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A kind of hydrated aluminum oxide and preparation method thereof

A technology of hydrated alumina and pseudo-boehmite, applied in alumina/aluminum hydroxide and other directions, can solve the problems of limited pore expansion, increased production cost, complicated production process, etc., and achieves improved pore structure and better expansion. The effect of hole capacity

Active Publication Date: 2014-10-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the pore-enlarging effect of physical or chemical pore-enlarging agents is limited, the pore structure of the alumina carrier prepared by adding physical or chemical pore-enlarging agents to conventional pseudo-boehmite Still not up to the requirements of hydrocatalytic cracking treatment process for heavy oil with high metal content
Moreover, the addition of physical or chemical pore-enlarging agents in the process of preparing alumina supports from pseudo-boehmite will not only complicate the production process, but also increase production costs.

Method used

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  • A kind of hydrated aluminum oxide and preparation method thereof

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preparation example Construction

[0013] The present invention also provides a method for preparing hydrated alumina, the method comprising contacting and reacting sodium metaaluminate and / or sodium aluminate with an acidic solution, and aging the mixed slurry obtained after the contact reaction in the presence of an aging agent ; The conditions of the contact reaction include: the reaction pH is 4.5-9, and the reaction temperature is 15-75°C; the aging conditions include: the temperature is 20-60°C, and the time is 2-6 hours; the aging agent It is ammonium carbonate and / or ammonium bicarbonate.

[0014] In the preparation method of the hydrated alumina provided by the present invention, by contacting and reacting sodium metaaluminate and / or sodium aluminate with an acidic solution, then the mixed solution obtained after the reaction is mixed with ammonium carbonate and / or ammonium bicarbonate Mixing to carry out aging, and by controlling the conditions of the contact reaction and the adjustment of the aging w...

Embodiment 1

[0023] This example is used to illustrate the hydrated alumina provided by the present invention and its preparation method.

[0024] Weigh 483 grams of aluminum chloride (purchased from Beijing Chemical Factory), add to deionized water and dissolve and make the solution a1 that the concentration is 1 mol / liter; Weigh 210 grams of sodium metaaluminate (purchased from Tianjin, Tianjin) Branch Fine Chemical Research Institute), added to deionized water and dissolved to make a solution b1 with a concentration of 3.0 mol / L; weigh 230 grams of ammonium carbonate (purchased from Beijing Chemical Reagent Co., Ltd.), add it to deionized water and dissolve to prepare A solution c1 with a concentration of 0.5 mol / L was obtained. The solution a1 and the solution b1 were simultaneously added to a 10-liter gel-forming tank for reaction in a parallel manner, and the pH value in the gel-forming tank was maintained at 8.5 by controlling the inflow speed of the solution a1 and the solution b1....

Embodiment 2

[0028] This example is used to illustrate the hydrated alumina provided by the present invention and its preparation method.

[0029]Weigh 666 grams of aluminum sulfate (purchased from Beijing Chemical Factory), add it to deionized water and dissolve and make a solution a2 with a concentration of 0.5 mol / liter; Weigh 210 grams of sodium metaaluminate (purchased from Tianjin Jinke) Institute of Fine Chemicals), add it to deionized water and dissolve it to make a solution b2 with a concentration of 2.0 mol / L; weigh 370 grams of ammonium bicarbonate (purchased from Beijing Chemical Reagent Company), add it to deionized water and dissolve it to make a solution b2. A solution c2 with a concentration of 1.0 mol / L was obtained. The solution a2 and the solution b2 were simultaneously added to a 10-liter gel-forming tank in a parallel manner for reaction, and the pH value in the gel-forming tank was maintained at 6.0 by controlling the inflow speed of the solution a2 and the solution b...

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Abstract

The present invention provides a hydrated alumina containing pseudo-boehmite, wherein the hydrated alumina further contains basic aluminum ammonium carbonate. The present invention also provides a method for preparing hydrated alumina, the method comprising contacting sodium metaaluminate and / or sodium aluminate with an acidic solution, and aging the mixed slurry obtained after the contact reaction in the presence of an aging agent The conditions of the contact reaction include: the reaction pH value is 4.5-9, and the reaction temperature is 15-75°C; the aging conditions include: the temperature is 20-60°C, and the time is 2-6 hours; the aging agent Ammonium carbonate and / or ammonium bicarbonate. The alumina support prepared by using the hydrated alumina prepared by the method for preparing hydrated alumina according to the present invention has significantly improved most probable pore diameter, average pore diameter, pore volume and pore volume with a diameter of 10-60 nanometers.

Description

technical field [0001] The present invention relates to a hydrated alumina and a preparation method of the hydrated alumina. Background technique [0002] Pseudo-boehmite, as the precursor of alumina, is calcined at a certain temperature to generate activated alumina. Activated alumina has good thermal stability, certain activity, suitable pore structure, suitable specific surface area, high mechanical strength and other excellent properties, and has become the carrier of various catalysts in the petrochemical industry, especially hydrogenation catalysts Carrier. [0003] Heavy oil hydrogenation technology is an effective way for oil refining enterprises to improve economic efficiency and realize efficient and clean utilization of energy, which has attracted widespread attention. Heavy oil, especially inferior residue oil with high metal content, has the characteristics of large molecules and more impurities. The carrier material used in heavy oil hydrogenation catalysts r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 刘滨杨清河曾双亲胡大为聂红
Owner CHINA PETROLEUM & CHEM CORP
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