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Aluminum hydroxide and preparation method thereof

An aluminum hydroxide and oxide technology, applied in chemical instruments and methods, catalyst carriers, chemical/physical processes, etc., can solve the problems of dispersion of pore size distribution, large bubble size, clogging of distribution plate products, etc., and achieve concentrated pore distribution. , the effect of large specific surface area and fast circulation speed

Active Publication Date: 2013-05-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two reactors avoid the disadvantages of high energy consumption, uneven gas distribution, and low utilization rate of traditional mechanically stirred reactors to a certain extent, but have the following disadvantages: (1) The gas distribution tube and distribution plate are easily formed (2) After gas distribution, the bubble size is still large, and the gas utilization rate needs to be further improved; (3) The prepared aluminum hydroxide grain size is not uniform, and the pore size distribution is dispersed

Method used

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  • Aluminum hydroxide and preparation method thereof
  • Aluminum hydroxide and preparation method thereof

Examples

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Effect test

Embodiment 1

[0033] Take industrial-grade aluminum hydroxide powder and industrial-grade sodium hydroxide to configure a concentration of 365 gAl 2 o 3 / L concentrated sodium metaaluminate solution, then diluted to a concentration of 28gAl 2 o 3 / L of sodium metaaluminate solution, add organic pore expander alkylphenol and ethylene oxide condensation product (OP-10) and polyoxyethylene sorbitan monooleate (T-80), where OP- The weight ratio of 10 to T-80 is 60:40, the amount of pore expander accounts for 0.6% of the weight of sodium metaaluminate, diesel oil is used as the defoamer, and the amount of defoamer is 0.6% of the weight of the pore expander. The solution is added to the jet loop reactor, the mixed gas of carbon dioxide and air is injected into the reactor, CO 2 The volume concentration is 60%, and the average gas holdup rate is controlled to 0.20, so that the fluid is uniformly mixed in the reactor and forms a circulation flow. When the gel stops. The slurry was washed with d...

Embodiment 2

[0035] The preparation method of aluminum hydroxide is identical with embodiment 1, and its difference is to control air and CO 2 The gas holdup of the mixed gas is 0.15, and the circulation velocity is 1.80 m / s. The physical and chemical properties of the obtained alumina A-2 are shown in Table 1.

Embodiment 3

[0037] The preparation method of aluminum hydroxide is identical with embodiment 1, and its difference is to control air and CO 2 The gas holdup of the mixed gas is 0.18, and the circulation velocity is 1.90 m / s. The physical and chemical properties of the obtained alumina A-3 are shown in Table 1.

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Abstract

The invention discloses an aluminum hydroxide method and a preparation method thereof. The aluminum hydroxide is prepared by a carbonation method in a loop reactor. The method specifically comprises steps of: adding a small amount of an organic pore-expanding agent and a defoaming agent into a sodium metaaluminate solution; placing the solution in the loop reactor; and then injecting a mixed gas of air and / or inert gas and CO2; thoroughly mixing the fluid by using directed regulatory circulation flow of the fluid in the loop reactor, so as to gelatinize at one time and generate pseudo-boehmite with uniform grains; and roasting the pseudo-boehmite to obtain alumina with large pore volume, large pore diameter and concentrated pore distribution. The aluminum hydroxide can be used as a carrier component of an adsorbent or a catalyst, and preferably as a carrier component for a heavy oil hydrogenation demetalation catalyst.

Description

technical field [0001] The invention relates to aluminum hydroxide and a preparation method thereof, in particular to aluminum hydroxide with large pore volume and large pore diameter suitable for use as a hydrodemetallization catalyst carrier component and a preparation method thereof. Background technique [0002] There are many types of alumina, such as γ-, η-, θ-, δ-, and α-Al 2 o 3 etc., where γ- and η-Al 2 o 3 For the commonly used activated alumina. They are all defective spinel structures, and because of their excellent surface properties, such as large surface area, strong surface adsorption performance, surface acid centers, and porous and macroscopic structures, they are widely used as catalysts, carriers, and dry adsorbents. In petrochemical industry, organic chemical industry, rubber industry, chemical fertilizer industry and environmental protection industry, especially γ-Al 2 o 3 Due to its large specific surface area, adjustable pore structure and good ...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J35/10B01J21/04
Inventor 付秋红朱慧红王永林高鹏张艳侠段日
Owner CHINA PETROLEUM & CHEM CORP
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