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Preparation method of pseudo-boehmite

A technology of pseudo-boehmite and sodium aluminate, applied in the field of preparation of pseudo-boehmite, can solve problems such as harsh operating conditions, and achieve the effect of easy operation

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, the operating conditions of this method are too harsh, which brings a lot of inconvenience to the synthesis operation

Method used

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  • Preparation method of pseudo-boehmite

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Effect test

Embodiment 1

[0042] According to the method provided by the invention, pseudo-boehmite is prepared in batch mode.

[0043] Add 2L of deionized water in advance in an 8-liter gelling tank (with a gas distributor at the bottom), the initial temperature is 30°C, and feed carbon dioxide content of 30% by volume and dinitrogen pentoxide through the gas distributor from the bottom of the gelling tank For a mixed gas with a content of 5% by volume and the balance being air, the flow rate of the mixed gas is adjusted to 5.2 meters 3 / hour, when the pH of the deionized water in the tank is lower than 5.0, add a concentration of 100 grams of Al into the tank through flowmeter metering 2 o 3 / liter of sodium aluminate solution, adjust the flow rate of sodium aluminate solution to maintain the pH value of the system at 6.7. At this time, the flow rate of sodium aluminate is 4L / hour, and the gelation reaction stops after 1 hour of reaction. At this time, the slurry temperature is 45 °C. Transfer th...

Embodiment 2

[0045] According to the method provided by the invention, pseudo-boehmite is prepared in batch mode.

[0046] Add 2L of deionized water in advance in an 8-liter gelling tank (with a gas distributor at the bottom), and the initial temperature is 25 ° C. From the bottom of the gelling tank through the gas distributor, add 25% of carbon dioxide and 18% of sulfur dioxide. %, the balance is a mixture of air, adjust the flow rate of the mixture to 3.2 meters 3 / hour, when the pH of the deionized water in the tank is lower than 5.5, add a concentration of 150 grams of Al into the tank by metering the flow meter 2 o 3 / liter of sodium aluminate solution, adjust the flow rate of sodium aluminate solution to maintain the pH value of the system at 6.8, at this time, the flow rate of sodium aluminate is 3.5L / hour, and stop the gelation reaction after 1.5 hours of reaction, at this time, the slurry temperature is 43 °C . Transfer the slurry to an aging reaction kettle, adjust the pH v...

Embodiment 3

[0048] According to the method provided by the invention, pseudo-boehmite is prepared in batch mode.

[0049] Add 2L of deionized water to an 8-liter gelling tank (with a gas distributor at the bottom), and the initial temperature is 35°C. 15 volume%, the balance is air mixture, adjust the flow rate of the mixed gas to 2.1 meters 3 / hour, when the pH of the deionized water in the tank is lower than 3.0, add a concentration of 200 grams of Al into the tank by metering the flow meter 2 o 3 / liter of sodium aluminate solution, adjust the flow rate of sodium aluminate solution to maintain the pH value of the system at 5.2. At this time, the flow rate of sodium aluminate is 2L / hour, and the gelation reaction stops after 1 hour of reaction. At this time, the slurry temperature is 52 ° C. Transfer the slurry to an aging reaction kettle, adjust the pH value of the slurry to 8.6 with 15% (mass) ammonia solution, raise the temperature to 70° C., and age at a constant temperature for...

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Abstract

The invention provides a preparation method of pseudo-boehmite. The preparation method, which comprises a gel formation reaction which is carried out on a sodium aluminate solution and an acidic gas, is characterized in that: the acidic gas is a mixed gas containing CO2 and at least one gas with the pressure of less than 6.38kPa; the gel formation reaction temperature is 10-100DEG C; and the amount of the acidic gas and the ratio of CO2 to the gas with the pressure of less than 6.38kPa in the acidic gas make the pH value of the gel formation reaction be 3-7. Compared with the prior art, the method provided by the invention, which ensures that contents of gibbsite and dawsonite in the obtained pseudo-boehmite are zero or very small, allows the synthetic reaction of pseudo-boehmite to be convenient to operate.

Description

technical field [0001] The invention relates to a preparation method of 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] There are many synthetic methods for pseudo-boehmite as the raw material of alumina carrier, generally including: (1) Alkali precipitation method, that is, neutralization of acidified aluminum salt and alkali. Use alkali to precipitate monohydrate alumina from the acidified aluminum salt solution, and then obtain pseudo-boehmite products through aging, washing, drying and other processes. This method is often called alkali precipitation (acid method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 曾双亲杨清河刘滨聂红李大东
Owner CHINA PETROLEUM & CHEM CORP
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