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Preparation method of ultrafine active aluminium oxide

A technology of activated alumina and carbon dioxide, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of easy blockage and device blockage, and achieves improved absorption rate, high production efficiency, and content of miscellaneous crystals. low effect

Inactive Publication Date: 2006-03-29
XIANGTAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

The main feature of this method is the use of a carbonization reactor, which is a rotating packed bed RPB. The reactant system reacts in the rotating packed bed RPB to form ultrafine particles, causing the device to be blocked quickly.
Therefore, the RPB device still has the defect that it is easy to clog for the system with ultrafine particles.

Method used

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  • Preparation method of ultrafine active aluminium oxide
  • Preparation method of ultrafine active aluminium oxide
  • Preparation method of ultrafine active aluminium oxide

Examples

Experimental program
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Embodiment 1

[0045] Embodiment 1: adopt technological process of the present invention, see figure 1 , extract a certain volume of sodium aluminate solution, filter and remove impurities, and dilute to 0.4mol / L, place it in the circulation tank 13, and the sodium aluminate solution passes through the water pump 12, valve 11, and fluid flow meter 10 from the spiral channel type RBHC reactor 4 The liquid inlet 8 of the rotary bed enters the helical linear channel of the rotor 5 through the distributor 15, see figure 2 , image 3 ; high concentrations of CO 2 After the gas is decompressed from the gas source of the steel cylinder, it passes through the gas valve 1 and the gas flow meter 2 from the inlet 3 and 9 to the spiral linear channel of the rotor 5 of the rotary bed RBHC from the outside of the spiral linear channel, and the gas-liquid volume flow ratio is 3.CO 2 Gas and sodium aluminate solution are reversely contacted in the rotating helical linear channel to carry out carbonizati...

Embodiment 2

[0046] Embodiment 2: This embodiment 2 is except identical with embodiment 1, and its different variation with embodiment 1 is: the concentration of sodium aluminate solution is 0.2mol / L, passes into the CO of high concentration 2 Gas, the rotation speed of rotor 5 is 1000rpm, the carbonization and decomposition are complete, the gel is filtered and washed, then added with deionized water, placed in water at 97°C for heating and aging for 4 hours, after filtering, washing and drying, the properties of the obtained product are shown in Table 1 .

Embodiment 3

[0047] Embodiment 3: This embodiment 3 is except identical with embodiment 1, and its different variation with embodiment 1 is: sodium aluminate solution is 0.5mol / L, feeds the CO of high concentration 2 For gas, the rotating speed of the rotor 5 is 1000rpm, the gas-liquid volume flow ratio is controlled to be 4, the hydrothermal treatment temperature is 97°C, and the aging time is 4h. The properties of the finally obtained fibrous ultrafine aluminum hydroxide are shown in Table 1.

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Abstract

A process for preparing superfine active alumina includes such steps as carbonifying reaction between the solution of sodium metaaluminate (or aluminate) and the gas containing CO2 in gravitation condition to obtain alpha-AlO(OH) gel, filtering, ageing, separating solid, drying and calcining. Said product has high pore volume, large specific surface area and large average pore diameter, and can be used to prepare reforming catalyst and hydrocracking catalyst.

Description

technical field [0001] The invention relates to a method for preparing alumina, in particular to a method for preparing ultrafine activated alumina by using sodium metaaluminate or sodium aluminate solution under high gravity carbonization reaction conditions. Background technique [0002] Activated alumina generally refers to γ-Al 2 o 3 , has a relatively high specific surface area, adsorption performance, surface chemical properties, certain porosity and pore size distribution, and is often used as a catalyst and carrier in oil refining, petrochemical and fertilizer industries. Moreover, the purer and finer the particles, the wider the use and the higher the price. Ultrafine activated alumina often has much higher activity than ordinary alumina. γ-Al 2 o 3 It is usually obtained by dehydrating pseudo-boehmite at high temperature. [0003] At present, domestically, aluminum hydroxide is mainly prepared by the technical route of reprecipitating industrial aluminum hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/04
Inventor 周继承李友凤赵虹谢放华廖立民
Owner XIANGTAN UNIV
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