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Hydrocracking method for improving yield of heavy naphtha

A technology for hydrocracking and heavy naphtha, which is applied in the petroleum industry, hydrotreating process, processing hydrocarbon oil, etc., can solve the problem of not fully considering the enhanced conversion of hydrocarbons by partition and high yield, and reduce the cold hydrogen reserve. The effect of low energy consumption, low hydrogen consumption and load reduction

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

AI Technical Summary

Problems solved by technology

The second reaction zone of the present invention can fully convert the difficult-to-convert tail oil fractions into naphtha fractions under high space velocity and low severity conditions, but fails to fully consider the enhanced conversion of hydrocarbons, dry gas, liquefied gas, and pumice. The yield of products with low added value such as naphtha is still relatively high

Method used

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  • Hydrocracking method for improving yield of heavy naphtha
  • Hydrocracking method for improving yield of heavy naphtha
  • Hydrocracking method for improving yield of heavy naphtha

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0031] Using Iranian VGO as raw material oil, FF-46 hydrocracking pretreatment catalyst is selected to match the catalyst system of hydrocracking catalyst I / hydrocracking catalyst II / hydrocracking catalyst III / hydrocracking catalyst IV. The four hydrocracking catalysts are all supported by amorphous silica-alumina and modified Y molecular sieve. The volume ratio of hydrocracking catalyst I / hydrocracking catalyst II / hydrocracking catalyst III / hydrocracking catalyst IV in Examples 1-3 is 1:1:1:1.

[0032] At the total reaction pressure of 15.0MPa, the volume ratio of hydrogen to oil in the refining section and the cracking section is 900:1 and 1100:1 respectively, and the volume space velocity of the fresh material in the refining section and the cracking section is 1.1h -1 and 1.2h -1 , control the nitrogen content of refined oil to 5-8 ug.g -1 , a process test with a conversion rate of about 60wt% to 80wt% at >320°C was carried out, and the product quality of each fraction w...

Embodiment 4

[0036] Using Iranian VGO as raw material oil, the catalyst system of FF-46 hydrocracking pretreatment catalyst combined with hydrocracking catalyst I / hydrocracking catalyst II was selected. Both hydrocracking catalysts use amorphous silica-alumina and modified Y molecular sieve as carriers. The volume ratio of hydrocracking catalyst I / hydrocracking catalyst II in Example 4 is 1:1.

[0037] At the total reaction pressure of 15.0MPa, the volume ratio of hydrogen to oil in the refining section and the cracking section is 900:1 and 1100:1 respectively, and the volume space velocity of the fresh material in the refining section and the cracking section is 1.1h -1 and 1.2h -1 , control the nitrogen content of refined oil to 5-8 ug.g -1 , a process test with a conversion rate of about 70wt% at >320°C was carried out, and the product quality of each fraction was investigated.

[0038] See Table 1 for the specific properties of the feedstock oil, Table 2 for the basic properties of ...

Embodiment 5

[0041] Using Iranian VGO as raw material oil, FF-46 hydrocracking pretreatment catalyst is selected to match the catalyst system of hydrocracking catalyst I / hydrocracking catalyst II / hydrocracking catalyst III. The three hydrocracking catalysts are supported by amorphous silica-alumina and modified Y molecular sieve. In Example 5, the volume ratio of hydrocracking catalyst I / hydrocracking catalyst II / hydrocracking catalyst III is 1:1:1.

[0042] At the total reaction pressure of 15.0MPa, the volume ratio of hydrogen to oil in the refining section and the cracking section is 900:1 and 1100:1 respectively, and the volume space velocity of the fresh material in the refining section and the cracking section is 1.1h -1 and 1.2h -1 , control the nitrogen content of refined oil to 5-8 ug.g -1 , a process test with a conversion rate of about 70wt% at >320°C was carried out, and the product quality of each fraction was investigated.

[0043] See Table 1 for the specific properties o...

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Abstract

The invention discloses a hydrocracking method for improving the yield of heavy naphtha. The method comprises the following components: (1), raw oil and hydrogen are mixed and then enter a hydrorefining reactor, and are in contact with a hydrorefining catalyst, so that refining reaction, such as hydrodesulfurization, hydrodenitrogenation and aromatic saturation, occurs; (2), generated oil obtainedin the step (1) and hydrogenation tail oil are mixed and enter a hydrocracking reactor to be subjected to hydrocracking reaction, and are mixed with circulation oil among different beds to be reactedcontinuously; (3), generated oil obtained in the step (2) enters a separation system, obtained hydrogen is recycled, obtained generated distillate oil enters a fractionating system, so as to obtain gas, light naphtha, heavy naphtha, middle distillate and hydrogenation tail oil, the hydrogenation tail oil and the generated oil obtained in the step (1) are mixed and then circulated to the inlet ofthe hydrocracking reactor, and the middle distillate returns the positions among catalyst beds of the hydrocracking reactor. The method can produce more heavy naphtha and improve the product quality of the heavy naphtha.

Description

technical field [0001] The invention relates to a hydrocracking method for increasing the yield of heavy naphtha, in particular to a hydrocracking method for system optimization to produce high-quality heavy naphtha. Background technique [0002] As the market demand for middle distillates continues to decrease, refineries need to change their product structure and reduce the ratio of diesel to gasoline. The new fuel standard puts forward stricter requirements on the indicators of gasoline and diesel. Obviously, primary processing methods and FCC technology can no longer meet the market's requirements for clean fuels. The hydrocracking process is not only a secondary processing method to lighten heavy raw materials, but also an important means to obtain high-quality chemical raw materials such as naphtha from inferior raw materials. [0003] The one-time investment of the hydrocracking unit is relatively large, and the operating cost is also relatively high. Therefore, maj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02
Inventor 彭冲王仲义崔哲吴子明曹正凯孙士可
Owner CHINA PETROLEUM & CHEM CORP
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