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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 the improvement of the depreciation effect are limited to a certain extent, which reduces the service life of the hydrodecondensation catalyst.

Method used

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  • Hydrodewaxing method for diesel fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0034] Add cyclohexane to dimethyl silicone oil to obtain a silicone oil-organic mixed solution with a silicon oxide weight concentration of 15%, and then add the zinc-modified carrier to the above-mentioned silicone oil-organic mixed solution to impregnate in equal volume for 3 hours . After filtration, it was dried at 100° C. for 4 hours and calcin...

Embodiment 2

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

[0038] Add the above-mentioned support to the aqueous solution of 3wt% copper nitrate and 3wt% magnesium nitrate with the content of copper oxide and immerse in the aqueous solution of magnesium nitrate with a volume ratio of 1: 1.5. The immersion time is 4 hours. After filtering, the solid phase obtained is passed through 120 °C for 5 hours to obtain a copper- and magnesium-modified support.

[0039] Add solvent gasoline to ethyl silicone oil to obtain a silicone oil-organic mixed solution with a silicon oxide weight concentration of 20%, and then add the copper and magnesium-modified carrier to the above-mentioned silicone oil-organic mixed solution at a volume ratio of 1:1.5 for impregnation, The soaking time ...

Embodiment 3

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

[0043] Add the above carrier to an aqueous solution with a lanthanum oxide content of 9 wt% lanthanum nitrate and impregnate at a volume ratio of 1:1.5 for 4 hours. After filtering, the obtained solid phase is dried at 120°C for 5 hours to obtain lanthanum-modified carrier.

[0044] Add solvent gasoline to ethyl silicone oil to obtain a silicone oil-organic mixed solution with a silicon oxide weight concentration of 20%, then add the lanthanum-modified carrier to the above-mentioned silicone oil-organic mixed solution for immersion at a volume ratio of 1:1.5, and 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 modifi...

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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.

Description

technical field [0001] The invention relates to a method for hydrogenation of diesel oil, in particular to a method for hydrogenation decondensation of waxy diesel oil. Background technique [0002] Diesel products mainly come from straight-run diesel and secondary processed diesel. The raw materials not only contain impurities such as sulfur and nitrogen, but also contain wax components. The usual dewaxing method is to use hydrogen decondensation technology, which has attracted much attention because of its advantages of low investment, low operating cost, strong adaptability to raw materials, mild operating conditions, and large freezing point depression. [0003] Hydrodecondensation of diesel oil means that in the presence of hydrogen, the content of wax molecules in waxy diesel raw materials is reduced on the surface of a suitable catalyst. The principle of dewaxing is that under certain operating conditions, the raw material is mixed with hydrogen and contacted with t...

Claims

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Application Information

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IPC IPC(8): C10G65/12
Inventor 李永泰孟祥兰高鹏
Owner CHINA PETROLEUM & CHEM CORP
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