Method and device for preparing boehmite powder by using esterification reaction hydrothermal method

A boehmite powder, esterification technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of long reaction time, low production efficiency and high reaction temperature of hydrothermal method

Active Publication Date: 2012-10-17
TAISHAN MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current preparation method has the problems of long reaction time of hydrothermal method, high reaction temperature needs to be maintained for a long time, relatively high energy consumption of producing boehmite powder alone, and low production efficiency

Method used

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  • Method and device for preparing boehmite powder by using esterification reaction hydrothermal method
  • Method and device for preparing boehmite powder by using esterification reaction hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0046] Embodiment 2: at first, the dehydrated alcohol of 30ml (0.5mol) glacial acetic acid and 50ml is joined in the liner in the hydrothermal reaction kettle 21, the theoretical water yield of the esterification reaction of the present embodiment is 0.5mol, i.e. 9 grams, Considering the solubility of aluminum nitrate in water, and properly leaving a surplus, so adding 0.01 mole of aluminum nitrate and 0.02 mole of urea, the degree of filling in the hydrothermal reactor 21 is controlled at 80%, and the sealed hydrothermal reactor 21, Put it in the electric heating constant temperature blast drying box 22, control the hydrothermal temperature at 180°C, react for 18 hours, and naturally cool to room temperature after the reaction; finally open the hydrothermal reaction kettle 21, and pour out the upper liquid layer of the inner tank , remain as the esterification product; then, pour the white precipitate and a small amount of solution at the bottom into the centrifugal test tube ...

Embodiment 3

[0047] Embodiment 3: at first, the dehydrated alcohol of 30ml (0.5mol) glacial acetic acid and 50ml is joined in the liner in the hydrothermal reaction kettle 2l, and the theoretical water output of present embodiment esterification reaction is 0.5mol, i.e. 9 grams, Considering the solubility of aluminum chloride in water, and properly leaving a surplus, so add 0.015 moles of aluminum chloride and 0.03 moles of urea, the filling degree in the hydrothermal reaction kettle 21 is controlled at 80%, and the sealed hydrothermal reaction kettle 21. Put it in the electric heating constant temperature blast drying oven 22, control the hydrothermal temperature at 160°C, react for 12 hours, and naturally cool to room temperature after the reaction; finally open the hydrothermal reaction kettle 2l, and remove the upper liquid layer of the inner tank Pour it out and keep it as an esterification product; then, pour the white precipitate and a small amount of solution at the bottom into a ce...

Embodiment 4

[0048] Embodiment 4: at first, the dehydrated alcohol of 45ml (0.6mol) propionic acid and 35ml is joined in the liner in the hydrothermal reaction kettle 21, and the theoretical water yield of the esterification reaction of the present embodiment is 0.6mol, namely 10.8 grams, Considering the solubility of aluminum chloride in water, and appropriately leaving a surplus, so add 0.02 mole of aluminum chloride and 0.04 mole of urea, the filling degree in the hydrothermal reactor 2l is controlled at 80%, and the sealed hydrothermal reactor 21. Place it in an electric heating constant temperature blast drying oven 22, control the hydrothermal temperature at 150°C, react for 24 hours, and cool to room temperature naturally after the reaction; finally open the hydrothermal reaction kettle 21, and remove the liquid layer on the upper part of the liner. Pour it out and keep it as an esterification product; then, pour the white precipitate and a small amount of solution at the bottom into...

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Abstract

The invention provides a method and a device for preparing boehmite powder by using an esterification reaction hydrothermal method, which belongs to the field of chemical production technology. Organic acid, organic alcohol, urea and aluminum salt are mixed to react for 6-24 hours when the temperature of the water is 120-200 DEG C. The mixture is cooled naturally to room temperature after reaction. The upper liquid layer is poured out to be reserved as an esterification product. The white precipitate at the bottom and small amount of solution are centrifugally separated, washed by 95% ethanol and absolute ethyl alcohol and placed in a vacuum oven to be dried for 4-8 hours under 80-100 DEG C; The preparation of boehmite ultrafine powder is completed in a liquid phase for only one time. And the water generated by the esterification reaction is used to hydrolyze urea slowly. The reaction with aluminum salt is conducted under hydrothermal condition without additive. The post-treatment process is simple and the morphology of the product is regular. Consuming water generated by the esterification reaction through the hydrolysis of urea can promote the equilibrium movement of the esterification reaction, accelerate the progress of esterification reaction and shorten the reaction time.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a method and a device for preparing boehmite powder by an esterification reaction hydrothermal method. Background technique [0002] Boehmite, also known as boehmite, is a white powder with a molecular formula of γ-AlOOH. The important application value of boehmite is to prepare alumina powder which is widely used in industry after calcination. alumina products. Second, due to the comparison of molecular structure, boehmite can be regarded as aluminum hydroxide (Al(OH) 3 ) loses a molecule of water, so starting from boehmite, calcined to prepare alumina, the energy consumption is significantly lower than that of calcined aluminum hydroxide. To sum up, the first preparation of boehmite with different shapes is a shortcut to finally obtain alumina powders with corresponding shapes. Therefore, boehmite is also called the precursor of alumina. [0003] Us...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 吴秀勇
Owner TAISHAN MEDICAL UNIV
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