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Production method of alumina carrier

A technology of alumina carrier and production method, applied in the direction of alumina/aluminum hydroxide, etc., to achieve the effects of preventing structure collapse, effectively relaxing hole expansion, increasing proportion, specific surface area and mechanical strength

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of pore-enlarging agent can effectively increase the macropore content of the carrier, but it cannot simultaneously meet the requirements of the carrier with a high specific surface area and high mechanical strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Step 1 Prepare an appropriate amount of aluminum sulfate solution with a mass concentration of 15% and a sodium hydroxide aqueous solution with a mass concentration of 30%; Step 2 controls the flow rate of the aluminum salt to 40ml / min and the flow rate of the precipitation agent to 60ml / min. Conditions flowed into the reactor in parallel flow, so that the pH of the final solution was 9, and the temperature was kept at 65°C during the precipitation process; step 3, filter the obtained precipitate, and wash it with deionized water repeatedly for 4-5 times until the Na ion content in the hydrated alumina 4 2+ Ion content is less than 1.2m%; Step 4 Weigh an appropriate amount of the above filter cake and add an appropriate amount of ammonium nitrate aqueous solution with a mass concentration of 10%. The volume ratio of the ammonium salt aqueous solution to the filter cake is 2:1, and the mixture is placed in an ultrasonic field In step 5, filter the materials in step 4 and d...

example 2

[0026] Same as Example 1, except that the ammonium salt in step 4 is an ammonium nitrate solution with a mass concentration of 30%, and the ultrasonic immersion is performed for 3 hours under the condition of an ultrasonic frequency of 50 kHz. The specific surface of the prepared alumina carrier is 243m 2 / g, 10-20nm pores account for 75% of the total pore volume, and the carrier strength is 98N / cm.

example 3

[0028] The same as Example 1, except that the ammonium salt in step 4 is an ammonium acetate solution with a mass concentration of 50%, and the ultrasonic immersion is carried out for 1 hour under the condition of an ultrasonic frequency of 80 kHz. The specific surface of the prepared alumina carrier is 256m 2 / g, 10-20nm pores account for 79% of the total pore volume, and the carrier strength is 112N / cm.

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PUM

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Abstract

The invention discloses a production method of an alumina carrier. The method comprises the following processes: (1) conducting excess volume impregnation of pseudo-boehmite by aqueous solution of ammonium salt; (2) filtering and drying the pseudo-boehmite impregnated with aqueous solution of ammonium salt in the step (1); and (3) using the pseudo-boehmite obtained in the step (2) as a raw material and forming, drying and roasting the raw material to obtain the alumina carrier. The alumina carrier produced by the method has the advantages of concentrated pore distribution, high specific surface area and high mechanical strength.

Description

Technical field [0001] The invention relates to a method for producing an alumina carrier, in particular to a method for producing an alumina carrier with concentrated pore distribution, high specific surface and high strength. Background technique [0002] As we all know, the properties of alumina support such as pore distribution, specific surface area, mechanical strength, etc. play an important role in the activity and stability of the catalyst with alumina as the support. For heavy distillate hydrotreating catalysts, because heavy distillates have high metal impurities and are easy to deposit, if the pore size of the catalyst carrier is small, the deposits will block the pores of the catalyst, resulting in a rapid decrease in catalyst activity or even deactivation. Affect industrial applications. The heavy distillate hydrotreating catalyst generally requires the pore distribution of the alumina support to be concentrated between 10nm-20nm, and at the same time have a high s...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 季洪海沈智奇凌凤香王少军杨卫亚王丽华郭长友
Owner CHINA PETROLEUM & CHEM CORP
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