Method for hydro-dearomatization in catalytic cracking of diesel

A technology for catalytic cracking diesel oil and hydrodearomatization, which is applied in the application field of diesel hydrodearomatization catalyst in catalytic cracking diesel hydrodearomatization, can solve the problem of high initial boiling point of diesel raw materials, and achieves enhanced macromolecular conversion ability , the effect of increasing acid strength and high intragranular diffusion rate

Inactive Publication Date: 2012-07-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN1407066A discloses a method for hydrogenation and upgrading of catalytic cracking diesel oil. The method uses a hydrogenation catalyst containing molecular sieves to carry out dearomatization, desulfurization and improvement of sixteen alkane number, but the initial boiling point of the diesel feedstock involved in this method is relatively high

Method used

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  • Method for hydro-dearomatization in catalytic cracking of diesel

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Embodiment 1

[0027] Get 100 grams of NaY molecular sieves (the degree of crystallinity is 97%, SiO 2 / Al 2 o 3 The molar ratio is 5.6, Lanzhou Petrochemical Company Catalyst Factory), SiO 2 / Al 2 o 3 molar ratio of 5.6, added to 70g NH 4 In the 1000ml aqueous solution of Cl, exchange at 80°C for 1 hour. During this process, the pH value is controlled to 3.4. After the exchange, filter and wash with water, and then in a 100% water vapor atmosphere, at a temperature of 600°C, the water vapor pressure is 0.3MPa. Next, treat for 2 hours; then carry out the second exchange and the second hydrothermal treatment according to the same conditions, and finally obtain the SiO of the modified Y molecular sieve 2 / Al 2 o 3 The molar ratio is 15, the relative crystallinity is 92%, the average grain size is 280nm, and the specific surface area is 904m 2 / g.

Embodiment 2

[0029] Get 100 grams of Na-Beta molecular sieves (the degree of crystallinity is 96%, SiO 2 / Al 2 o 3 The molar ratio is 22, Nankai University Catalyst Factory), joins to contain 65g NH 4 In 1000ml aqueous solution of Cl, exchange at 80°C for 1 hour, filter and wash after exchange, then hydrothermally treat at 610°C and 100% steam for 2 hours, and then treat with 3mol / L HCl solution at 80°C for 2 hours, The relative crystallinity of the finally obtained modified Beta molecular sieve is 86%, SiO 2 / Al 2 o 3 The molar ratio is 65, the average grain size is 90nm, and the specific surface area is 765m 2 / g.

Embodiment 3

[0031] Get modified Y molecular sieve 25.5g in embodiment 1, and 82.9g alumina (for example, the pseudo-boehmite produced by SASOL company, wherein the gibbsite content is 70wt%), 27.2g amorphous silicon aluminum, 4.7g scallop powder, after mixing, add dropwise a mixed solution of 6.5g concentrated nitric acid (96wt%), 4.3g citric acid and 108g water, extrude into a clover shape of 1.3mm, dry at 110°C, and roast in an air atmosphere at 500°C 4 hours. Then immerse with a solution of 33g of nickel nitrate and 50g of ammonium metatungstate dissolved in 50ml of water for 4 hours, dry at 110°C, and roast at 480°C for 4 hours in an air atmosphere to obtain catalyst A. According to specific requirements, it can be crushed or cut into the required particle size or length, and hydrogenation reaction can be carried out after vulcanization.

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Abstract

The invention relates to a method for hydro-dearomatization in catalytic cracking of diesel. According to the invention, Ni and W are adopted as hydrogenation active metal components of a catalyst and modified Y molecular sieve, modified Beta molecular sieve, amorphous silica-alumina and alumina are adopted as carriers of the catalyst, wherein the average crystal size of the modified Y molecular sieve is 100-400nm, the mole ratio of SiO2/Al2O3 is 5-40:1; the relative crystallinity is greater than 90% and the specific surface area is 700-1000m<2>/g; the average crystal size of the modified Beta molecular sieve is 50-200nm, the mole ratio of SiO2/Al2O3 is 50-200:1; the relative crystallinity is greater than 85% and the specific surface area is 700-900m<2>/g. When the method is adopted to process inferior diesel fraction, the desulfurization rate and the denitrification rate are up to more than 97.5%, the dearomatization rate is up to more than 55% and the diesel fraction yield is up to more than 98wt%.

Description

technical field [0001] The invention relates to a method for catalytically cracking diesel oil hydrodearomatization, and relates to the application of a diesel hydrodearomatization catalyst containing molecular sieves in catalytic cracking diesel oil hydrodearomatization. Background technique [0002] my country's heavy oil processing technology is mainly based on fluid catalytic cracking, and the processing capacity of catalytic cracking accounts for more than 30% of the secondary processing capacity, resulting in more than 30% of the finished diesel fuel from catalytic cracking. Moreover, the catalytic cracking unit is a device that mainly produces gasoline, and the ratio of diesel to gasoline cannot be increased, so it is difficult to meet the large demand for diesel in my country's market. FCC diesel contains more heteroatom compounds, olefins and aromatics, and its stability is poor, especially the cetane number is very low. With the increase of slagging in heavy oil c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/54B01J29/80
Inventor 王甫村张志华申宝剑田然郭巧霞孙发民王亮戴宝琴秦丽红吕倩朱金玲王东青张伟李海岩马守涛郭淑芝佟雪芳申波俊韩耀辉
Owner PETROCHINA CO LTD
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