Preparation method for alumina carrier

A technology of alumina carrier and acidic aluminum, which is applied in the direction of catalyst carrier, chemical instruments and methods, alumina/aluminum hydroxide, etc. It can solve the problems of specific surface area reduction, temperature increase, secondary particle size increase, etc. , to achieve the effect of high specific surface area and simple process

Active Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the temperature rises, it can promote the excessive aggregation of the secondary particles, resulti

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0026] According to the preparation method of the alumina carrier provided by the present invention, the specific preparation process may include the following steps:

[0027] 1) prepare acidic aluminum salt solution, its concentration is Al 2 o 3 It is calculated as 2-10g / 100mL; if necessary, silicate, borate or phosphate solution can also be added to the prepared acidic aluminum salt solution; to prepare an alkaline aluminum salt solution, use Al 2 o 3 The concentration is 8~30g / 100mL, or prepare dilute ammonia solution, NH 3 The content is 8~16g / 100mL;

[0028] 2) Add neutralization bottom water into the neutralization tank, and heat up to the required temperature under stirring;

[0029] 3) Add a certain amount of acidic aluminum salt solution to the neutralized bottom water to lower the pH value to 2.0-4.0, preferably 3-4, most suitable 3.0-3.5, and the solution temperature is 50-95°C, preferably 55-75°C, the most suitable is 60-70°C; stop adding the acidic aluminum ...

Embodiment 1

[0046] 2L sodium metaaluminate aqueous solution (Al 2 o 3 Concentration is 15g / 100mL,) and 3L aqueous solution of aluminum sulfate (Al 2 o 3 The concentration is 4g / 100mL) into the container at the high position respectively, and the flowmeter connected to the bottom flows into the stainless steel container with stirrer and heating jacket equipped with 6L of clean water, and is heated to 70°C. While stirring, add aluminum sulfate solution to reduce the pH value of the slurry to 3.5. 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 for 15 minutes. After a period of neutralization, stop adding the acidic aluminum salt solution to increase the pH value to 9, stop adding the alkaline aluminum salt (or alkaline precipitating agent) solution, and stabilize for a period of time; feed the acidic solution to reduce the pH value to 3, Stable for a period of time; through alkal...

Embodiment 2

[0048] Compared with Example 1, the stabilizing agent was changed to PEG1000 (polyethylene glycol 1000), and the amount of other materials and the preparation conditions were the same as in Example 1 to obtain Sample 4.

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Abstract

The invention relates to a preparation method for an alumina carrier. The method comprises the following steps of: performing merging, oscillation and neutralization process on an acidic aluminum salt solution and alkali aluminum salt (or alkali precipitating agent), adding a stabilizing agent in an amount which is 0.1 to 3 percent of Al2O3 dry colloid in the ageing process, filtering, washing, forming, drying and roasting, and thus obtaining the alumina carrier. According to the process, the required alumina particle diameter is prepared by merging and oscillation, and then the stabilizing agent is added in the ageing process, so that the stability of colloidal particles can be improved, the particle aggregation degree of the ageing process is reduced, the crystallization degree of the colloidal particles is increased, amorphous alumina is reduced, the particle diameter of the alumina crystal is relatively uniform, the aperture is more centralized, and the specific surface area is enlarged. The method is simple in process; and the prepared alumina carrier with large aperture and high specific surface area can be used as a hydro-treating catalyst carrier, and is particularly suitable to be used as a carrier of a residuum hydro-treating catalyst.

Description

technical field [0001] The invention relates to a method for preparing an alumina carrier or an alumina carrier containing a small amount of silicon oxide (boron trioxide or phosphorus pentoxide). Background technique [0002] Catalyst support properties such as surface area and pore size play an important role in the stability of catalyst activity. For heavy distillate oil, especially residual oil, the content of metal impurities (such as Ni, V, etc.) is high. If the pore size of the catalyst carrier is small (less than 15nm), the pore size of the catalyst will be small, resulting in the deposition of metal impurities in the heavy distillate oil, especially the residue, near the catalyst orifice, blocking the catalyst orifice, and reducing the catalyst activity and stability. reduce. If the average pore diameter of the catalyst support is too large, the specific surface area of ​​the support will decrease, resulting in a decrease in desulfurization activity, low strength ...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04B01J21/12B01J27/02B01J27/18C10G45/04C01F7/02
Inventor 隋宝宽王刚袁胜华刘喜来刘文洁
Owner CHINA PETROLEUM & CHEM CORP
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