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Method for preparing hydrated alumina

A technology of hydrated alumina and acid aluminum, applied in the preparation of aluminum hydroxide, alkali metal aluminate/alumina/aluminum hydroxide and other directions

Active Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only controls the hard agglomeration of particles during the drying process, and does not control the boehmite gel preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1L sodium metaaluminate aqueous solution (Al 2 o 3 Concentration is 15g / 100ml) and 1.5L aluminum sulfate aqueous solution (Al 2 o 3 The concentration is 4g / 100ml) into the container at the high position, and the flowmeter connected to the bottom flows into the stainless steel container with agitator equipped with 6L clean water. kHZ, heated to 70°C; while stirring, add aluminum sulfate solution to reduce the pH value of the slurry to 3.5, and after 5 minutes of stabilization, add the two materials into the stainless steel tank at a certain speed at the same time, keep the pH at 7.2, and neutralize 15 minutes. After neutralizing for a period of time, stop adding the aluminum sulfate solution to raise the pH value to 9, stop adding the sodium metaaluminate solution, turn off the ultrasonic cleaner, turn on the agitator, and stabilize for a period of time; pass through the aluminum sulfate solution to lower the pH value To 3, stable for a period of time; through the so...

Embodiment 2

[0041] Compared with Example 1, control the ultrasonic frequency to 40 kHz and heat to 60 ° C; under the condition of stirring, add aluminum sulfate solution to reduce the pH value of the slurry to 3, and after stabilizing for 8 minutes, mix the two materials at a certain speed At the same time, add it to the stainless steel tank, keep the pH at 7, and neutralize for 20 minutes. Other material consumption and operating conditions are identical with embodiment 1, obtain sample 2.

Embodiment 3

[0043] Compared with Example 1, control the ultrasonic frequency to 20 kHz and heat to 80°C; under the condition of stirring, add aluminum sulfate solution to reduce the pH value of the slurry to 4, and after 3 minutes of stabilization, mix the two materials at a certain speed At the same time, add it to the stainless steel tank, keep the pH at 6.5, and neutralize for 30 minutes. Other material consumption and operating conditions are identical with embodiment 1, obtain sample 3.

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Abstract

The invention discloses a method for preparing hydrated alumina. The method comprises the following process that: (1) bottom water is added into a neutralization reactor and is heated to 50-95 DEG C, an acid aluminium salt water solution is added at the same time so as to control the pH value between 2 and 4, and the pH value is stabilized for a while; (2) the acid aluminium salt water solution and alkali metal aluminate (or alkaline precipitator) solution to regulate the pH value between 6 and 8, and the pH value is stabilized for a while; the alkaline precipitator solution (or the alkaline precipitator solution) is added to regulate the pH value to be between 8.5 and 12, and the pH value is stabilized for a while; (4) the acid aluminium salt water solution is added to regulate the pH value to be between 2 and 4, and the pH value is stabilized for a while; (5) the alkaline precipitator solution or the alkaline precipitator solution is added to regulate the pH value to be between 8.5 and 12, and the pH value is stabilized for a while; the steps (4) and (5) are repeated for 1-4 times; (7) after gelatinizing is completed, aging, filtering, washing and drying are carried out to obtain the hydrated alumina; and the steps (1)-(3) are carried out under the action of ultrasonic waves, and the frequencies of the ultrasonic waves are10-80 kHZ. The hydrated alumina which is prepared through the method is distributed in a centralized manner and has high crystallinity and large pore volumes and pore diameters.

Description

technical field [0001] The invention relates to a preparation method of hydrated alumina, in particular to a preparation method of hydrated alumina with large pore volume and diameter, high crystallinity and concentrated pore distribution. Background technique [0002] Hydrated alumina such as boehmite and pseudo-boehmite are widely used as raw materials for preparing alumina carriers. Although methods such as hydrothermal treatment and adding pore-enlarging agents can be used to improve the properties of the alumina support during the preparation of the alumina support, there is a limit to improving the performance of the alumina support by these methods. The properties of the hydrated alumina raw material used in the alumina carrier is one of the most critical factors for producing a suitable alumina carrier. A variety of hydrated alumina raw materials with different properties can be used to prepare catalyst supports for different reactions. For example, the hydrated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14C01F7/34
Inventor 隋宝宽王刚刘文杰吴国林安晟
Owner CHINA PETROLEUM & CHEM CORP
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