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Method for preparing alumina carrier with large pore volume

A technology of alumina carrier and large pore volume, which is applied to catalyst carriers, chemical instruments and methods, ceramic products, etc., can solve the problems of large consumption of acid and alkali, large loss of powder pore volume, and small pore volume of alumina carrier, etc. Achieve low wear, simple process and mild conditions

Active Publication Date: 2017-05-31
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing extrusion molding method first needs to produce pseudo-boehmite, the whole process consumes a lot of acid and alkali, and produces a lot of high-salt wastewater. The carrier molding process needs to be dried twice, that is, the preparation of pseudo-boehmite powder needs to be carried out once. Drying, kneading, and extruding require secondary drying, and the pore volume loss of the powder is large during the molding process
The pore volume of the alumina carrier obtained by rolling molding of amorphous alumina is small, and it is mainly used as an adsorbent, and is not suitable as a carrier for oil hydrogenation agent that requires a large pore volume

Method used

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  • Method for preparing alumina carrier with large pore volume

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Fully mix 300g of amorphous alumina with a particle size of 12μm, 120g of urea and 150g of water, then put the mixed material into a ball mill and grind it for 12 hours, then take out the ground material, add 5g of Selina powder, add 150g of water, knead Kneading in the machine to obtain a plastic body, extruded through an orifice plate to make a 3mm cylinder, dried at 120°C for 8 hours, and calcined at 550°C for 5 hours to obtain a cylindrical alumina carrier, its specific surface, pore volume, pore size, particle size, The strength index is shown in Table 1.

Embodiment 2

[0025] Fully mix 300g of amorphous alumina with a particle size of 12μm, 90g of urea and 100g of water, then put the mixed material into a ball mill and grind it for 12 hours, then take out the ground material, add 5g of scallop powder, add 220g of water, knead Kneading in the machine to obtain a plastic body, extruded through an orifice plate to make a 3mm cylinder, dried at 120°C for 8 hours, and calcined at 550°C for 5 hours to obtain a cylindrical alumina carrier, its specific surface, pore volume, pore size, particle size, The strength index is shown in Table 1.

Embodiment 3

[0027] Fully mix 300g of amorphous alumina with a particle size of 20μm, 60g of urea and 60g of water, then put the mixed material into a ball mill and grind it for 24 hours, then take out the ground material, add 2g of sodium carboxymethylcellulose, and add 180g of water , kneaded in a kneader to obtain a plastic body, extruded through an orifice plate to make a 3mm cylinder, dried at 120°C for 8 hours, and calcined at 600°C for 5 hours to obtain a cylindrical alumina carrier. Its specific surface, pore volume, pore diameter, The particle size and strength index are shown in Table 1.

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Abstract

The invention provides a method for preparing an alumina carrier with a large pore volume. The preparation method comprises the following steps: performing solid phase crystal transformation on amorphous alumina under the action of an additive; knitting; molding; drying; sintering to obtain the alumina carrier. The alumina carrier prepared by the method has the characteristics of simple method, low water consumption, low cost, large pore volume and high mechanical strength, and is suitable for the field of various catalysts, particularly for the field of oil product hydrogenation catalysts needing large pore volumes.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, and relates to a method for preparing a large-volume alumina carrier. More specifically, the invention relates to a method of solid-phase crystallization, kneading, molding, drying, and A method for preparing an alumina carrier by calcining. Background technique [0002] Due to its large specific surface area, controllable pore structure, good thermal stability, and strong adsorption capacity, alumina is widely used as a catalyst, catalyst carrier, and adsorbent. When alumina is used as a catalyst or carrier, its properties play a very important role in the performance of the entire catalyst. It is generally required that the crystallinity of alumina should be high, the impurity content should be low, and it should have a suitable specific surface area, pore volume and pore diameter, and also have a certain acidity and acid strength. [0003] Generally speaking, alumina used as...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/10B01J35/10B01J32/00
CPCC04B35/10C04B38/0645C04B2235/96B01J35/635B01J35/647B01J35/615C04B38/0054
Inventor 李晓云于海斌孙彦民耿姗张景成李世鹏夏继平张雪梅周鹏谢献娜
Owner CHINA NAT OFFSHORE OIL CORP
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