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Preparation method of alumina carrier

A technology of alumina carrier and aluminum hydroxide, which is applied in alumina/hydroxide preparation, catalyst carrier, chemical instruments and methods, etc., can solve the problems of unfavorable industrial application of catalysts, increase in the proportion of small pores, etc., and achieve the number of small pores. The effect of reducing, slowing down the rate of deactivation, and increasing utilization

Active Publication Date: 2013-05-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the above technology, the pore expander is added to the alumina dry rubber powder at the same time as the acid solution. Although the pore structure can be improved, the small hole ratio of the carrier is significantly increased compared with the unformed alumina powder, which is not conducive to the industrial use of catalysts. application

Method used

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preparation example Construction

[0023] According to the preparation method of the alumina carrier provided by the invention, its specific steps are as follows:

[0024] (1) Prepare a surface active substance and add it to water and / or alcohol to prepare a wetting solution. The weight of the wetting solution accounts for 10% to 100% of the weight of the alumina dry rubber powder, and the amount of the surface active substance added is 1%~20% of the weight of aluminum hydroxide dry rubber powder;

[0025] (2) Weigh the required aluminum hydroxide dry rubber powder and selectively added extrusion aids, mix them evenly, and the mixing time is 5 to 15 minutes, and can be mixed in machines such as kneaders and rollers;

[0026] (3) Add the wetting liquid obtained in step (1) into the mixed material obtained in step (2) in the form of a spray. The time for adding the wetting liquid is 1-15 minutes. The wetting liquid fully reacts with the dry aluminum hydroxide powder;

[0027] (4) Slowly add the peptizer or pept...

Embodiment 1

[0034]Weigh 15 g of lauryl dimethyl amine oxide, stir and dissolve in 80 g of water to prepare a wetting solution. Take 190g of macroporous aluminum hydroxide dry rubber powder, 10g of SB powder, add 8g of citric acid and 8 g of squid powder, and mix well. Spray the wetting liquid evenly on the above-mentioned mixed materials, and the spraying time is 5 minutes. Mix the materials for 10 minutes after the wetting liquid is sprayed. Then uniformly add 60 g of nitric acid aqueous solution, wherein the concentration of nitric acid is 7 wt%. The material was kneaded for 15 minutes, then rolled for 20 minutes, and extruded with a clover orifice plate with a diameter of 1.7mm. Dry at 120°C for 4h and then bake at 500°C for 4h. The calcined carrier is designated as A.

Embodiment 2

[0036] Weigh 5 g of oleyl dimethyl benzyl ammonium chloride and cocamidopropyl betaine respectively, stir and dissolve in 100 g of water to prepare a wetting solution. Take 190g of macroporous aluminum hydroxide dry rubber powder, 10g of SB powder, add 8g of citric acid and 8 g of squid powder, and mix well. Spray the wetting liquid evenly on the above-mentioned mixed materials, and the spraying time is 5 minutes. Mix the materials for 10 minutes after the wetting liquid is sprayed. Then uniformly add 40 g of nitric acid aqueous solution, wherein the concentration of nitric acid is 10.5 wt%. The material was kneaded for 15 minutes, then rolled for 20 minutes, and extruded with a clover orifice plate with a diameter of 1.7 mm. Dry at 120°C for 4h and then bake at 500°C for 4h. The calcined carrier is designated as B.

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Abstract

The invention discloses a preparation method of an alumina carrier. The method includes: taking aluminum hydroxide dry glue powder, first wetting it by a wetting liquid containing a surface active material, conducting mixing or kneading, then adding a peptizing acid, and carrying out mixing and kneading, molding, drying and roasting, thus obtaining the alumina carrier. The method can maintain the original pore structure of dry glue powder so as to avoid the increase of small pores formed at a second time. The catalyst prepared from the carrier can increase the diffusion coefficient of reactant molecules so as to improve reaction activity. And the reduction of the small pore number also slows down the inactivation rate of the catalyst in a heavy oil hydrotreating process.

Description

technical field [0001] The invention relates to a method for preparing an alumina carrier, in particular to a method for preparing a catalyst carrier suitable for heavy distillate oil hydrogenation treatment. Background technique [0002] At present, the world's crude oil is gradually becoming heavier, and the deep processing and utilization of heavy oil has received extensive attention. The core of heavy distillate hydrotreating technology is the catalyst. The performance of the catalyst is not only related to the type of promoter, the type of active species and the preparation method of the catalyst, but also closely related to the pore structure of the catalyst. Because the reactant molecules are large in wax oil hydrotreating, if the pore size is too small, it may lead to diffusion limitation. Conversely, if the pore size is too large, the specific surface area of ​​the catalyst will be reduced, thereby reducing the activity of the catalyst. The pore structure of the c...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04B01J35/10B01J21/12B01J21/06B01J23/06B01J21/10C01F7/30B01J27/19C10G45/08
Inventor 杨占林唐兆吉姜虹王继锋魏登凌温德荣
Owner CHINA PETROLEUM & CHEM CORP
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