Hydrodewaxing method for diesel fraction

A technology for depressurizing hydrogen and diesel oil, which is applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problem of reducing the service life of the depressurizing catalyst by hydrogen, the yield of diesel fraction and the limitation of depressing effect, and the temperature drop. Large and other problems, to achieve low cracking activity, the best effect, the effect of increasing the reaction temperature

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
15 Cites 83 Cited by

AI-Extracted Technical Summary

Problems solved by technology

In this method, the temperature drop in the bed of the hydrodepreciation catalyst is relatively large, and the yield of the diesel fraction and...
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Abstract

The invention discloses a hydrodewaxing method for diesel fraction. The method is as follows: a raw material of wax-containing diesel oil sequentially passes through alternatively cascaded hydrodewaxing catalyst beds and hydrofining catalyst beds, and a finally obtained hydrofining product is subjected to separation so as to obtain a product of diesel oil. The method enables average reaction temperature of the hydrodewaxing catalyst beds to be increased, thereby improving the utilization rate of a hydrodewaxing catalyst, prolonging the on-stream period of an apparatus and enhancing yield of the target product.

Application Domain

Technology Topic

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  • Hydrodewaxing method for diesel fraction
  • Hydrodewaxing method for diesel fraction

Examples

  • Experimental program(9)
  • Comparison scheme(1)

Example Embodiment

[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.

Example Embodiment

[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.

Example Embodiment

[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.
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PUM

PropertyMeasurementUnit
Pore volume0.34ml/g
Specific surface area251.0m²/g
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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