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Preparation method for alumina oxide carrier

A technology of alumina carrier and pore volume, which is applied in the field of preparation of distillate oil hydrotreating catalyst carrier, can solve the problems of increased vibration, large changes in alumina grain size, and large fluctuations in gelling temperature, etc., and achieves vibration amplitude The effect of increasing, simple preparation process, and uniform particle size

Active Publication Date: 2014-04-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses ultrasonic treatment during the gelling process, and the formed aluminum hydroxide particles intensify the vibration under the action of ultrasonic waves, and the heat generated thereby cannot be quickly removed from the slurry system, resulting in large fluctuations in the gelling temperature, resulting in The particle size of alumina grains varies greatly, so the pore distribution range is relatively wide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] In the preparation process of the alumina carrier of the present invention, in the acidic aluminum salt aqueous solution, Al 2 O 3 The concentration is 2~10g / 100ml; in the alkaline aluminate aqueous solution, Al 2 O 3 The concentration is 8-30g / 100ml.

[0026] In the present invention, the specific surface area and pore structure are tested by the cryogenic liquid nitrogen adsorption method.

Embodiment 1

[0029] Add 2L sodium metaaluminate aqueous solution (Al 2 O 3 The concentration is 15g / 100mL) and 3L aqueous solution of aluminum sulfate (Al 2 O 3 Concentration of 2g / 100mL) were put into the container at the high position, the flow meter connected to the bottom flowed into a stainless steel container equipped with 6L water purification with agitator and heating jacket, heated to 50 ℃; co-current continuous adding aluminum sulfate solution and partial Sodium aluminate solution, make the pH value rise to 8.5 and stabilize for 50 minutes; after the co-current flow is over, put it into an ultrasonic reactor, the ultrasonic frequency is 240kHZ, the ultrasonic power is 0.13W / ml, after treatment for 2.0 hours, the mother liquor is separated by filtration ,washing. It was dried at 100°C for 3 hours, molded, and then heated to 500°C at a rate of 180°C / hour, and kept at a constant temperature for 3 hours to obtain sample A. The physical properties of the sample are shown in Table 1.

Embodiment 2

[0031] Add 2L sodium metaaluminate aqueous solution (Al 2 O 3 The concentration is 15g / 100mL) and 3L aqueous solution of aluminum sulfate (Al 2 O 3 Concentration is 2g / 100mL) respectively into the container at the high position, the flow meter connected to the bottom flows into a stainless steel container equipped with 6L water purification with agitator and heating jacket, heated to 40 ℃; co-currently add aluminum sulfate solution and partial Sodium aluminate solution, make the pH value rise to 8.0 and stabilize for 60 minutes; after the co-current flow is over, put it into an ultrasonic reactor, the ultrasonic frequency is 270kHZ, the ultrasonic power is 0.20W / ml, after processing for 4 hours, the mother liquor is separated by filtration ,washing. It was dried at 120°C for 3 hours, molded, and then heated to 480°C at a rate of 180°C / hour and kept at a constant temperature for 4 hours to obtain sample B. The physical property data of the sample B is shown in Table 1.

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PUM

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Abstract

The present invention discloses a preparation method for an alumina carrier. The method comprises: concurrently and continuously adding an acidic aluminum salt aqueous solution and an alkaline aluminate solution; stabilizing; adding the resulting mixed solution to an ultrasonic reactor to carry out a treatment; carrying out filtering, washing and drying to obtain an alumina dry gel; and carrying out molding, drying and calcination to obtain the alumina carrier. According to the method of the present invention, the acidic aluminum salt and the alkaline aluminate are selected, co-current neutralization gel forming is adopted, and a suitable ultrasonic treatment is performed, such that molecule resonance can be generated when the frequency is close to the natural frequency of the aluminum hydroxide particles, the amplitude of molecule vibration is greatly increased, agglomeration of the aluminum hydroxide particles in a growth process due to slow mechanical stirring is avoided, heat generated by mutual vibration of the aluminum hydroxide particles is more uniform than external heating so as to easily achieve a uniform particle size of the particles, and pore distribution of the resulting alumina carrier is centralized in 6-10 nm. In addition, the alumina carrier prepared by the method of the present invention can be used for preparation of distillate oil hydrotreating catalysts.

Description

Technical field [0001] The invention relates to a preparation method of an alumina carrier, in particular to a preparation method of a distillate hydrorefining catalyst carrier. Background technique [0002] The distillate hydrorefining catalyst is generally composed of a metal or metal oxide with a hydrogenation function and a carrier with a certain acid function. Commonly used metal components are cobalt-molybdenum, nickel-molybdenum or nickel-tungsten, and the support is generally alumina. In order to make the alumina carrier better suitable for the distillate hydrorefining reaction, the alumina carrier needs to be modified to adjust the properties of the carrier, especially the pore distribution of the carrier is required to be relatively concentrated. [0003] CN97112397.7 relates to a distillate oil hydrorefining catalyst, which is composed of 1 to 5 wt% nickel oxide, 12 to 35 wt% tungsten oxide, and the rest is alumina, which is composed of one or more small pore alumina I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/04B01J35/10C01F7/14
Inventor 隋宝宽王刚刘文杰吴国林安晟
Owner CHINA PETROLEUM & CHEM CORP