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Pseudo-boehmite containing amorphous silica alumina and preparation method thereof

A technology of amorphous silica-alumina and pseudo-boehmite, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problem of weak acidity of pure alumina carrier, and achieve high acidity, High specific surface area, the effect of overcoming poor molding

Active Publication Date: 2011-08-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing pseudo-boehmite containing amorphous silica-alumina, aiming at the disadvantages of poor molding conditions of amorphous silica-alumina and the weak acidity of pure alumina carrier. The acidity is enhanced, and the molding conditions have also been greatly improved, especially suitable for hydrotreating catalyst supports

Method used

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  • Pseudo-boehmite containing amorphous silica alumina and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] Configure 2L concentration as 100gAl 2 o 3 / L of sodium metaaluminate solution is placed in an 8L gelling tank, the temperature of the gelling tank is controlled at 40°C, and the concentration of 60v% CO is introduced under the condition of constant stirring. 2 The mixed gas of +40v% air, the flow rate of carbon dioxide in the mixed gas is 2Nm 3 / h, stop feeding carbon dioxide when the pH value reaches 10.5, and age for 25 minutes to obtain pseudo-boehmite slurry.

[0041] Configuration 4L concentration is 100gAl 2 o 3 / L of sodium metaaluminate solution is placed in the gel tank, then add 2L 100gSiO 2 / L of sodium silicate solution, control the reaction temperature at 30°C, and feed 60v% CO 2 Mixed gas of +40v% air, CO 2 The flow rate is 3Nm 3 / h, the pH at the end point is controlled to be 9.5, and the amorphous silica-alumina slurry is obtained by aging for 10 minutes.

[0042] Take 3L of amorphous silica-alumina slurry and add it to 1L of pseudo-boehmite slu...

Embodiment 2

[0044] The preparation of amorphous silica-alumina was carried out according to Example 1. Configure 2L concentration of 150gAl 2 o 3 / L of sodium metaaluminate solution, placed in an 8L gel-forming tank, the temperature of the gel-forming tank is controlled to be 35°C, and the concentration of 70v% CO is introduced under the condition of constant stirring. 2 The mixed gas of +30v% air, the flow rate of carbon dioxide in the mixed gas is 4Nm 3 / h, stop feeding carbon dioxide when the pH value reaches 10.0, and age for 20 minutes to obtain pseudo-boehmite slurry.

[0045] Take 2L pseudo-boehmite slurry and add it to 3L amorphous silicon-alumina slurry under constant stirring, control the mixing temperature at 30°C, age for 15min, filter and wash until Na + Dry at 120°C for 9 hours until the ion content is less than 0.5%, to obtain pseudo-boehmite product A2 containing amorphous silica-alumina.

Embodiment 3

[0047] The preparation of the pseudo-boehmite slurry was carried out according to Example 1. Configure 2L concentration of 130gAl 2 o 3 / L sodium metaaluminate solution is placed in the gel tank, and then add 2L 80gSiO 2 / L of sodium silicate solution, control the reaction temperature at 20°C, and feed 50v% CO 2 Mixed gas of +50v% air, CO 2 The flow rate is 5Nm 3 / h, the pH at the end point was controlled to be 9.0, and the amorphous silica-alumina slurry was obtained by aging for 20 minutes.

[0048] Under the condition of constant stirring, add 1L of pseudo-boehmite slurry and 3L of amorphous silica-alumina slurry into the gel forming tank concurrently, control the mixing temperature at 35°C, age for 15min, filter and wash to Na + Dry at 120°C for 8 hours until the ion content is less than 0.5%, to obtain pseudo-boehmite product A3 containing amorphous silica-alumina.

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Abstract

The invention relates to pseudo-boehmite containing amorphous silica alumina and a preparation method thereof. The pseudo-boehmite containing the amorphous silica alumina is obtained according to the conventional ageing, filtering and washing methods after amorphous silica alumina slurry and pseudo-boehmite slurry are mixed. The pseudo-boehmite contains 5 to 40 weight percent of silicon oxide, the specific surface area is 250 to 400 m<2> / g, the pore volume is 0.7 to 1.4ml / g, the surface acid site mainly comprises weak acid site, and the infrared acidity is 0.28 to 0.55mmol / g. The prepared pseudo-boehmite containing the amorphous silica alumina has the properties of high acidity and high specific surface area of the amorphous silica alumina, simultaneously has the advantages of the pseudo-boehmite, and solves the problem of poor formation of the amorphous silica alumina. The pseudo-boehmite containing the amorphous silica alumina is mainly applied to hydrogenation treatment, particularly preparation of an intermediate distillate hydrogenation catalyst carrier.

Description

technical field [0001] The invention relates to a method for preparing silicon-containing pseudo-boehmite, in particular to a method for preparing pseudo-boehmite containing amorphous silicon-alumina. Background technique [0002] In recent years, with the increasingly stringent environmental regulations, the requirements for sulfur content and nitrogen content in oil products have become more and more stringent; at the same time, because the quality of crude oil is getting worse and the content of impurities such as sulfur and nitrogen is getting higher and higher, the The requirements for hydrogen treatment catalysts are also getting higher and higher. For example, when hydrotreating coked diesel oil, higher content of nitrogen compounds, especially basic nitrogen compounds, will be adsorbed on the acidic sites of the catalyst, resulting in a decrease in desulfurization and denitrification activity of the catalyst, and improving the ability of the hydrotreating catalyst to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/12B01J35/10B01J37/03
Inventor 王廷海钱颖郑云弟柏介军康宏敏王宗宝梁顺琴常晓昕孙利民龚光碧颉伟潘曦竹吕龙刚吴杰蒋彩兰边虎马好文
Owner PETROCHINA CO LTD
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