A method for producing aromatics and light oil by catalytic conversion of straight-run diesel oil

A straight-run diesel and catalytic conversion technology, applied in chemical instruments and methods, catalyst activation/preparation, molecular sieve catalysts, etc., can solve the problem of low yield of aromatics and light oil, restrictions on high-value utilization of diesel, and reduction of refining and chemical enterprises Diesel-to-gasoline ratio and other issues, to achieve the effect of increasing the conversion rate of aromatic hydrocarbons, improving the conversion rate of diesel macromolecules, and improving the conversion rate of diesel oil

Active Publication Date: 2022-03-29
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 producing aromatics and light oil by catalytic conversion of straight-run diesel oil. The method comprises the following steps: 1) performing pretreatment on straight-run diesel oil to remove basic nitrogen compounds to obtain straight-run diesel oil removed from basic nitrogen compounds; 2) adding transition metal ions to the straight-run diesel oil removed from basic nitrogen compounds The modified nanometer ZSM‑5 molecular sieve catalyst is used as a reaction catalyst to carry out a catalytic conversion reaction to obtain the aromatic hydrocarbons and light oil. In the present invention, the straight-run diesel oil from which basic nitrogen compounds have been removed is used as the reaction raw material, and the modified nanometer ZSM-5 molecular sieve is used as the catalyst to carry out the catalytic conversion reaction, the catalyst has high reactivity, the reaction is more sufficient, the conversion rate of diesel oil macromolecules is improved, and the target product of aromatic hydrocarbons is obtained. The yield is increased, the formation of dry gas by-products is suppressed, and the coking speed of the catalyst is slowed down to prolong the single-pass cycle.

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 Patents(China)
IPC IPC(8): C10G57/00B01J29/40B01J29/48B01J29/46B01J35/10B01J37/30B01J37/02
CPCC10G57/00B01J29/405B01J29/48B01J29/46B01J35/1019B01J35/1061B01J37/30B01J37/0201B01J2229/186C10G2300/1055C10G2300/1059C10G2300/703C10G2400/30C10G2400/02C10G2400/04C10G2400/20
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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