Method for reducing polycyclic aromatic hydrocarbon in diesel oil

A technology for polycyclic aromatic hydrocarbons and diesel oil, which is applied in the treatment of hydrocarbon oil, petroleum industry, hydrocarbon oil treatment products, etc., and can solve the problems of increasing energy consumption and operating costs of the device

Active Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the method of the invention, most of the sulfur-containing compounds in the raw oil are removed in the gas-phase circulating hydrogenation reactor, and the macromolecular sulfur-containing compounds and polycyclic aromatic hydrocarbons that are difficult to remove are in the liquid-phase circulating hydrogenation reactor. For removal, the invention uses a conventional hydrogenation catalyst. To remove these difficult-to-remove macromolecular sulfur-containing compounds and polycyclic aromatic hydrocarbons, it is necessary to increase the reaction temperature and increase the hydrogen partial pressure, and the hydrogen sulfide produced by the reaction It will also inhibit the hydrogenation removal of macromolecular sulfides and polycyclic aromatic hydrocarbons. In order to achieve qualified diesel products, multiple liquid phase cycles are required, which will increase the energy consumption and operating costs of the device.

Method used

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  • Method for reducing polycyclic aromatic hydrocarbon in diesel oil

Examples

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preparation example Construction

[0030] The preparation method of noble metal hydrogenation catalyst of the present invention comprises the following contents:

[0031] (1) Impregnate a solution containing a palladium compound and / or a platinum compound into an alumina carrier, dry and calcinate to obtain a catalyst precursor.

[0032] (2) Immerse the solution containing the auxiliary agent into the catalyst precursor prepared in step (1), and obtain the catalyst through drying, roasting and reduction treatment.

[0033] In the preparation method of the noble metal hydrogenation catalyst of the present invention, the palladium-containing compound in step (1) is selected from palladium chloride, palladium nitrate, palladium acetate, sodium tetrachloropalladate, dichlorotetraammine palladium, palladium trifluoroacetate, di Palladium acetylacetonate or palladium hexafluoroacetylacetonate, the solution concentration is 0.001-0.5g / mL calculated as palladium element.

[0034] In the preparation method of the noble...

Embodiment 1

[0038] Prepared noble metal catalyst in embodiment 1:

[0039] Example 1

[0040] Dissolve chloroplatinic acid in deionized water, in which the concentration of platinum is 0.002g / mL, impregnate an equal volume of the chloroplatinic acid solution into an alumina carrier, dry at 120°C for 6h, and then bake at 450°C for 5h.

[0041] Dissolve nickel nitrate in deionized water, in which the concentration of nickel oxide is 0.02g / mL, impregnate the nickel nitrate solution into the catalyst precursor in equal volume, then dry at 90°C for 5h, calcinate at 250°C for 3h, and then in a hydrogen atmosphere , and reduced at 400°C and 3.0 MPa for 6 hours to obtain a noble metal catalyst C3-1, in which the metal platinum content is 0.25%, and the nickel content is 3.5%.

Embodiment 2

[0044] Dissolve ammonium metatungstate and aluminum chloride in deionized water to prepare mixed solution A, and WO in mixed solution A 3 The weight concentration is 80g / L, Al 2 o 3 The weight concentration is 50g / L. Slowly add sodium hydroxide with a concentration of 1.0mol / L into 1L of solution A under stirring, keep the gelling temperature at 75°C, control the pH value at 7~8 at the end, control the gelling time at 60 minutes, and form Slurry I containing tungsten and aluminum precipitates.

[0045] Mix 160 mL of 1.0 mol / L magnesium nitrate solution with slurry I evenly, then adjust the pH value to 7~8 with ammonia water, then wash with deionized water three times, filter and dry at 110°C for 5 hours to obtain a mixed powder. Then take 150g of mixed powder and mix them with 5g of nitric acid, 5g of starch and 60g of deionized water evenly, then knead and extrude into strips, dry at 100°C for 3h, and roast at 550°C for 3h, and then use 1.5%H 2 The hydrogen of S is vulcan...

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Abstract

The invention discloses a method for reducing polycyclic aromatic hydrocarbon in diesel oil. The method comprises the following steps: a gas-phase component obtained after flash evaporation of a diesel oil raw material enters a first hydrogenation reaction zone for a hydrogenation reaction; a liquid-phase component after flash evaporation enters a second hydrogenation reaction zone for hydrodesulfurization and denitrification reaction, an effluent of the second hydrogenation reaction zone downwards enters a third hydrogenation reaction zone for polycyclic aromatic hydrocarbon hydrogenation saturation reaction, and a product of the third hydrogenation reaction zone is discharged from the bottom of the reactor; the second hydrogenation reaction zone is filled with a semi-sulfurized bulk phase hydrogenation catalyst, and the catalyst comprises a VIB group metal sulfide, a VIII group metal oxide, Al2O3 and an auxiliary agent; based on the weight of the bulk-phase hydrofining catalyst, the content of the VIB-group metal sulfide is 40-70%, and the content of the VIII-group metal oxide is 3-25%. According to the method, the high-quality diesel blending component with ultralow sulfur and low polycyclic aromatic hydrocarbon content is produced by taking inferior diesel mixed oil as a raw material under the conditions of simple process, low energy consumption and low cost through the matching of the catalyst and the process flow.

Description

technical field [0001] The invention belongs to the field of clean oil refining, and in particular relates to a method for reducing polycyclic aromatic hydrocarbons in diesel oil. Background technique [0002] With the demand for diesel quality upgrades, my country's diesel has now completed the quality upgrade of the National VI standard, in which the sulfur content is not more than 10ppm, and the polycyclic aromatic hydrocarbon content is not more than 7%. According to foreign diesel quality standards, the content of polycyclic aromatic hydrocarbons in diesel oil in certain regions of the United States is even lower. It can be seen that further reducing the content of polycyclic aromatic hydrocarbons in diesel oil is an important development direction for diesel quality upgrading. [0003] CN 102465021B discloses a diesel combined hydrogenation process. The method is to first cut the diesel raw material into light and heavy components, the light components enter the liqui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02
CPCC10G67/02C10G2300/4006C10G2300/4012C10G2300/4018C10G2300/70C10G2400/04C10G2300/202
Inventor 刘丽代萌杨成敏段为宇郭蓉周勇李扬姚运海郑步梅孙进
Owner CHINA PETROLEUM & CHEM CORP
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