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
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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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