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Nano alumina and its preparation method

A technology of nano-alumina and nano-alumina hydroxide, which is applied in the field of preparation of nano-γ-alumina, can solve the problems of high raw material price, large particle size and unevenness of alumina, and achieve low cost, small dosage, and avoid particle size. The effect of diameter increase

Active Publication Date: 2006-11-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN1122772A discloses the method for preparing fine-grained alumina with aluminum alkoxide sol-gel method, the shortcoming of this method is that the price of raw mate

Method used

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  • Nano alumina and its preparation method

Examples

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Example Embodiment

[0047] Example 1

[0048] Mix 50g minus three-line dewaxing oil and 10g SP-80, heat at 80°C to dissolve, and mix uniformly; heat 700g nonahydrate aluminum nitrate to 80°C to melt, slowly add to the above mixture, and mix for 20 minutes to form a uniform super solubilized body. 240 g of saturated ammonia water at 20°C was added dropwise, and aged for 3 hours to obtain nano-aluminum hydroxide gel. The aluminum hydroxide gel was calcined at 550°C for 8 hours to obtain the nano γ-alumina in this embodiment.

Example Embodiment

[0049] Example 2

[0050] Mix 10g minus fourth-line oil, 20g minus first-line oil, 2g minus second-line wax paste, 13g residual oil wax paste, 8g SP-80, 2g OP-4 and 2g M-201, heat at 100°C to dissolve and mix well; mix 820g nine The hydrated aluminum nitrate is heated to 100° C. to melt, slowly added to the above mixture, and mixed for 30 minutes to form a uniform super solubilizing body. In a closed reactor, 123 g of liquid ammonia at 50°C was added to the super sol-enhancing body, and reacted at 180°C for 2 hours to obtain nano aluminum hydroxide gel. The aluminum hydroxide gel is calcined at 600° C. for 8 hours, that is, the nano γ-alumina in this embodiment.

Example Embodiment

[0051] Example 3

[0052] Dissolve and mix 57g of normal three-line oil, 3g of fatty acid monoglyceride, 10g of polyisobutenyl diethylene glycol maleate and 1g of tall oil amide at 100℃; mix and heat 613g of aluminum chloride, 367g of urea and 355g of water Melt at 120°C, slowly add to the above mixture, mix for 20 minutes to form a uniform super solubilizer. The reactor was closed, reacted at 200°C for 4 hours, and aged for 10 hours to obtain nano aluminum hydroxide gel. The aluminum hydroxide gel is calcined at 650° C. for 4 hours, which is the nano γ-alumina in this embodiment.

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Abstract

This invention discloses a method for producing nanometer alminum dioxide. The procedures comprise: solubilise the melting inorganic aluminium salt in the mixture of hydrocarbon component and surfactantto form the molten salt-in-oil super solubilising colloidal group, which limits the aluminum hydroxide generated by the reaction of molten salt and precipitant in the colloidal group, so as to avoid the increase of aluminum oxide particle size and narrow the particle size distribution range. This invention is characterized of high yield and purity, with low cost of surfactant and hydrocarbon component. Besides, the process is simple and is adapted for industrial mass production.

Description

technical field [0001] The invention relates to a nano-alumina and a preparation method thereof, in particular to a preparation method of monodisperse nano-γ-alumina. Background technique [0002] Nano-alumina is a kind of ultrafine particles with a particle size of 1-100nm. It has strong volume effect, quantum size effect, surface effect and macroscopic quantum tunnel effect. Series of excellent performance, widely used in fine ceramics, composite materials, fluorescent materials, moisture-sensitive sensors, infrared absorption materials and catalytic materials. γ-alumina is widely used as a support material for catalysts. When γ-alumina is prepared into nanoparticles, the properties of the catalyst will change greatly. [0003] At present, the preparation methods of nano-alumina can be classified into solid-phase method, gas-phase method and liquid-phase method. Liquid phase methods include precipitation method, sol-gel method and phase transfer method. CN1122772A disc...

Claims

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Application Information

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IPC IPC(8): C01F7/30
Inventor 王鼎聪孙万付
Owner CHINA PETROLEUM & CHEM CORP
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