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Pseudo-boehmite containing amorphous silica alumina and preparation method thereof

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

Active Publication Date: 2013-09-04
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
Comparison scheme
Effect test

Embodiment 1

[0040] Configuration 2L concentration is 100gAl 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 40℃, and the concentration of 60v%CO is injected under constant stirring conditions 2 +40v% air mixed gas, the flow of carbon dioxide in the mixed gas is 2Nm 3 / h, when the pH value reaches 10.5, stop the introduction of carbon dioxide, and age for 25min to obtain pseudo-boehmite slurry.

[0041] Configuration 4L concentration is 100gAl 2 O 3 / L sodium metaaluminate solution is placed in the gel tank, and then 2L 100gSiO 2 / L of sodium silicate solution, control the reaction temperature to 30℃, and pass in 60v% CO 2 +40v% air mixed gas, CO 2 The flow rate is 3Nm 3 / h, the pH value of the control end point is 9.5, and aging for 10 minutes to obtain an amorphous silica alumina slurry.

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

Embodiment 2

[0044] The preparation of amorphous silicon aluminum was carried out according to Example 1. Configuration 2L concentration is 150gAl 2 O 3 / L of sodium metaaluminate solution, placed in an 8L gel forming tank, control the temperature of the gel forming tank to 35℃, and under continuous stirring, the concentration of 70v% CO 2 +30v% air mixed gas, the flow of carbon dioxide in the mixed gas is 4Nm 3 / h, when the pH value reaches 10.0, stop the introduction of carbon dioxide, and age for 20 minutes to obtain pseudo-boehmite slurry.

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

Embodiment 3

[0047] The preparation of pseudo-boehmite slurry was carried out in accordance with Example 1. Configuration 2L concentration is 130gAl 2 O 3 / L sodium metaaluminate solution is placed in the gel tank, and then 2L 80gSiO 2 / L of sodium silicate solution, control the reaction temperature to 20℃, and pass in 50v% CO 2 +50v% air mixed gas, CO 2 The flow rate is 5Nm 3 / h, the pH value of the control end point is 9.0, aging for 20 minutes to obtain an amorphous silica-alumina slurry.

[0048] Under the condition of constant stirring, add 1L pseudo-boehmite slurry and 3L amorphous silica-alumina slurry into the gelling tank, control the mixing temperature at 35℃, age for 15min, filter and wash to Na + Dry for 8 hours at 120°C until the ion content is less than 0.5% to obtain pseudo-boehmite product A3 containing amorphous silicon-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 the 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 increasing. For example, during the hydrotreating of coke diesel, higher content of nitrogen compounds, especially basic nitrogen compounds, will be adsorbed on the acidic sites of the catalyst, resulting in a decrease in the catalyst's desulfurization and denitrification activity, thereby increasing the ability of the hydrotreating catalyst to remove ...

Claims

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Application Information

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Patent Type & Authority Patents(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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