Preparation method of alumina dry glue

A technology for alumina dry glue and gel formation, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, chemical instruments and methods, catalyst carriers, etc. Complex process and other problems, to achieve the effect of suitable bubble size, low cost and reasonable pore distribution

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, an organic pore-enlarging agent is added to the sodium metaaluminate aqueous solution, and a defoaming agent is also added to control the size of the bubbles. This is not only a complicated process, but also easily out of control, resulting in too many or too few bubbles and affecting the quality of alumina. Pore ​​distribution
Furthermore, the average pore diameter and pore volume of alumina obtained by this method are relatively small, and the proportion of large pores needs to be increased, and further improvement is still needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take industrial grade aluminum hydroxide powder and industrial grade sodium hydroxide to prepare a concentration of 365 gAl 2 o 3 / L concentrated sodium metaaluminate solution, then diluted to a concentration of 25 gAl 2 o 3 / L of sodium metaaluminate solution, the gelling temperature is controlled at 29°C, polyoxyethylene polyoxypropylene pentaerythritol ether is added, the amount of surfactant accounts for 1.5% of the weight of sodium metaaluminate, air and CO 2 A mixture of gases, where CO 2 The volume concentration is 50%, and the mixed gas is used to stir. When the pH value drops to 10, the gelation is stopped, and the gelation time is 40 minutes. The slurry was washed with deionized water at 50° C. until neutral, and dried at 120° C. for 3 hours to obtain an alumina gel. Table 1 shows the physical and chemical properties obtained after calcination at 750°C for 3 hours.

Embodiment 2-3

[0027] The preparation method of alumina dry glue is identical with embodiment 1, and its difference is that the concentration of concentrated sodium metaaluminate solution is diluted to 30gAl respectively 2 o 3 / L, 35gAl 2 o 3 / L, the physical and chemical properties of the obtained alumina dry glue after roasting are shown in Table 1.

Embodiment 4-5

[0029] The preparation method of alumina dry glue is the same as that of Example 1, the difference is that the nonionic surfactant is changed into polyoxyethylene polyoxypropanolamine ether and polyoxypropylene oxide ethylene glyceryl ether, and its consumption is sodium metaaluminate 2.0% by weight. The physical and chemical properties of the obtained alumina dry glue after roasting are shown in Table 1.

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Abstract

The invention discloses a preparation method of an alumina dry glue. In the preparation method, a proper amount of RPE type and/or PEP type non-ionic surfactant is added during the glue-forming process of a carbonization method; the non-ionic surfactant has a pore-enlarging function and an anti-foaming function, and enables the generated bubble to have a uniform and proper size; thus the solution can evenly contact with gas, so the generation of alumina with a large pore size, a large pore volume, and reasonable pore distribution is assisted. The preparation method has the advantages of simple technology, easy operation, and low cost. The alumina dry glue is suitable for being used as a carrier component of a catalyst; and is especially suitable for being used as a carrier component of a catalyst, which is used to catalyze hydro-demetallization of heavy oil or residual oil.

Description

technical field [0001] The invention relates to a method for preparing alumina dry glue, in particular to a method for preparing alumina dry glue with large pore volume and large pore diameter suitable for use as a carrier component of a hydrogenation demetallization catalyst. Background technique [0002] There are many types of alumina such as γ-Al 2 o 3 , η-Al 2 o 3 , θ-Al 2 o 3 、δ-Al 2 o 3 and α-Al 2 o 3 etc., where γ-Al 2 o 3 and η-Al 2 o 3 For the commonly used activated alumina. [0003] Activated alumina has good specific surface area and pore structure, especially γ-Al 2 o 3 Due to its large specific surface area, adjustable pore structure and good thermal stability, it is widely used as catalyst carrier, desiccant and adsorbent in oil refining, petrochemical and fertilizer industries. Preparation of γ-Al 2 o 3 The usual method is to prepare pseudo-boehmite first, and then roast it at a certain temperature to convert it into γ-Al 2 o 3 . Pseudo-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14B01J32/00B01J21/04C10G45/04
Inventor 张艳侠付秋红高鹏段日袁胜华包洪洲王鼎聪
Owner CHINA PETROLEUM & CHEM CORP
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