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A kind of preparation method of hydrodesulfurization catalyst

A hydrodesulfurization and catalyst technology, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Hydrogen removal of carbon residue reaction and other problems, to achieve the effect of improving coverage, improving hydrodesulfurization activity, and improving carbon residue removal activity

Active Publication Date: 2022-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pore size of the catalyst prepared by this method is small, which is not conducive to the entry of residue reactant molecules. In addition, the activity of the catalyst for hydrogenation and carbon removal needs to be further improved.
[0004] CN1205314C discloses a method for preparing heavy oil hydrogenation demetallization and desulfurization catalysts. The carrier is composited with two kinds of alumina, one of which is alumina powder calcined at 1100°C. The pores are penetrating, but they are still too small for the asphaltene micelles, which is not conducive to the hydrodesulfurization and hydrodecarbonization reactions of residual oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Weigh 14.5 grams of activated carbon with a particle size of 5 microns, and immerse it in 100 mL of aluminum nitrate solution with a mass concentration of 7.5% in terms of alumina for 2 hours. Immersion in the ammonia solution for 3 hours, wherein the volume of ammonia water is 12 times the volume of the physical pore expander activated carbon, the immersed activated carbon is dried at 120 ° C for 4 hours, and roasted at 450 ° C for 4 hours under a nitrogen protective atmosphere.

[0052] The activated carbon after the above-mentioned roasting was mixed with 125 grams of pseudo-boehmite and 3 grams of succulent powder, and an appropriate amount of acetic acid aqueous solution with a mass concentration of 1.5% was added and kneaded. The intermediate was obtained by calcining at 700°C for 5 hours in an air atmosphere.

[0053] Weigh 100 grams of above-mentioned intermediates, place in 550 grams of ammonium bicarbonate solution, the mass concentration of this ammonium bica...

Embodiment 2

[0056] Same as Example 1, except that the activated carbon is changed to charcoal with a particle size of 6 microns, the charcoal addition is 16.5 grams, the mass concentration of aluminum nitrate is 8.5% in terms of alumina, and the mass concentration of ammonia water is 25%. The mass of the ammonium bicarbonate solution is 450 grams, and the mass concentration of the ammonium bicarbonate solution is 20.5%. The sealing pretreatment temperature was 90°C, the treatment time was 2 hours, the heat treatment temperature was 140°C, and the treatment time was 7 hours to obtain a hydrodesulfurization catalyst Cat-2. The properties of the catalyst are shown in Table 1. Among them, the length of the modified alumina-based carrier is mainly 1.5-5.5 μm in the length of the rod-shaped modified alumina in the micron-scale pores, and the length of the rod-shaped modified alumina on the outer surface of the main modified alumina is mainly 3-8 μm. , the diameter of the modified alumina is 80-...

Embodiment 3

[0058] Same as Example 1, except that the particle size of activated carbon is 7 microns, the addition amount is 13.5 grams, the mass concentration of aluminum nitrate is 9.5%, and the mass concentration of ammonia water is 30%. The mass of the ammonium bicarbonate solution is 650 grams, and the mass concentration of the ammonium bicarbonate solution is 15.5%. The heat treatment temperature was 130° C. and the treatment time was 7 hours to obtain a hydrodesulfurization catalyst Cat-3. The properties of the catalyst are shown in Table 1. Among them, the length of the modified alumina-based carrier is mainly 2.0-6.0 μm in the length of the rod-shaped modified alumina in the micron-scale pores, and the length of the rod-shaped modified alumina on the outer surface of the main modified alumina is mainly 3-8 μm. , the diameter of the modified alumina is 100-260 nm, the coverage of the rod-shaped modified alumina on the outer surface of the main modified alumina is about 90%, and th...

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Abstract

The invention discloses a preparation method of a hydrodesulfurization catalyst. The method comprises: (1) sequentially adsorbing an aluminum salt solution and an alkaline solution by a physical pore-enlarging agent, then drying and calcining to obtain a modified physical pore-enlarging agent; (2) applying the modified physical pore-enlarging agent obtained in step (1) to (3) The intermediate obtained in step (2) is immersed in ammonium bicarbonate solution, and then sealed and heat-treated. After heat treatment, the material is dried and calcined to obtain an intermediate. Modified alumina-based carrier; (4) Impregnating the modified alumina-based carrier obtained in step (3) with the hydrogenation active metal component impregnation liquid, drying and calcining to obtain a hydrodesulfurization catalyst. The hydrodesulfurization catalyst prepared by the method has the characteristics of good macromolecular diffusion performance, strong desulfurization ability and high residual carbon removal rate.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a preparation method of a residual oil hydrodesulfurization catalyst. Background technique [0002] With the increasing weight and quality of oil, it brings more and more difficulties to oil processing. Heavy oil residues contain a large amount of sulfur, most of which are contained in asphaltenes, which are difficult to remove. As an important process in petroleum refining and synthetic ammonia production using petroleum as raw material, hydrodesulfurization has always received attention. However, in recent years, the quality of petroleum has become heavier and worse, while the requirements for product quality are more stringent, and the requirements for feedstock in subsequent processes are also becoming more and more stringent. In addition, since human beings entered the 21st century, people's awareness of environmental protection has been continuously enhanced, and envir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/883B01J35/10B01J37/10B01J37/08C10G45/08
CPCB01J23/883B01J35/1019B01J35/1042B01J37/10B01J37/08C10G45/08Y02P20/52
Inventor 隋宝宽季洪海彭冲吕振辉
Owner CHINA PETROLEUM & CHEM CORP
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