Process for preparing active aluminium oxide

A technology of activated alumina and aluminum trichloride, which is applied in the field of activated alumina, can solve problems such as uneven solid particle size, large volume of neutralization reactor, and dispersed pore distribution, so as to be beneficial to environmental protection and shorten the production cycle , the effect of concentrated hole distribution

Inactive Publication Date: 2003-06-25
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above preparation of γ-Al 2 o 3 There are following three disadvantages in the conventional method: first, there are many preparation steps, which usually include: acid-base neutralization (precipitation)-aging-filtering-washing-drying-crushing-molding-roasting
Second, the filtrate and washing filtrate contain a large amount of soluble ions. If this type of liquid is discharged directly, it will pollute the en

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take crystalline aluminum chloride (containing AlCl 3 97%) 63.53g and deionized water to form a concentration of 1.0molAlCl 3 · L -1 250ml of the solution, weighed 0.1mol of ammonium oxalate, added to the aluminum chloride solution. Heating the solution under constant stirring, and keeping the temperature constant at 60°C, dropwise added 2mol NH to the solution with a dropper. 3 · L -1 150g of aqueous ammonia, the pH value of the solution system is 3.8, the above solution is evaporated at 70°C to gradually precipitate a white solid, dried at 90°C for 8 hours, decomposed at 350°C for 4 hours, then pressed into tablets, and calcined at 550°C for 3 hours hour, that is, γ-Al 2 o 3 , and its main properties are listed in Table 1.

[0018]

Embodiment 2～3

[0020] The preparation method is similar to that of Example 1, the difference being that the amount of the pore expander ammonium oxalate was changed to 0.15 mol and 0.20 mol, and the obtained results are listed in Table 1.

Embodiment 4～6

[0022] The decomposition temperatures are 200°C, 250°C, and 300°C, and the corresponding decomposition times are 6.0 hours, 5.0 hours, and 4.5 hours, respectively. The rest are the same as in Example 1. The main properties of the product are listed in Table 2

[0023]

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PUM

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Abstract

The present invention relates to the preparation process of active gamma-Al2O3. The mixed water solution of materials including aluminum chloride, ammonia water, pore expander ammonium oxalate or ammonium citrate, etc. is heated and concentrated to produce aluminum hydroxide precipitate; the precipitate is dried and heated to obtain solid powder and to decompose its NH4Cl, which is recovered from hot gas flow through cooling and crystallization; and the solid powder is roasted at 400-800 deg.c for 3-6 hr to convert into gamma-Al2O3. The present invention produces aluminum hydroxide through evaporation and concentration, rather than neutralization, and aluminium hydroxide is precipitated and separated in a stable and balanced solid-liquid state, and this is favorable to producing aluminium hydroxide grains with homogeneous size.

Description

(1) Technical field [0001] The present invention relates to a kind of activated alumina, especially γ-Al 2 o 3 method of preparation. (2) Background technology [0002] γ-Al 2 o 3 It is the most widely used industrial catalyst carrier. The preparation method usually adopts acid-base neutralization to generate solid precipitation. There are three main types: the first is the acid method, that is, the neutralization reaction of aluminum salt and alkali. The raw materials used include aluminum trichloride and ammonia water, etc. Patent ZL94107295 .9 A method for preparing a hydrogenation catalyst carrier disclosed, which uses an acidic aqueous solution containing aluminum ions and an alkaline aqueous solution containing or not containing aluminum ions for neutralization to prepare activated alumina, and the method used is the acid method. The second is the alkaline method, that is, the neutralization reaction of aluminate and acid. The aluminates used are mainly sodium met...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/34
Inventor 方维平王跃敏盛景云
Owner XIAMEN UNIV
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