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A kind of preparation method of hydrocracking catalyst

A hydrocracking and catalyst technology, which is applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem that the active components of the catalyst cannot function efficiently, affect the efficient performance of the acidic function, and the coking failure of the catalyst. Improve the selectivity and nitrogen resistance of medium oil, improve the ability to resist nitrogen poisoning, and improve the utilization rate

Active Publication Date: 2019-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These several preparation methods have their own advantages and disadvantages. The kneading method of active metals and acidic components, carriers, additives, etc. is kneaded together. Due to the limitation of the preparation method, it is impossible to achieve a very uniform dispersion of each active component, which will make the catalyst partially metal or The aggregation of acidic components affects the effective performance of its activity, or the local reaction of the catalyst strongly leads to the coking and deactivation of the catalyst
The impregnation method carrier is generally prepared by kneading method, and the silica-alumina and molecular sieves cannot be uniformly dispersed during the kneading process. The metal is introduced by the impregnation method, and the capillary force between the particles will cause the active components to agglomerate during the drying and roasting process. , forming larger particles, reducing the dispersion of active metals
The co-precipitation method can make the metal and the carrier and the acidic component disperse very uniformly, and form a weak interaction between the active metal and the carrier, but the distribution of the active metal on the catalyst from the inside to the outside is basically uniform. When the catalyst is in contact, some metals that cannot be reached by the reactants will become ineffective components, thereby reducing the utilization rate of active metals; co-precipitation preparation of hydrocracking catalyst molecular sieves is generally dispersed in the precipitation slurry, if not protected, part of the pores It will also be blocked by precipitated particles, so that some functions of the molecular sieve cannot be fully exerted
[0011] CN101172260A discloses a method for preparing a hydrogenation catalyst. The carrier material is amorphous silica-alumina, and molecular sieves are introduced during the gelation process; in the method for preparing a hydrocracking catalyst disclosed in CN101239324A, Y molecular sieves are directly added to the co-precipitation mixture Introduced into the catalyst, the above method can block some pores and affect the efficient performance of its acidic function
[0012] CN1253988A discloses a nitrogen-resistant type prolific middle distillate hydrocracking catalyst, and CN1253989A discloses a heavy hydrocarbon hydrocracking catalyst and its preparation method. The preparation methods of these two catalysts all use active metal and carrier In the co-precipitation method, although the active metal, the carrier and the acidic component can be uniformly dispersed, the co-precipitation of the active metal and the carrier auxiliary agent will cause mutual wrapping, so that some metal components cannot be fully exposed in the bulk phase and become invalid components. points, each active component of the prepared catalyst cannot play a role efficiently

Method used

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  • A kind of preparation method of hydrocracking catalyst
  • A kind of preparation method of hydrocracking catalyst
  • A kind of preparation method of hydrocracking catalyst

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preparation example Construction

[0034] The preparation method of the hydrocracking catalyst provided by the present invention specifically comprises:

[0035] (1) Add alkaline solution B containing tungsten to acidic solution A containing magnesium, aluminum and silicon until the pH is 10-12 to obtain a mixed slurry;

[0036] Prepare magnesium, aluminum, and silicon-containing acidic solution A according to the content ratio of the catalyst components. The aluminum-containing salt can be one or more of aluminum chloride, aluminum nitrate, aluminum sulfate, etc., and the magnesium-containing salt can be magnesium chloride, nitric acid, etc. One or more of soluble magnesium salts such as magnesium and magnesium sulfate, the silicon source can be one or more of water glass, silica sol, etc.; the acidity can be one or more of inorganic or organic acids such as hydrochloric acid, nitric acid, and acetic acid One or more adjustments, it is advisable that the acidic salt solution is not turbid;

[0037] The auxili...

Embodiment 1

[0053] (1) Add 2L of clean water to a gelling tank and raise the temperature to 50°C;

[0054] Add 1.5L of clean water, 30mL of concentrated hydrochloric acid, 970g of aluminum chloride, 50g of magnesium chloride into a container, stir to dissolve, drop in the 2 1L of 131g / L dilute water glass solution, stir evenly, and prepare acidic solution A;

[0055] Prepare 2.2L of sodium hydroxide solution with a concentration of 15wt% in a container, add 46g of sodium tungstate, stir to dissolve, and prepare alkaline solution B;

[0056] Fix the flow rate of the acidic solution A, adjust the flow rate of the alkaline solution B, and flow into the gelation tank, control the gelation temperature at 50°C, the pH of the slurry at 10.8±0.2, and complete the gelation within 30 minutes. When the reaction is over, the A solution and B solution must all be added to the gel tank, and stirred for 10 minutes after the gel is completed;

[0057] (2) Add 2L of clean water to a gelling tank and rai...

Embodiment 2

[0066] Take a part of the shaped bar C3 with a dry basis content of 65wt% prepared in Example 1, spray and soak it with 40mL of an organic acid mixed aqueous solution containing 1.5g of acetic acid and 3.5g of citric acid, then put it into a glass container, and place it in a constant temperature water bath at 50°C. Insulated for 40 minutes; drying and roasting conditions were the same as those in Example 1 to obtain catalyst B of the present invention.

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Abstract

The invention discloses a preparation method of a hydrocracking catalyst. The method comprises the following steps: forming a magnesium / aluminum / silicon-containing acidic solution and a tungsten-containing alkaline solution into mixed slurry; forming a nickel-containing acidic solution and a tungsten-containing alkaline solution into another mixed slurry; mixing the above two kinds of slurry, regulating the pH value, aging, adding mixed and ground Y molecular sieves and high-molecular polyethyleneglycol into the slurry, filtering, and drying; shaping, and drying to a specific degree; and spraying and soaking with a mixed solution of acetic acid and polybasic carboxylic acid, drying, and roasting to obtain the hydrocracking catalyst. The improvement of the hydrogenation activity of the catalyst effectively matches with the acidic function, and the nitrogen tolerance of the catalyst is improved, so that the catalyst has favorable hydrocracking activity and good performance of postponing carbon deposit generation even under the condition of high nitrogen content of a reaction product.

Description

technical field [0001] The invention relates to a preparation method of a hydrocracking catalyst, in particular to a preparation method of a nitrogen-resistant prolific middle distillate oil hydrocracking catalyst. Background technique [0002] In recent years, the rapid development of the world economy has driven the increasing demand for middle distillates in the transportation industry, and the extraction of crude oil has also increased, leading to further expansion of the trend of heavy and inferior crude oil. At the same time, more and more attention has been paid to the harm of pollutants emitted by fuel combustion to the environment on which human beings depend, and stricter environmental protection regulations have also been introduced. As a result, refineries are faced with many arduous tasks such as increasing difficulty in raw material processing, product quality upgrades, and continued strong market demand for middle distillates. [0003] Hydrocracking can conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/16
Inventor 刘东香徐学军王海涛冯小萍
Owner CHINA PETROLEUM & CHEM CORP
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