hydrocracking catalyst for cracking the rest of raw material. Its advantages are high selectivity and low content of olefin in intermediate fractional oil.

Description

technical field [0001] The invention relates to a one-stage serial hydrocracking process, especially a one-stage serial process for producing middle distillates in a large amount. Background technique [0002] The hydrocracking process is an important processing method for lightening heavy raw materials, especially the main method for obtaining clean jet fuel and diesel from inferior raw materials. The development of hydrocracking catalysts has gone through the process from amorphous hydrocracking catalysts to zeolite hydrocracking catalysts. [0003] The zeolites commonly used in hydrocracking catalysts are mainly Y-type zeolites. The Y zeolite hydrocracking catalyst has good ring-opening activity, and is especially suitable for treating heavy raw materials with high aromatic hydrocarbons, and the obtained products are of high quality. However, at a certain activity level of Y zeolite-type hydrocracking catalysts, there is a limit to the improvement of medium oil selectiv...

Claims

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Application Information

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IPC IPC(8): C10G47/02C10G65/12
Inventor 陈松谷明镝关明华王继峰
Owner CHINA PETROLEUM & CHEM CORP
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