Pseudo-boehmite, preparation method thereof, and alumina prepared from the pseudo-boehmite

A technology of pseudo-boehmite and hydrated alumina, which is applied in the field of alumina, can solve the problems of catalyst hydrodesulfurization performance deviation, etc., and achieve the effect of excellent hydrodesulfurization performance

Active Publication Date: 2011-12-21
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0018] Although the above-mentioned documents disclose a variety of different methods for preparing pseudo-boehmite, and the performance of the obtained pseudo-boehmite is excellent in some respects, yet, when the alumina produced by them is used as a catalyst carrier, The hydrodesulfurization performance of the catalyst is not uniform and needs to be further improved

Method used

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  • Pseudo-boehmite, preparation method thereof, and alumina prepared from the pseudo-boehmite

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preparation example Construction

[0029] According to the preparation method of pseudo-boehmite provided by the present invention, although any one of the processes in the hydrolysis reaction or precipitation reaction and aging can be carried out in the presence of a grain growth regulator, the purpose of the present invention can be achieved, but preferably In this case, the hydrolysis reaction and aging process or the precipitation reaction and aging process are all carried out in the presence of a grain growth regulator, so that n of the obtained pseudo-boehmite can be preferably in the range of 1.2≤n≤2.2.

[0030] The present invention has no special limitation on the amount of the grain growth regulator, preferably the amount of the grain growth regulator in the hydrolysis reaction is 0.5-10% by weight of the weight of the organic aluminum-containing compound to be hydrolyzed, more preferably 1-8.5% by weight , more preferably 5-8.5% by weight; the amount of the grain growth regulator in the precipitation ...

Embodiment 1

[0056] This example is used to illustrate that the present invention provides pseudo-boehmite and its preparation method.

[0057] In a 2-liter reaction tank, add 600 milliliters of concentration and be 96 grams of alumina / liter, aluminum sulfate solution containing 3.6 grams of ribitol and ammonia solution of 8% by weight to carry out precipitation reaction in parallel, and the reaction temperature is 40 ℃ , the reaction time is 10 minutes, the flow rate of the ammonia solution is controlled so that the pH of the reaction system is 7, after the precipitation reaction is completed, an appropriate amount of ammonia water is added to the slurry to make the pH of the slurry 8.5, and the slurry is aged at 55°C for 60 minutes and then filtered. The filter cake was beaten and washed twice with deionized water, and dried at 120°C for 24 hours to obtain hydrated alumina P1, which was characterized by XRD and P1 had a pseudo-boehmite structure.

[0058] XRD was measured on a SIMENS D50...

Embodiment 2

[0062] This example is used to illustrate that the present invention provides pseudo-boehmite and its preparation method.

[0063] High-concentration NaAlO containing 210 grams of alumina / liter and a caustic coefficient of 1.62 2 solution with deionized water to prepare Al 2 o 3 Concentration is 5 liters of solution of 40 grams / liter, then adds 16.3 grams of sodium gluconate to obtain NaAlO containing sodium gluconate 2 solution, and then transferred to a gelling reactor with a total volume of 8L, the ratio of height to diameter of the reactor is 8, and the lower part is equipped with CO 2 gas distributor. Control the temperature of the solution at 25±5°C, and feed CO with a concentration of 90% by volume from the bottom of the reactor 2 The gas carries out the gelation reaction, the gelation temperature is controlled at 20-40°C, and the CO 2 The gas flow rate is 15±2 liters / minute, and the pH value at the end of the reaction reaches 8.0-8.5 within 4-6 minutes, that is, t...

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Abstract

A pseudo-boehmite and its preparation method and alumina prepared from the pseudo-boehmite, wherein, the n of the pseudo-boehmite satisfies 1.1≤n≤2.5, wherein n=D(031) / D (120), said D (031) represents the grain size of the crystal plane represented by the 031 peak in the XRD spectrum of the pseudo-boehmite grain, and D (120) represents the XRD of the pseudo-boehmite grain The grain size of the crystal face represented by the 120 peak in the spectrogram, the 031 peak refers to the peak with 2θ in the XRD spectrum of 34-43 °, and the 120 peak refers to the 2θ in the XRD spectrum of 23-33 ° D=Kλ / (Bcosθ), K is the Scherrer constant, λ is the diffraction wavelength of the target material, B is the half-width of the diffraction peak, and 2θ is the position of the diffraction peak. The calcined alumina of the pseudo-boehmite provided by the invention is more suitable for use as a catalyst carrier, and the obtained catalyst has better hydrodesulfurization performance.

Description

technical field [0001] The present invention relates to a hydrated alumina and a preparation method thereof, more specifically to a pseudo-boehmite, a preparation method thereof and alumina prepared from the pseudo-boehmite. Background technique [0002] Alumina, especially γ-alumina, is often used as a carrier for the preparation of catalysts because of its good pore structure, specific surface area and thermal stability. The precursor of alumina is hydrated alumina, such as pseudoboehmite, whose particle size, morphology, crystallinity, etc. affect the properties of the alumina carrier such as pore volume, pore distribution, and specific surface area. [0003] Pseudo-boehmite as an alumina carrier raw material is generally prepared by the following methods: (1) Alkali precipitation method, that is, acidified aluminum salt is neutralized with alkali. Use alkali to precipitate monohydrate alumina from the acidified aluminum salt solution, and then obtain pseudo-boehmite pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 曾双亲杨清河刘滨胡大为刘学芬李洪宝聂红李大东
Owner CHINA PETROLEUM & CHEM CORP
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