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Hydrocracking method of inferior diesel oil raw material

A technology for hydrocracking and low-quality diesel oil, which is applied in the fields of hydrotreating process, petroleum industry, and hydrocarbon oil treatment, etc. It can solve the problems of high hydrogen consumption, low product selectivity, easy poisoning and deactivation of hydrocracking catalysts, etc., and achieves The effect of less non-framework aluminum, increased aromatics content, and abundant secondary pores

Active Publication Date: 2021-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for hydrocracking of inferior diesel oil to solve the problem of hig

Method used

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  • Hydrocracking method of inferior diesel oil raw material
  • Hydrocracking method of inferior diesel oil raw material
  • Hydrocracking method of inferior diesel oil raw material

Examples

Experimental program
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Effect test

preparation example Construction

[0048] The preparation process of hydrocracking catalyst B is as follows:

[0049] First, the Y molecular sieve in the hydrocracking catalyst B is prepared by multiple dealumination and three times of water roasting:

[0050] (1) Use NaY zeolite as raw material to exchange with ammonium chloride solution. The treatment conditions are: according to the ratio of NaY molecular sieve (dry basis): ammonium chloride: water = 1:0.7:10, exchange at 85°C for 1h, filter Afterwards, it was washed with deionized water and dried at 120°C for 4 hours.

[0051] (2) The molecular sieve obtained in the step (1) is subjected to the first hydrothermal calcination treatment, the calcination temperature is 600° C., and the calcination is carried out under 100% water vapor atmosphere for 2 hours.

[0052] (3) The molecular sieve obtained in step (2) is according to the ratio of molecular sieve (dry basis): citric acid: sulfuric acid: water = 1: 0.15: 0.05: 8, first add water to the molecular sieve...

Embodiment 1

[0072] Diesel feed oil C is cut into light diesel oil fraction C1 (235°C) at a cut point of 235°C. The heavy diesel oil fraction C2 is mixed with hydrogen and enters the hydrofinishing reactor, where it contacts with the hydrofinishing catalyst RN-411, and undergoes hydrodesulfurization, denitrogenation and selective hydrogenation saturation reactions under hydrofinishing reaction conditions; light diesel oil fraction After C1 is mixed with the hydrofining reaction effluent, it enters the hydrocracking reactor and reacts with the hydrocracking catalyst RHC-100. The hydrocracking reaction effluent is separated and fractionated to obtain BTX-rich fractions and hydrogenated diesel fractions. The reaction conditions are shown in Table 3, and the product yields and properties are shown in Table 4.

[0073] It can be seen from Table 4 that the saturation rate of polycyclic aromatic hydrocarbons in the hydrofinishing process is 80.8%, and the selectivity of single-ring aromatic hydro...

Embodiment 2

[0075] Diesel feed oil C is cut into light diesel oil fraction C1 (235°C) at a cut point of 235°C. The heavy diesel oil fraction C2 is mixed with hydrogen and enters the hydrofinishing reactor, where it contacts with the hydrofinishing catalyst RN-411, and undergoes hydrodesulfurization, denitrogenation and selective hydrogenation saturation reactions under hydrofinishing reaction conditions; light diesel oil fraction After C1 is mixed with the hydrofining reaction effluent, it enters the hydrocracking reactor and reacts with the hydrocracking catalyst RHC-100. The hydrocracking reaction effluent is separated and fractionated to obtain BTX-rich fractions and hydrogenated diesel fractions. Wherein 50% by mass of the hydrogenated diesel fraction is returned to the inlet of the hydrocracking reaction zone for further conversion. The reaction conditions are shown in Table 3, and the product yields and properties are shown in Table 4.

[0076] It can be seen from Table 4 that the ...

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Abstract

The invention relates to a hydrocracking method of an inferior diesel oil raw material, which comprises the following steps: cutting the inferior diesel oil raw material into a diesel oil light fraction and a diesel oil heavy fraction, and carrying out hydrodesulfurization, hydrodenitrogenation and selective hydrodearomatization reactions on the diesel oil heavy fraction in a hydrofining reaction zone; mixing the hydrofining reaction effluent and the diesel oil light fraction and then entering a hydrocracking reaction zone to be subjected to ring opening and side chain breaking reactions, and performing gas-liquid separation and liquid fractionation on the hydrocracking reaction effluent to obtain a BTX-rich fraction and a hydrogenated diesel oil fraction. The method provided by the invention is low in hydrogen consumption, high in product selectivity and high in economical efficiency.

Description

technical field [0001] The invention relates to a hydrocracking method for low-quality diesel raw material. Background technique [0002] With the increasingly poor quality of crude oil, the further upgrading of domestic diesel product quality and the continuous decline of the diesel-to-gasoline ratio, more and more diesel is in surplus, especially low-quality diesel. Requirements, and the aromatic hydrocarbons rich in low-quality diesel oil can not be effectively used, it is becoming more and more important to find a processing technology to process low-quality diesel oil. [0003] For low-quality FCC diesel, conventional processing methods include hydrofining and hydro-upgrading. Among them, NiMo, CoMo, and NiW catalysts are generally used for hydrofinishing, and the quality of FCC diesel products is improved through hydrogenation saturation, desulfurization, and denitrogenation of aromatics. Under conventional hydrofinishing conditions, the cetane number increase value i...

Claims

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Application Information

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IPC IPC(8): C10G67/00
CPCC10G67/00C10G2300/1037C10G2300/1055C10G2300/1059C10G2300/70C10G2400/04C10G2400/30C10G2300/202
Inventor 任亮严张艳刘建伟胡志海张毓莹许双辰杨平
Owner CHINA PETROLEUM & CHEM CORP
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