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Pseudo-boehmite and preparation method thereof

A pseudo-boehmite and alumina technology, which is applied in the field of pseudo-boehmite and its preparation, can solve the problems of poor adhesiveness of pseudo-boehmite and achieve low apparent density, stable product properties, and high pore volume. big effect

Active Publication Date: 2019-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the present invention provides a pseudo-boehmite and a preparation method thereof. The preparation method adopts a two-stage continuous synthesis reaction, and a treatment agent is added during the preparation to form pseudo-boehmite crystals with equal particle diameters. particles, and the preparation process does not require aging operations, which solves the problem of poor adhesiveness of the pseudo-boehmite prepared in the prior art

Method used

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  • Pseudo-boehmite and preparation method thereof

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Effect test

Embodiment 1

[0045] Add 150mL water to the first reactor (volume 500mL), then continuously add sodium metaaluminate solution (180gAl 2 o 3 / L), the flow rate is 0.8L / h and the first acidic aluminum sulfate solution (80 gAl 2 o 3 / L), the flow rate is 1.5L / h, the pH value of the solution is adjusted to 5.5, and the gelling temperature of the first reactor is controlled to 70°C. Add 0.5wt% polyacrylamide solution to the slurry obtained after the reaction, and enter the second reactor (volume 500mL) at a flow rate of 1.5L / h. Then add 1.0mol / L sodium carbonate solution concurrently, the flow rate is 0.7L / h and the second acidic aluminum sulfate (30gAl 2 o 3 / L) solution, flow rate 0.5L / h and polyethylene glycol (molecular weight: 10000) 0.75g / h, adjust the pH value of the solution to 8.5, and control the gelling temperature of the second reactor to 60°C. After the reaction, the obtained suspension was washed under washing water at 60°C, dried at 120°C for 4 hours to obtain pseudo-boehmite...

Embodiment 2

[0047] The other preparation conditions are the same as in Example 1, except that the pH value of the first reactor solution is adjusted to 6, the gelling temperature of the first reactor is 80°C, the concentration of treatment agent A is 0.6%, and the flow rate is 1.0L / h. Diaspore B and Alumina B.

Embodiment 3

[0049] The other preparation conditions are the same as in Example 1, except that the treatment agent A is replaced by isopropanolamine, the pH value of the solution in the second reactor is adjusted to 10, and the gelling temperature in the second reactor is 40°C, and pseudo-boehmite C and Aluminum oxide C.

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Abstract

The invention provides pseudo-boehmite and a preparation method thereof, wherein the particles with a particle size of less than 20 [mu]m account for less than 10%, the particles with a particle sizeof 20-50 [mu]m account for 75-95%, and the particles with a particle size of more than 50 [mu]m account for less than 15%. According to the present invention, the preparation method adopts a two-stagecontinuous synthesis reaction, and a treatment agent is added in the preparation process to form pseudo-boehmite grains with the equal grain size, wherein the preparation process does not require theaging operation so as to solve the problem of poor adhesion of the pseudo-boehmite prepared in the prior art.

Description

technical field [0001] The invention relates to a catalytic carrier material and a preparation method thereof, in particular to a pseudo-boehmite and a preparation method thereof. Background technique [0002] Activated alumina has good specific 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. γ-Al 2 o 3 Generally, it is obtained by high-temperature dehydration of its precursor pseudo-boehmite, so the morphology, particle size and aggregation state of its precursor pseudo-boehmite determine the surface physical and chemical properties of alumina. Therefore, in order to obtain an alumina carrier with relatively concentrated pore size, the size of the precipitated pseudo-boehmite particles must be uniform. Ono et al. proposed the pH swing method, that is,...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 朱慧红金浩孟兆会葛海龙杨光孙素华杨涛
Owner CHINA PETROLEUM & CHEM CORP
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