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Forming method for spherical aluminium oxide through oil-water column process

A spherical alumina and water column technology, applied in the direction of alumina/hydroxide, etc., can solve the problems of product purity and sphericity, long aging time of oil ammonia column method, environmental pollution, etc., and achieve simple and feasible operation steps, Easy industrial production and high product strength

Active Publication Date: 2015-03-11
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for preparing spherical alumina by the oil-water column method to solve the problems of long aging time, low efficiency and environmental pollution of the oil-ammonia column method described in the technical background, and the product purity of the alginic acid-assisted molding method Problems that cannot be balanced with sphericity

Method used

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  • Forming method for spherical aluminium oxide through oil-water column process

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Effect test

Embodiment 1

[0025] Prepare spherical alumina by the method step of the present invention:

[0026] 100 g of SB powder (pseudo-boehmite) produced by Sasol, Germany, was added to 300 g of a 3% by weight sodium alginate solution, fully stirred to form an alginate-pseudo-boehmite suspension, and set aside.

[0027] In the oil-water column with a height of 1.2m and a diameter of 30cm, the upper oil phase is lubricating oil with a height of 1mm, and the lower water phase is a 0.5mol / L aluminum nitrate solution with a height of 119cm. A pump is used to control the oil level to be stable.

[0028] Drop the alginic acid-pseudoboehmite suspension from the top of the oil-water column through a ball dropper. The drip nozzle at the bottom of the ball dropper is 2cm away from the oil surface. / Second. Suspension droplets shrink into balls in the oil phase, and smoothly pass through the oil-water interface into the water phase, and the droplets gel into solids in the water phase, and are discharged fr...

Embodiment 2

[0031] Prepare gamma-A by the step in embodiment 1 2 o 3 Small balls, the difference is: 500g of sodium alginate solution with a concentration of 2% by weight is added to the ingredients, and it is fully stirred to form an alginic acid-pseudoboehmite suspension; the height of the upper oil phase in the oil-water column is 15cm, and the lower water phase The height is 104cm; the aperture size of the drip nozzle used when dropping the ball is 3.0mm, and the properties of the obtained ball are shown in Table 1.

Embodiment 3

[0033] Prepare gamma-A by the step in embodiment 1 2 o 3 Small balls, the difference is: 700g of sodium alginate solution with a concentration of 0.5% by weight is added during the batching, fully stirred to form an alginic acid-pseudoboehmite suspension, and a 1mm drip tip is used when dropping the balls, and the prepared small balls The properties of the ball are listed in Table 1.

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Abstract

A related forming method for spherical aluminium oxide through an oil-water column process is characterized by comprising: adding pseudo-boehmite into an alginate solution, stirring to form an alginic acid-pseudo-boehmite suspension; dropwise adding the suspension into an oil-water column composed of an upper-layer oil phase and a lower-layer multivalent metal cation salt solution phase to form a composite spherical gel particle; and taking out the gel particle, performing acid processing, and then drying and roasting to obtain the spherical aluminium oxide product. The method has the advantages of fast forming speed, high yield, large product strength, good sphericity degree, no pollution in the preparation process, and the like. Also, the operation steps are simple and practicable, and the method is easy for industrialized production.

Description

technical field [0001] The invention relates to the technical field of catalyst carriers, in particular to an oil-water column forming method for spherical alumina, in particular to a forming method for preparing spherical alumina particles by utilizing the sol-gel performance of alginic acid and adopting the oil-water column method. Background technique [0002] The oil ammonia column method is a common method for preparing spherical alumina, silica and composite supports. It is to drop the sol into the oil ammonia column, the sol particles shrink into balls in the upper oil phase, gel solidify in the lower ammonia water, and the gel particles are aged, dried and roasted to obtain spherical solid particles. The spherical alumina prepared by this method has good sphericity, uniform particle size and high strength, and is widely used as a fixed bed and moving bed catalyst carrier. [0003] Alginic acid is a natural biological material with sol-gel properties and is widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 李晓云杨文建于海斌孙彦民孟广莹于玺姜雪丹王康成宏李世鹏李俊
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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