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A hydrocracking method for producing chemical raw materials

A technology for hydrocracking and chemical raw materials, which is applied in hydrotreating process, petroleum industry, processing hydrocarbon oil, etc., can solve the problem that the yield of heavy naphtha is not enough to meet the product demand, and the yield of light naphtha or light hydrocarbon is high. , increasing the complexity of the device, etc., to achieve the effects of excellent tail oil quality, small device investment and increased yield

Active Publication Date: 2021-12-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] (1) The yield of heavy naphtha under the one-pass process is not enough to meet the product demand of the enterprise;
[0016] (2) After ensuring that the yield of heavy naphtha meets the requirements of the enterprise, the yield of light naphtha or light hydrocarbons is relatively high;
[0018] (4) Circulating diesel oil or middle distillate oil to the second cracking reactor is equivalent to adding a section of hydrocracking unit, requiring additional reactors and circulating hydrogen systems, increasing the complexity of the device and increasing the investment

Method used

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  • A hydrocracking method for producing chemical raw materials
  • A hydrocracking method for producing chemical raw materials
  • A hydrocracking method for producing chemical raw materials

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specific Embodiment approach

[0059] The following combination figure 1 A preferred embodiment of the hydrocracking method for producing chemical raw materials of the present invention is provided, the method comprising:

[0060] Put the hydrocracking raw material 1 and hydrogen into the hydrocracking reaction zone 2 for hydrocracking pretreatment, and then enter the hydrocracking reaction zone 3 for hydrocracking reaction after the hydrocracking pretreatment to obtain the hydrocracking effluent Then, the hydrocracking effluent is introduced into the separation and fractionation unit 4 for fractionation, so as to obtain a light naphtha fraction 5, a heavy naphtha fraction 6, a diesel fraction 7 and a tail oil fraction 8; wherein, the added The hydrocracking feedstock 1 contains a VGO fraction and a DAO fraction, and the DAO fraction accounts for 10-30% by weight of the total amount of the hydrocracking feedstock 1, and the partial pressure of hydrogen in the hydrocracking reaction zone 3 is 20-80% of the ...

Embodiment 1

[0073] Hydrogenation pretreatment catalyst RN-410 and hydrocracking catalyst RHC-210 are used, and hydrogenation pretreatment catalyst RN-410 is filled in the hydrogenation pretreatment reaction zone, and hydrocracking catalyst RHC-210 is filled in the hydrocracking reaction zone , with raw material 1 in table 1 as feed, in the production scheme of embodiment 1 (using figure 1 Shown technological process carries out) obtain light naphtha fraction, heavy naphtha fraction, diesel oil fraction and tail oil fraction under.

[0074] Process conditions, product distribution, and key product properties are listed in Tables 2 and 3.

[0075] As shown in Table 2 and Table 3, under the condition of medium pressure of hydrocracking hydrogen partial pressure of 11MPa and hydrocracking reaction temperature of 375°C, after raw material 1 undergoes cracking reaction by the method in Example 1, naphtha + The total yield of tail oil reaches 70.2%, the selectivity of naphtha is 50.1%, the sele...

Embodiment 2

[0086] Hydrogenation pretreatment catalyst RN-410 and hydrocracking catalyst RHC-210 are used, and hydrogenation pretreatment catalyst RN-410 is filled in the hydrogenation pretreatment reaction zone, and hydrocracking catalyst RHC-210 is filled in the hydrocracking reaction zone , with raw material 1 in table 1 as feed, in the production scheme of embodiment 2 (using figure 1 Shown technological process carries out) obtain light naphtha fraction, heavy naphtha fraction, diesel oil fraction and tail oil fraction under.

[0087] Process conditions, product distribution, and key product properties are listed in Tables 2 and 3.

[0088] As shown in Table 2 and Table 3, under the conditions of hydrocracking hydrogen partial pressure of 8 MPa and hydrocracking reaction temperature of 373°C, raw material 1 undergoes cracking reaction by the method in Example 2, naphtha + tail oil The total yield reaches 72.0%, the selectivity of naphtha is 52.9%, the selectivity of heavy naphtha fr...

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Abstract

The invention relates to the field of hydrocracking, and discloses a hydrocracking method for producing chemical raw materials. The method includes: sequentially introducing the hydrocracking raw materials into a hydrocracking reaction zone and a hydrocracking reaction zone to carry out hydrogenation reaction , to obtain a hydrocracking effluent; then the hydrocracking effluent is subjected to fractional distillation; wherein, the hydrocracking raw material contains a VGO fraction and a DAO fraction, and the DAO fraction accounts for the total amount of the hydrocracking raw material 10-30% by weight, and the hydrogen partial pressure in the hydrocracking reaction zone is 20-80% of the hydrogen partial pressure in the hydrogenation pretreatment reaction zone. By adopting the method provided by the invention, the heavy naphtha yield of the hydrocracking unit can be greatly increased, and at the same time, high-quality DCC feed can also be produced.

Description

technical field [0001] The invention relates to the field of hydrocracking, in particular to a hydrocracking method for producing chemical raw materials. Background technique [0002] The world's demand for propylene is expected to continue to grow in the next 20 years, mainly driven by the market's demand for products such as polypropylene, acrylonitrile and phenolic resin; China's propylene demand growth exceeds the world average. Propylene is an important petrochemical raw material next to ethylene. Now about 70% of the world's propylene is produced by steam cracking with light hydrocarbons as raw materials, and the traditional steam cracking route to olefins is affected by the high cost in the context of globalization. Therefore, the development of methods for producing light olefins from heavy raw materials through catalytic cracking and catalytic cracking is a reasonable technical path to solve the shortage of chemical raw materials. [0003] The deep catalytic crack...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/02
CPCC10G67/02
Inventor 赵阳赵广乐毛以朝龙湘云
Owner CHINA PETROLEUM & CHEM CORP
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