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Method for preparing aluminum hydroxide powder by esterification reaction

A technology of aluminum hydroxide and esterification, applied in the field of chemical production, can solve the problems of inability to achieve horizontal dispersion of molecules, difficult to achieve uniform dispersion of water, etc., and achieve strong promotion and application value, morphology rules, and post-processing processes. simple effect

Active Publication Date: 2015-03-11
TAISHAN MEDICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a method and device for preparing aluminum hydroxide powder by esterification reaction, aiming to solve the disadvantages of the existing method of obtaining aluminum hydroxide through alkoxide hydrolysis. The current preparation method needs to directly add water, even in Under stirring conditions, it is also difficult to achieve uniform dispersion of water, let alone the problem of molecular level dispersion

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  • Method for preparing aluminum hydroxide powder by esterification reaction
  • Method for preparing aluminum hydroxide powder by esterification reaction

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Embodiment 2

[0044]Embodiment 2: At first, 30ml (0.5mol) glacial acetic acid and 45ml isopropanol are joined in the round bottom flask 212, and the theoretical water yield of the esterification reaction of this embodiment is 0.5mol, namely 9 grams, considering the hydrolysis of aluminum alkoxide required theoretical water consumption, and properly leave a margin, so add 0.1 mole of aluminum isopropoxide, the degree of filling in the round bottom flask 212 is controlled at 75%; install the reflux condensation column 211, place the reflux reactor 21 in Heat and reflux in the electric heating mantle 22 for 8 hours; secondly, after the reaction is completed, stop heating, cool to room temperature naturally, pour out the liquid layer on the top of the round bottom flask 212, and keep it as an esterification product; then, remove the white precipitate at the bottom and a small amount of The solution is poured into a centrifuge test tube 24, put into a centrifuge 23, and centrifuged at a speed of ...

Embodiment 3

[0045] Embodiment 3: First, 30ml (0.5mol) glacial acetic acid and 50ml isobutanol are added in the round bottom flask 212, and the theoretical water yield of the esterification reaction of the present embodiment is 0.5mol, namely 9 grams, considering the hydrolysis of aluminum alkoxide required theoretical water consumption, and properly leave a margin, so add 0.1 mole of aluminum isobutoxide, the degree of filling in the round bottom flask 212 is controlled at 80%; install the reflux condensation column 211, place the reflux reactor 21 in Heat and reflux in the electric heating mantle 22 for 6 hours; secondly, after the reaction is completed, stop heating, cool to room temperature naturally, pour out the liquid layer on the top of the round bottom flask 212, and keep it as an esterification product; then, remove the white precipitate at the bottom and a small amount of The solution is poured into a centrifuge test tube 24, put into a centrifuge 23, and centrifuged at a speed o...

Embodiment 4

[0046] Embodiment 4: First, 45ml (0.6mol) of propionic acid and 35ml of absolute ethanol are added in the round bottom flask 212, and the theoretical water yield of the esterification reaction in this embodiment is 0.6mol, i.e. 10.8 grams, taking into account the hydrolysis of aluminum alkoxide required theoretical water consumption, and properly leave a surplus, so add 0.1 mole of aluminum triethoxide, the degree of filling in the round bottom flask 212 is controlled at 80%; install the reflux condensation column 211, place the reflux reactor 21 in the Heat and reflux in the heating mantle 22 for 6 hours; secondly, after the reaction is completed, stop heating, cool to room temperature naturally, pour out the liquid layer on the top of the round bottom flask 212, and keep it as an esterification product; then, remove the white precipitate at the bottom and a small amount of solution , poured into the centrifuge test tube 24, put into the centrifuge 23, centrifuged at a speed o...

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Abstract

The invention belongs to the technical field of chemical industry production and provides a method and a device for preparing an aluminum hydroxide powder by an esterification reaction. The method includes mixing an organic acid and an organic alcohol and adding alcohol aluminum to obtain a mixture, and heating and back flowing the mixture for 3-12 hours; finishing a reaction, naturally cooling the mixture to the room temperature, and pouring out a liquid layer on the upper portion to reserve as an esterification product; and subjecting white precipitation at the bottom and a small amount of solution to a centrifugal separation at a rotating speed of 4000 revolutions per minute, washing by a 95% (v / v) of ethanol and an absolute ethyl alcohol, and drying for 4-8 hours in a vacuum drying box at the temperature between 80 DEG C and 100 DEG C. According to the method, a preparation for an aluminum hydroxide superfine powder can be one-time completed in a liquid phase, alkoxide can be slowly hydrolyzed by water molecules generated by the esterification reaction, an additive is not needed, an aftertreatment process is simple, the appearance of a product is regular, the water molecules generated by the esterification reaction can be consumed by the alkoxide hydrolysis, so that an equilibrium shifting of the esterification reaction is promoted, the extent of the esterification reaction is accelerated, the reaction time is shortened, and the method and the device have high popularization and application values.

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 aluminum hydroxide powder by esterification reaction. Background technique [0002] Aluminum hydroxide (Al(OH) 3 ) is also known as alumina monohydrate, the appearance is white powder, odorless and tasteless, insoluble in water and ethanol, soluble in dilute inorganic acids. Aluminum hydroxide is the largest and most widely used inorganic flame retardant additive. As a flame retardant, aluminum hydroxide can not only be flame retardant, but also prevent smoke, no dripping, and no toxic gas. Therefore, it has been widely used in thermosetting plastics, thermoplastics, synthetic rubber, coatings and building materials. Industry usage is increasing year by year. In the pharmaceutical industry, aluminum hydroxide is used as a raw material for gastrointestinal drugs to suppress gastric acid. It is often used as a compound ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/36
Inventor 吴秀勇
Owner TAISHAN MEDICAL UNIV
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