Hydrodewaxing method for diesel fraction

[0031] Example 1

[0032] Will be made of small pore alumina (specific surface 238m 2 ·G -1 , Pore volume 0.48mL·g -1 ) Is added to HZSM-5 molecular sieve (97wt% on dry basis, manufacturer: Tianjin Nankai University Catalyst Factory, SiO 2 /Al 2 O 3 In the molar ratio 38), the mixture is uniformly mixed, extruded into a shape, dried at 130°C for 4 hours, and calcined at 580°C for 4 hours to obtain a carrier.

[0033] The above-mentioned carrier is added to an aqueous solution of zinc nitrate with a weight content of zinc oxide of 6% and immersed in an equal volume for 5 hours. After filtration, the solid phase obtained is dried at 120° C. for 4 hours to obtain a zinc modified carrier.

[0034] Cyclohexane was added to dimethyl silicone oil to obtain a silicone oil organic mixture with a silica weight concentration of 15%, and then the zinc-modified carrier was added to the above-mentioned silicone oil organic mixture and immersed in an equal volume. The immersion time was 3 hours . After filtration, it was dried at 100°C for 4 hours and calcined at 580°C for 4 hours to obtain a zinc- and silicon-modified carrier S1, wherein the weight content of zinc oxide was 2.0% and the content of silicon oxide surface coating was 5.0% by weight.

[0035] The obtained carrier S1 is immersed in an aqueous solution containing nickel and tungsten, and then dried at 120°C for 5 hours, and calcined at 600°C for 3 hours to obtain a hydrogen-containing depressurizing catalyst N1.

[0036] Example 2

[0037] Will be made of small pore alumina (specific surface 238m 2 ·G -1 , Pore volume 0.48mL·g -1 The binder made of) was added to HZSM-5 molecular sieve (same as Example 1), mixed uniformly, extruded into a shape, dried at 130°C for 4 hours, and calcined at 580°C for 4 hours to obtain a carrier.

[0038] The above-mentioned carrier was immersed in an aqueous solution of copper oxide content of 3wt% copper nitrate and magnesium oxide content of 3wt% magnesium nitrate in a volume ratio of 1:1.5, and the immersion time was 4 hours. After filtration, the solid phase obtained was subjected to 120 After drying at ℃ for 5 hours, a copper and magnesium modified carrier was obtained.

[0039] Add solvent gasoline to ethyl silicone oil to obtain a silicone oil organic mixture with a silicon oxide weight concentration of 20%, and then add the copper and magnesium modified carrier to the aforementioned silicone oil organic mixture for immersion in a volume ratio of 1:1.5. The immersion time is 3 hours. After filtration, it was dried at 100°C for 6 hours and calcined at 550°C for 6 hours to obtain a carrier S2 modified with copper, magnesium and silicon. The weight content of copper oxide was 1.5%, the weight content of magnesium oxide was 2.0%, and the surface of silicon oxide was coated The layer content is 6.0 wt%.

[0040] The obtained carrier S2 is immersed in an aqueous solution containing nickel and tungsten, and then dried at 120°C for 5 hours, and calcined at 560°C for 5 hours to obtain a hydrogen-containing depressurization catalyst N2.

[0041] Example 3

[0042] Will be made of small pore alumina (specific surface 238m 2 ·G -1 , Pore volume 0.48mL·g -1 The binder made of) was added to HZSM-5 molecular sieve (same as Example 1), mixed uniformly, extruded into a shape, dried at 130°C for 4 hours, and calcined at 580°C for 4 hours to obtain a carrier.

[0043] The above-mentioned carrier was immersed in an aqueous solution containing lanthanum oxide of 9wt% lanthanum nitrate in a volume ratio of 1:1.5, and the immersion time was 4 hours. After filtration, the solid phase obtained was dried at 120°C for 5 hours to obtain a lanthanum modified Carrier.

[0044] Add solvent gasoline to ethyl silicone oil to obtain a silicone oil organic mixture with a silicon oxide weight concentration of 20%, and then add the lanthanum-modified carrier to the above silicone oil organic mixture and immerse in a volume ratio of 1:1.5. The immersion time For 3 hours. After filtration, it was dried at 120°C for 4 hours and calcined at 500°C for 8 hours to obtain a carrier S3 modified with lanthanum and silicon, wherein the weight content of lanthanum oxide was 5.5% and the content of silicon oxide surface coating was 6.0% by weight.

[0045] The obtained carrier S3 is immersed in an aqueous solution containing nickel and tungsten, and then dried at 120°C for 5 hours, and calcined at 550°C for 6 hours to obtain a hydrogen-containing depressurization catalyst N3.