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A kind of preparation method of pseudo-boehmite

A pseudo-boehmite and aluminum hydroxide technology, applied in the direction of alumina/aluminum hydroxide, can solve the problem that the pseudo-boehmite index does not change significantly, increase the load of washing and filtering equipment, and increase the pseudo-boehmite Cost and other issues, to achieve the effect of shortening the growth time, particle integrity, and improving crystallinity

Active Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method achieves the purpose of saving water, the indicators of pseudo-boehmite have not changed significantly
Moreover, adding a large amount of seed mother liquor or seed washing liquid to the slurry will consume a large amount of energy to heat up or maintain the aging temperature, which increases the cost of pseudo-boehmite. At the same time, due to the The addition of washing liquid increases the volume of the slurry and also increases the load on the subsequent washing and filtering equipment

Method used

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  • A kind of preparation method of pseudo-boehmite
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Examples

Experimental program
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Effect test

Embodiment 1

[0031] Prepare sodium metaaluminate solution concentration to be 200gAl 2 o 3 / L, a total of 1L, heated to 70°C for use, the concentration of aluminum sulfate solution is 80gAl 2 o 3 / L, a total of 2L, heated to 70°C for use.

[0032] Add 1.0L of distilled water into the gelling tank, heat to 70°C, and flow into the above two slurries to keep the pH value at 8.0, and keep the temperature at 70°C during the gelling process. After the gelation is completed, it enters the aging stage. After gelling, the slurry enters the aging container 7 from the feed port 8. Under the condition of a stirring speed of 150rpm and an electric field strength of 80N / C, the pH value is 8.0, the temperature is 70°C and the time is 60min. Aging is carried out under certain conditions. After the aging is over, open the drain port 5 at the bottom of the interlayer area, and then inject 65°C deionized water from the washing water inlet 9, and wash the aged slurry at a stirring rate of 200rpm. After wa...

Embodiment 2

[0034] The preparation process is the same as that in Example 1, except that the gelling pH value is controlled to 7.0, the gelling temperature is 80°C, the aging time is 100min, and the electric field strength during the aging process is 50N / C, and pseudoboehmite T-2 is prepared. The physical and chemical properties are listed in Table 1.

Embodiment 3

[0036] The preparation process was the same as in Example 1, except that the aging pH value was adjusted to 9.5, the aging time was 30 minutes, and the electric field strength during the aging process was 100 N / C. Pseudo-boehmite T-3 was prepared, and its physical and chemical properties are shown in Table 1.

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Abstract

The invention discloses a preparation method of pseudo-boehmite. The method comprises preparing aluminum hydroxide precipitation, aging, washing, and drying, wherein the aging is carried out in the following container: a filter cloth is arranged in the container along the axial direction, so that the aging container is divided into a sandwich area and a central area, and the central area is arranged There is a stirrer, and the negative and positive electrodes that generate the electric field are placed oppositely in the interlayer area, and the aging conditions are controlled. The method can improve the performance of the pseudo-boehmite and reduce the water consumption in the subsequent washing process.

Description

Technical field [0001] The present invention involves a preparation method of thin water aluminum stone, which specializes in a preparation method with high -crystalline aluminum and aluminum stone. Background technique [0002] γ-Al 2 O 3 As a catalytic material, alumina is very widely used in the field of catalytic, especially in the field of catalytic hydrogenation.Preparation γ-al 2 O 3 The usual method is to make thin water aluminum stones first, and then bake at a certain temperature to transform into γ-al 2 O 3 EssenceThere are many ways to prepare thin water aluminum stone, but it is mainly precipitated by acid or alkali method, such as: [0003] (1) The neutral reaction of aluminum salt and alkaline precipitant, such as aluminum chloride: [0004] AlCl 3 +3nh 4 Oh → al (oh) 3 +3nh 4 CL [0005] (2) The complex decomposition reaction of acid aluminum salt and alkaline aluminum acid salt, such as aluminum sulfate: [0006] AL 2 SO 4 ) 3 +6NAALO 2 +12H 2 O → 8AL (OH) 3 +3A ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 王永林朱慧红刘杰张成关月明
Owner CHINA PETROLEUM & CHEM CORP
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