Hydrocracking method for reforming material yield increase

A hydrocracking and hydrofining technology, which is applied in the fields of hydrotreating process, petroleum industry, hydrocarbon oil treatment, etc., can solve the problems of large equipment investment and achieve the effect of low cost

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention can obtain heavy naphtha by recycling middle distillate oil, but it adopts two-stage hydrocracking, and the equipment investment is relatively large, and the re-refining part is all middle distillate oil

Method used

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  • Hydrocracking method for reforming material yield increase
  • Hydrocracking method for reforming material yield increase
  • Hydrocracking method for reforming material yield increase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] When the reaction pressure is 13.0MPa, the reaction temperature of the hydrotreating reactor is 373°C, and the space velocity is 1.2h -1 , hydrocracking reactor reaction temperature 367 ℃, space velocity 2.0h -1 , under the reaction conditions that the volume ratio of hydrogen to oil is 1200. According to the method provided by the present invention, the experiment was carried out with raw material A, in which the 220-320°C light oil fraction accounting for 40% by mass of the total light oil oil was recycled to the inlet of the hydrocracking reactor. The test results are shown in Table 2.

[0037] As can be seen from Table 2, under the condition of> 350 ℃ of conversion rate 61%, the yield of heavy naphtha cut is 31.77% (to fresh raw material), and the yield of kerosene cut is 12.59%; In addition, heavy naphtha The selectivity was 86%.

Embodiment 2

[0042] Adopt the method provided by the present invention, control > 350 ℃ conversion rate is 65%, at reaction pressure 13.0MPa, hydrotreating reactor reaction temperature 375 ℃, space velocity 1.2h -1 , hydrocracking reactor reaction temperature 373 ℃, space velocity 2.0h -1 , under the reaction conditions that the volume ratio of hydrogen to oil is 1200. With the method provided by the present invention, the experiment is carried out with raw material A, wherein the 220-320°C light diesel oil fraction accounting for 10% of the mass fraction of fresh raw material A is recycled to the inlet of the hydrocracking reactor, and the fractions of heavy naphtha, aviation kerosene and diesel oil are Product quality data are listed in Table 4. It can be seen from Table 4 that the aromatic potential of the heavy naphtha obtained from back refining is 59.2, the smoke point of aviation kerosene is 27.3 mm, and the cetane number of light diesel oil is 62.4.

Embodiment 3

[0046] Both improving the conversion rate and refining light diesel oil can increase the yield of heavy naphtha; in order to further understand the difference between the two schemes, at first the yield of heavy naphtha reaches 34% as the target, and the method provided by the invention is used to carry out refining Hydrocracking test of 60% of the total light oil fraction by weight, the reaction pressure is 10.5MPa, the reaction temperature of the hydrotreating reactor is 373°C, and the space velocity is 1.2h -1 , hydrocracking reactor space velocity 2.0h -1 , under the reaction conditions that the volume ratio of hydrogen to oil is 1200. With the method provided by the present invention, the experiment was carried out using raw material A, and the product distribution and hydrogen consumption results are listed in Table 6.

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Abstract

The invention relates to a hydrocracking method for reforming material yield increase. Raw oil and hydrogen gas are mixed and then the mixture is sequentially subjected to hydrorefining reaction and hydrocracking reaction, reaction effluent is cooled and separated, and then, the obtained light diesel fractions with the volume percentage being 10 to 100 percent and the distillation range being 220 to 320 DEG C return to a hydrocracking reaction vessel for continuous reaction. Because the arene content and cyclane content of the part of fractions are high, the fractions are proper fractions for high-quality heavy naphtha yield increase, and the yield of aviation fuel and the cetane number of the diesel fractions can also be improved through recycling the fractions. When the method provided by the invention is adopted, the recycled light diesel fractions enter the hydrocracking reaction vessel instead of a raw material tank and do not pass through a hydrorefining reaction vessel, so few arene and cyclane parts take hydrosaturation reaction, the potential arene of the heavy naphtha is favorably improved, and the hydrogen consumption is favorably reduced.

Description

technical field [0001] The invention belongs to a method for cracking and cracking hydrocarbon oil in order to obtain low-boiling point distillation in the presence of hydrogen, more specifically, it is a low-cost hydrocracking method for increasing production of reforming raw materials. Background technique [0002] The reforming unit is an important secondary processing unit in a refinery, used to produce high-octane gasoline blending components or to produce aromatic hydrocarbon base materials. Reformed gasoline has the characteristics of high octane number, no olefins, no sulfur and nitrogen impurities, and is a high-quality gasoline blending component. Compared with European and American countries, reformed gasoline components in the current domestic gasoline composition are relatively small, while catalytic cracking gasoline components account for a relatively high proportion, resulting in high sulfur and olefin content in domestic commodity gasoline and relatively low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/00
Inventor 赵阳董建伟胡志海王子文毛以朝龙湘云聂红
Owner CHINA PETROLEUM & CHEM CORP
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