Alumina carrier and its preparation method

A technology of alumina carrier and boron compound, which is applied in the direction of catalyst carrier, chemical instrument and method, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of increasing the pore volume and diameter of the carrier, destroying the structure of alumina particles, Reduce the problems of carrier pore volume and pore diameter, achieve better pore expansion effect, excellent diffusion performance, and high proportion of macropores

Active Publication Date: 2019-07-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In addition, in the existing alumina carrier preparation technology, acidic substances such as nitric acid, acetic acid, and aluminum nitrate must be added as peptizers when alumina is formed, and the addition of acidic substances will destroy the particle structure of alumina and reduce the pore size of the carrier. volume and aperture
Reducing the damage of acidic peptizer to alumina pore structure is an effective technical route for preparing macroporous alumina carrier. For example, CN1154668 and CN1611578 both add a certain amount of ammonia to partially neutralize the peptizing acid during the kneading process of alumina. In order to achieve the purpose of increasing the pore volume and pore size of the carrier, but this method cannot completely eliminate the adverse effects of acidic substances on the pore structure of the carrier, and the effect is limited.

Method used

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  • Alumina carrier and its preparation method
  • Alumina carrier and its preparation method
  • Alumina carrier and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Weigh 500 g of macroporous pseudoboehmite dry rubber powder (dry basis content 71.5wt%) produced by Yantai Henghui Chemical Co., Ltd., and add hydroxypropyl powder with a viscosity of 150,000 mPa·s (referring to the viscosity of a 2% aqueous solution). 10.7g of methyl cellulose, 53.6g of polyvinyl alcohol powder with a specification of 17-88, mix well; dissolve 40.9g of boric acid in 570g of clean water, slowly add to the above-mentioned materials, knead into a plastic body, and then extrude in a single screw Extrude into a clover shape with a diameter of 1.6mm on a strip machine. Dry at 120°C for 2.0 hours, and process at 300°C for 3 hours. Take 100g of treated particles, spray 64.0g of deionized water evenly on the obtained alumina carrier at a speed of 30mL / min, and evenly add 16.0g of glacial acetic acid to the aforementioned deionized water at a speed of 4.0g / min while spraying water . After spraying to the saturated water absorption rate of the particles, let st...

Embodiment 2

[0053] Weigh the aforementioned pseudo-boehmite 500g, add 3.6g of hydroxypropyl methylcellulose with a viscosity of 150,000 mPa·s (referring to the viscosity of a 2% aqueous solution), and 28.6g of polyvinyl alcohol powder with a specification of 17-99 , and mix evenly; 20.5 grams of boric acid was dissolved in 570 g of clean water, molded and dried according to the aforementioned method, and treated at 200° C. for 4 hours. Take 100g of treated particles, spray 48.0g of 5.0wt% acetic acid solution evenly on the material, and finally spray 32.0g of 15.0wt% acetic acid solution on the obtained material, and let stand at 20°C for 3.0 hours . The same method as in Example 1 was dried and calcined to obtain carrier B, the properties of which are shown in Table 1.

Embodiment 3

[0055] Take by weighing 500g of the aforementioned pseudo-boehmite, add 17.9g of hydroxyethyl methylcellulose and 28.6g of boron oxide with a viscosity of 100,000 mPa·s (referring to the viscosity of a 2% aqueous solution) and mix uniformly; 31.0 grams of boric acid and the specification Dissolve 17.9 g of polyvinyl alcohol powder of 17-88 in 570 g of clean water, shape and dry according to the aforementioned method, and treat at 450° C. for 1 hour. Get 100g of processed particulate matter, spray 28.0g concentration of 1.0wt% nitric acid on the obtained material, continue to spray 28.0g concentration of 5.0wt% nitric acid solution on the material, and finally spray 24.0g concentration of 10.0wt% % nitric acid solution evenly sprayed on the material, 100 ° C for 0.5 hours. The same method as in Example 1 was dried and calcined to obtain carrier C, the properties of which are shown in Table 1.

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Abstract

The invention provides an alumina carrier and a preparation method thereof. The carrier provided by the invention has a pore volume of 0.5 to 1.5 mL / g and a specific surface area of 80 to 300 m2 / g, comprises a certain proportion of a macroporous structure with a pore size of 500 nm or above, and has an average pore diameter gradually enlarged from the center to the outer surface of a carrier particle. The method provided by the invention comprises the following steps: mixing hydrated alumina with a non-acid adhesive and a composite pore-enlarging agent, carrying out molding, drying and precalcination, and subjecting a precalcined material to treatment with acidic solutions with gradually increased concentrations. The alumina carrier provided by the invention has the characteristics of large pore volume, large pore diameter and wide pore channel, has excellent diffusion performance, and can be used as a catalyst carrier, especially as a residual oil hydrodemetalization catalyst carrier.

Description

technical field [0001] The invention relates to an alumina carrier and a preparation method thereof, more specifically to an alumina carrier having the characteristics of a bimodal pore structure and a radial gradient increase in pore diameter and a preparation method thereof. The alumina carrier of the present invention can be used as a hydrogenation catalyst carrier, especially a residual oil hydrodemetallization catalyst carrier. Background technique [0002] Inferior heavy oil such as residual oil contains high metal impurities such as Ni and V, which usually need to be removed by hydrotreating in order to produce clean gasoline, diesel and other oil products and chemical products through subsequent processing (such as catalytic cracking). raw material. Studies have shown that low-quality heavy oils such as residual oil contain a large amount of colloids and asphaltenes. These substances have large molecular weights, complex structures, and difficult diffusion. Therefor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/04B01J35/10B01J23/883C10G45/08
CPCB01J21/04B01J23/002B01J23/883B01J35/1014B01J35/1019B01J35/1042B01J35/1047B01J35/1071B01J35/1076B01J35/109B01J2523/00C10G45/08B01J2523/31B01J2523/68B01J2523/847
Inventor 程涛赵愉生姚远谭青峰崔瑞利于双林张春光赵元生由慧玲宋俊男张天琪陈芬芬
Owner PETROCHINA CO LTD
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