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Method for preparing aromatic hydrocarbons and light oil through catalytic conversion of straight-run diesel oil

A straight-run diesel, catalytic conversion technology, applied in chemical instruments and methods, catalyst activation/preparation, molecular sieve catalysts, etc. Value utilization and other issues, to achieve the effect of improving the conversion rate of aromatic hydrocarbons, the conversion rate of diesel oil, and the conversion rate of diesel macromolecules

Active Publication Date: 2020-09-29
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are generally one or more deficiencies in diesel catalytic conversion technology, such as low conversion rate of diesel oil, low yield of aromatics and light oil, and high reaction temperature, which seriously restricts the high-value utilization of diesel oil and is not conducive to refining and chemical enterprises. Reduce the diesel-gas ratio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] This embodiment provides a method for producing aromatics and light oil by catalytic conversion of straight-run diesel oil, which specifically includes the following steps:

[0067] A. In the straight-run diesel oil, add the solid powder of sodium dihydrogen phosphate whose mass is 1% of the mass of straight-run diesel oil into the straight-run diesel oil, shake for 4 hours to completely dissolve the solid powder of sodium dihydrogen phosphate, and let it stand for 48 hours to separate layers. The liquid is straight-run diesel oil from which basic nitrogen compounds have been removed;

[0068] B, to nanometer ZSM-5 molecular sieve shaping catalyst (by 80wt% ZSM-5 molecular sieve powder, 20wt% Al 2 o 3 Prepared by powder mixing, the nano ZSM-5 molecular sieve molding catalyst has a molar ratio of silicon to aluminum of 12.5 and a specific surface area of ​​345m 2 / g, the average particle diameter is 35nm) carry out transition metal ion Ga modification; Concrete process...

Embodiment 2

[0077] Repeat Example 1, the difference is: in step A, the acidic substance used for the pretreatment of removing basic nitrogen compounds is potassium dihydrogen phosphate.

[0078] The yield and effect of the catalytic conversion product of straight-run diesel oil in this embodiment are as follows: diesel oil conversion rate: 78.46%, dry gas yield: 18.27%, liquefied gas yield: 31.66%, gasoline yield: 28.33%, light diesel oil yield: 21.54% , the yield of low-carbon olefins is 31.55%, and the one-way cycle of the catalyst is 76 hours.

Embodiment 3

[0080] Repeat Example 1, wherein the difference is: in step A, the acidic substance used for the pretreatment of removing basic nitrogen compounds is a mixture of sodium dihydrogen phosphate and potassium dihydrogen phosphate (the mass ratio of the two is 1:1), The mass of acidic substance solid powder is 5% of the mass of straight-run diesel oil.

[0081] The yield and effect of the straight-run diesel catalytic conversion product in this embodiment are as follows: diesel oil conversion rate: 80.11%, dry gas yield: 18.65%, liquefied gas yield: 31.54%, gasoline yield: 28.5%, light oil yield: 19.89% , the yield of low-carbon olefins is 35.67%, and the one-way cycle of the catalyst is 79 hours.

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Abstract

The invention provides a method for preparing aromatic hydrocarbons and light oil through catalytic conversion of straight-run diesel oil. The method comprises the following steps: 1) carrying out analkaline nitride removal pretreatment on straight-run diesel oil to obtain straight-run diesel oil without alkaline nitride; and 2) performing a catalytic conversion reaction on the straight-run diesel oil without alkaline nitride by taking a transition metal ion modified nano ZSM-5 molecular sieve catalyst as a reaction catalyst to obtain aromatic hydrocarbons and light oil. Straight-run diesel oil without alkaline nitride is used as a reaction raw material, and a modified nano ZSM-5 molecular sieve is used as a catalyst to carry out a catalytic conversion reaction; the activity of the catalyst is high, the reactions are more efficient, the conversion rate of diesel macromolecules is increased, the yield of aromatic hydrocarbons is increased, the generation of dry gas (byproduct) is inhibited, the coking speed of the catalyst is slowed down, and the one-way period is prolonged.

Description

technical field [0001] The invention relates to the technical field of straight-run diesel catalytic conversion, in particular to a method for preparing aromatics and light oil by catalytic conversion of straight-run diesel. Background technique [0002] With the continuous transformation of my country's economic structure in recent years, the demand for diesel has gradually decreased after reaching its peak in 2015, while the demand for high-quality gasoline has continued to grow. The decline in the diesel-gasoline ratio has become an inevitable trend and will continue for a long time. It is expected that It will drop to around 1.3 by 2020 and around 1.1 by 2030. Therefore, optimizing the structure of refining and chemical products and reducing the diesel-to-gasoline ratio are not only important means for the refining and chemical industry to meet market demand, social demand, and improve quality and efficiency during the "13th Five-Year Plan" period, but also effective meas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G57/00B01J29/40B01J29/48B01J29/46B01J35/10B01J37/30B01J37/02
CPCC10G57/00B01J29/405B01J29/48B01J29/46B01J37/30B01J37/0201B01J2229/186C10G2300/1055C10G2300/1059C10G2300/703C10G2400/30C10G2400/02C10G2400/04C10G2400/20B01J35/615B01J35/647
Inventor 许江刘家旭田亮王小强程中克杨利斌常桂祖孟宏穆珍珍张志红
Owner PETROCHINA CO LTD
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