Preparation method for alumina microsphere

A technology of alumina and microspheres, which is applied in the preparation of alumina microspheres and the field of preparation of alumina microspheres, which can solve the problems of low wear, concentrated particle size, and high production cost, and achieve low wear, concentrated particle size, and easy operation. Effect

Active Publication Date: 2016-03-09
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a novel method for preparing alumina microspheres to solve the problems of complex process, high production cost and difficulty in realizing industrialized production described in the technical background. Concentrated to meet various reactor requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) 100g pseudo-boehmite sample is added to 300ml gellan gum aqueous solution (concentration 2%) at 70°C, the solid content of pseudo-boehmite in the slurry is 25%, forming pseudo-boehmite- Gellan gum suspension.

[0021] (2) Add the above suspension into kerosene at 90°C, and the volume of kerosene is 300ml, start the stirring speed at 500rpm, stir for 15min, and cool the system to 25°C.

[0022] (3) Add aluminum ion solution and continue to stir until the total concentration of aluminum ions is 0.1 mol / L, and gel microspheres can be obtained.

[0023] (4) After the gel particles were washed, they were dried at 100°C for 10 hours, and then calcined at 550°C for 4 hours. The properties of the obtained alumina microspheres are shown in Table 1.

Embodiment 2

[0025] Alumina microspheres were prepared according to the steps in Example 1, except that the added aluminum source was alumina hydrogel, and the solid content in the slurry was 10%. The properties of the obtained microspheres are shown in Table 1.

Embodiment 3

[0027] Alumina microspheres were prepared according to the steps in Example 1, except that the oil phase added was paraffin oil, and the properties of the obtained microspheres were shown in Table 1.

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Abstract

The present invention relates to a preparation method for an alumina microsphere. The preparation method is characterized by comprising the following steps: adding an alumina precursor into a gellan gum solution at the temperature of 65-90 DEG C to form an alumina precursor-gellan gum suspension; and adding the suspension into an oil phase at the temperature of 80-100 DEG C and stirring at high speed, adding into a cation solution after cooling and continuing stirring to obtain a gel microsphere; and washing, drying and firing the gel microsphere to obtain the alumina microsphere. The method has the advantages of high forming speed, no pollution during preparation and low production cost; moreover, the method has simple operational steps and facilitates industrial production; wear of the production is low; a particle size can meet requirements of various reactors.

Description

technical field [0001] The invention belongs to the field of catalyst carriers, and relates to a method for preparing alumina microspheres, in particular to a method for preparing alumina microspheres by using the characteristic of gellan gum and metal ion solution to form a gel. technical background [0002] γ-alumina has a large specific surface, adjustable pore structure, good thermal stability and adsorption performance, and is widely used as a catalyst carrier and its adsorbent. At present, the preparation methods of spherical alumina mainly include: spray granulation, roll forming, oil (ammonia) column forming and water column forming. Among them, the particle size of alumina microspheres prepared by spray drying is tens of microns to hundreds of microns, but the particle size distribution of the product prepared by this method is not uniform, and there is more dust, which causes serious environmental pollution. Roll molding is difficult to prepare micron-sized partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/44B01J32/00B01J21/04B01J35/08B01J13/02B01J13/04
CPCB01J13/02B01J13/043B01J13/046B01J21/04B01J35/08C01F7/441C01P2004/60C01P2004/61
Inventor 于海斌孟广莹杨文建刘艳孙彦民李晓云李世鹏苏少龙夏继平
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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