Aluminum hydroxide and preparation method thereof

A technology of aluminum hydroxide and oxide, which is applied in the preparation of aluminum oxide/hydroxide, etc., can solve the problems that it is difficult to fully contact the organic pore expander with the colloid, the preparation process is complicated, the pore distribution is not concentrated, and the cost is low. , simple process, large aperture effect

Active Publication Date: 2010-01-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods all add organic pore-enlarging agent in the beating process after the gel is formed. This method not only has a long production process, but the preparation process is more complicated, and because of the high viscosity of the colloid, it is difficult to make the organic pore-enlarging agent and the colloid fully Contact, resulting in non-concentrated pore distribution, resulting in a large number of small pores

Method used

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  • Aluminum hydroxide and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Take industrial-grade aluminum hydroxide powder and industrial-grade sodium hydroxide to configure a concentration of 365gAl 2 o 3 / L of concentrated sodium metaaluminate solution, then diluted to a concentration of 25gAl 2 o 3 / L of sodium metaaluminate solution, control the gelling temperature at 29°C, add the condensation product of organic pore-enlarging agent alkylphenol and ethylene oxide (OP-10) and polyoxyethylene sorbitan monooleate ( T-80), wherein the weight ratio of OP-10 and T-80 is 60:40, the amount of organic pore expander accounts for 0.6% of the weight of sodium metaaluminate, diesel oil is used as defoamer, and the amount of defoamer is organic pore expander 0.5% by weight with air and CO 2 The mixed gas, the flow rate is 0.8m 3 / h.(m 3 Sodium metaaluminate solution), where CO 2 The volume fraction of the mixture is 50%, and the mixed gas is used to stir, and the gelation stops when the pH value drops to 10. The slurry was washed with deionized ...

Embodiment 2-3

[0032] The preparation method of aluminum hydroxide is identical with embodiment 1, and its difference is that the concentration of concentrated sodium metaaluminate solution is diluted to 30gAl respectively 2 o 3 / L, 35gAl 2 o 3 / L, the physicochemical properties of the obtained aluminum hydroxide are shown in Table 1 after roasting.

Embodiment 4-5

[0034] The preparation method of aluminum hydroxide is the same as that of Example 1, the difference is that the defoamer diesel oil is changed into silicone oil and glycerol respectively, and the consumption is 0.7% of the pore-enlarging agent weight. The physicochemical properties of the obtained aluminum hydroxide after roasting are shown in Table 1.

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Abstract

The invention discloses aluminum hydroxide and a preparation method thereof. The aluminum hydroxide is prepared by a carbonization method and contains over 94 weight percent of pseudo-boehmite. The method comprises the following steps: adding a small amount of organic pore-expanding agent and defoaming agent into aqueous solution of sodium metaaluminate; introducing a mixed gas of air and CO2 into the solution to stir the solution to form one-step gel; generating evenly grained pseudo-boehmite; and roasting the evenly grained pseudo-boehmite to obtain alumina with a large pore volume, a large aperture and concentrated pore distribution. The aluminum hydroxide is suitable to be used as a component of absorbent or catalyst carrier, particularly a component of a heavy oil or residual oil hydrodemetallization catalyst carrier.

Description

technical field [0001] The invention relates to aluminum hydroxide and a preparation method thereof, in particular to aluminum hydroxide with large pore volume and large pore diameter suitable for use as a hydrodemetallization catalyst carrier component and a preparation method thereof. Background technique [0002] There are many types of alumina such as γ-, η-, θ-, δ-, and α-Al 2 o 3 etc., where γ- and η-Al 2 o 3 For the commonly used activated alumina. [0003] Activated alumina has a good surface area and pore structure, especially γ-Al 2 o 3 Due to its large specific surface area, adjustable pore structure and good thermal stability, it is widely used as catalyst carrier, desiccant and adsorbent in oil refining, petrochemical and fertilizer industries. Preparation of γ-Al 2 o 3 The usual method is to prepare pseudo-boehmite first, and then roast it at a certain temperature to convert it into γ-Al 2 o 3 . Pseudo-boehmite generally has three preparation methods...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30
Inventor 付秋红王永林杨刚
Owner CHINA PETROLEUM & CHEM CORP
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