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A kind of preparation method of amorphous silica-alumina spherical carrier

A technology of amorphous silica-alumina and spherical support, which is applied in catalyst supports, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve problems such as poor adaptability of raw materials, uneven distribution of silica-alumina, and poor sphericity

Active Publication Date: 2016-01-20
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Among them, the particle size of the product prepared by spray granulation is small; the roll forming is mainly used in the forming of hydraulic materials, and the raw material adaptability is poor; the particle size of the shaping granulation product is not uniform, the sphericity is poor, and the process is complicated, not suitable for continuous production, and the preparation process is dusty. Large, high loss of raw materials; although oil (ammonia) column molding can produce high-performance spherical carriers, the high cost of this process limits its application range
[0010] In the existing silicon-alumina spherical carrier preparation technology, there are disadvantages such as uneven distribution of silicon-alumina, two times of drying and roasting for the preparation of powder and carrier, difficulty in forming powder into balls, or high cost. It is urgent to develop a uniform distribution, Preparation technology of amorphous silicon-aluminum spherical carrier with large-scale adjustment of silicon-aluminum ratio, simple preparation process and low cost

Method used

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  • A kind of preparation method of amorphous silica-alumina spherical carrier

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Embodiment 1

[0024] 100gAl 2 o 3 / L sodium metaaluminate solution 180ml, 70gSiO 2 / L sodium silicate solution 190ml and 100gAl 2 o 3 Add 140ml of / L aluminum sulfate solution to the reaction vessel with 200ml of deionized water in parallel flow, keep the reaction temperature at 35-40°C, and the pH value at 8.0-8.5, add it in 1.0 hour, then heat to 80°C for aging for 2.0 hours , solid-liquid separation, fully beating and washing with deionized water, and suction filtration to obtain 138g of amorphous silicon-aluminum composite oxide filter cake with a solid content of 33%. The above-mentioned filter cake was added in batches to 150 ml of a 2.5% sodium alginate aqueous solution, stirred and mixed thoroughly to obtain a suspension with a dynamic viscosity of 260 mPa·s. Then the suspension was dropped into 0.5 mol / L aluminum nitrate aqueous solution, gelled for 5 minutes, and formed silicon-aluminum composite oxide-sodium alginate gel pellets, further washed with deionized water, dried at ...

Embodiment 2

[0026] 200gAl 2 o 3 / L sodium metaaluminate solution 150ml, 100gSiO 2 / L sodium silicate solution 200ml and 200gAl 2 o 3Add 110ml of / L aluminum sulfate solution to the reaction vessel with 200ml of deionized water in parallel flow, keep the reaction temperature at 30-35°C, and the pH value at 7.5-8.0, add it in 2.0 hours, then heat to 85°C for 1.0 hour aging , solid-liquid separation, fully beating and washing with deionized water, and suction filtration to obtain 200 g of amorphous silicon-aluminum composite oxide filter cake with a solid content of 36%. The above filter cake was added in batches to 260 ml of a 1.5% sodium alginate aqueous solution, stirred and mixed thoroughly to obtain a suspension with a dynamic viscosity of 150 mPa·s. Then the suspension was dropped into 2.0 mol / L calcium nitrate aqueous solution, gelled for 1 min to form silica-alumina composite oxide-sodium alginate gel beads, further washed with deionized water, dried at 80°C for 12 hours, 500 Th...

Embodiment 3

[0028] 150gAl 2 o 3 / L sodium metaaluminate solution 180ml, 150gSiO 2 / L sodium silicate solution 100ml and 180gAl 2 o 3 Add 103ml of / L aluminum sulfate solution to the reaction container that has been added with 300ml of deionized water in parallel, keep the reaction temperature at 35-40°C, and the pH value at 7.0-7.5, add it in 0.5 hours, then heat to 75°C and age for 2.0 hours , solid-liquid separation, fully beating and washing with deionized water, and suction filtration to obtain 152 g of amorphous silicon-aluminum composite oxide filter cake with a solid content of 40%. The above filter cake was added in batches to 260 ml of an aqueous solution of sodium alginate with a mass fraction of 4.0%, and fully stirred and mixed to obtain a suspension with a dynamic viscosity of 450 mPa·s. Then drop the suspension into 2mol / L ferric nitrate aqueous solution and gel for 1min to form silica-aluminum composite oxide-sodium alginate gel pellets, which are further washed with de...

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Abstract

The invention relates to a method for preparing a spherical amorphous silicon aluminum carrier. The method is characterized by comprising the following steps: firstly, preparing a filter cake containing an amorphous silicon aluminum composite oxide by using a neutralization method; secondly, adding a sodium alginate water solution to obtain an amorphous silicon aluminum composite oxide-sodium alginate suspension, dropwise adding the silicon aluminum composite oxide-sodium alginate suspension into a water solution containing divalent or trivalent metal ions with certain concentration, and gelling to form small amorphous silicon aluminum composite oxide-alginate composite balls; finally, washing, drying and roasting the small amorphous silicon aluminum composite oxide-alginate composite balls to obtain the spherical amorphous silicon aluminum carrier. According to the method, the spherical amorphous silicon aluminum carrier is prepared by directly molding the amorphous silicon aluminum composite oxide filter cake in a mild water phase, and only drying and roasting the filter cake once; the spherical amorphous silicon aluminum carrier is low in energy consumption, pollution-free and simple in preparation process, convenient to operate and easy to realize industrial production.

Description

Technical field: [0001] The invention belongs to the field of preparation of inorganic materials, and relates to a method for preparing an amorphous silicon-aluminum spherical carrier. More specifically, the invention relates to a filter cake prepared by a neutralization method for amorphous silicon-aluminum composite oxide. Fully mixed with sodium alginate aqueous solution to obtain a suspension, further drop into the metal salt solution to form a gel, dry and roast to obtain an amorphous silica-alumina spherical carrier. Background technique: [0002] The progress of petrochemical catalyst technology often benefits from the improvement of the performance of catalytic materials, so the research on carrier preparation technology has been widely valued. With the development of the catalyst industry, the improvement of carrier performance plays an increasingly important role in the replacement of catalysts. The performance of the carrier is mainly determined by the chemical c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J35/08B01J21/06
Inventor 李晓云于海斌孙彦民杨文建曾贤君李世鹏周鹏隋云乐谢献娜
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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