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Fluorine-containing hydrated alumina forming composition and preparation method thereof

A technology of hydrated alumina and moldings, applied in chemical instruments and methods, chemical/physical processes, catalyst carriers, etc., can solve the problems of inability to use adsorbents or carriers, and achieve low water absorption and high radial crushing strength. Effect

Active Publication Date: 2012-11-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The alumina hydrate moldings prepared according to the traditional method are easy to pulverize when encountering water or aqueous solution. Therefore, the alumina hydration moldings or fluorine-containing alumina hydration moldings cannot be directly used as adsorbents or carriers.

Method used

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  • Fluorine-containing hydrated alumina forming composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Get the pseudo-boehmite powder 100g produced by Catalyst Changling Branch Company, add 4.0g methylcellulose, 3.0g squash powder, 4.5g NH 4 F and 95mL deionized water, fully stirred and mixed evenly, after kneading evenly by an extruder, extruded to obtain a wet strip of formed product of hydrated alumina. The wet strips were dried in an oven at 150°C for 12 hours. The radial crushing strength, water absorption rate and δ value of the molded carrier after drying were measured, and the results are listed in Table 1.

Embodiment 2

[0041] Get 50g of pseudo-boehmite powder produced by Catalyst Changling Branch Company, 50g of self-made amorphous aluminum hydroxide powder, add 2.0g methylcellulose, 3.0g hydroxyethylmethylcellulose, 8.5g NH 4 F and 95mL deionized water, fully stirred and mixed evenly, after kneading evenly by extruder, extruded to obtain the wet molding of aluminum hydroxide. Place the wet aluminum hydroxide molding in an oven at 220°C to dry for 6 hours. The radial crushing strength, water absorption rate and δ value of the molded carrier after drying were measured, and the results are listed in Table 1.

Embodiment 3

[0043] Get 60g of pseudo-boehmite powder produced by Catalyst Changling Branch, 40g of aluminum hydroxide trihydrate, add 1.0g of methylcellulose, 2.0g of hydroxypropylmethylcellulose, 3.0g of turnip powder, 40.0% HF solution 5mL and 95mL of deionized water, fully stirred and mixed evenly, after kneading evenly by extruder, extruded to obtain the wet molding of aluminum hydroxide. Place the wet aluminum hydroxide molding in an oven at 80°C for 12 hours to dry. The radial crushing strength, water absorption rate and δ value of the molded carrier after drying were measured, and the results are listed in Table 1.

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Abstract

The invention discloses a fluorine-containing hydrated alumina forming composition and a preparation method thereof. The forming composition contains hydrated alumina, a fluorinated compound and cellulose ether; and the radial crushing strength of the forming composition is more than or equal to 12N / mm, water absorption is 0.4 to 1.5, and the delta value is less than or equal to 10 percent, wherein delta is obtained according to a formula delta=((Q1-Q1) / Q1)*100 percent, Q1 is the radial crushing strength of the fluorine-containing hydrated alumina forming composition, and Q2 is the radial crushing strength of the fluorine-containing hydrated alumina forming composition which is soaked in water for 30 minutes and then is dried. The fluorine-containing hydrated alumina forming composition is high in radial crushing strength and water absorption, and is low in strength loss rate after absorbing water, and can be directly used as adsorbent or a carrier without being roasted.

Description

technical field [0001] The invention relates to a hydrated alumina molding and a preparation method thereof, in particular to a fluorine-containing hydrated alumina molding and a preparation method thereof. Background technique [0002] In traditional methods, alumina, especially γ-alumina, is often used as a carrier for adsorbents or supported catalysts because of its good pore structure, specific surface area and thermal stability. The properties of alumina can be adjusted by introducing auxiliary agent fluorine into it to meet certain specific requirements. For example, a hydrofinishing catalyst is prepared by using a fluorine-containing alumina carrier to adjust the hydrofinishing performance of the catalyst. This kind of alumina is usually formed from hydrated alumina, such as pseudo-boehmite, which is formed, dried, and calcined at high temperature, and then fluorine is introduced by impregnating, drying, and calcining. [0003] The alumina hydrate moldings prepared ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30B01J32/00B01J27/12
Inventor 杨清河曾双亲李丁健一刘滨孙淑玲任亮聂红李大东
Owner CHINA PETROLEUM & CHEM CORP
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