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Molded siliceous hydrated alumina, preparation method thereof, and molded siliceous alumina

A technology of silicon hydrated alumina and hydrated alumina, applied in metal/metal oxide/metal hydroxide catalysts, silicon compounds, chemical instruments and methods, etc., can solve problems such as unhealthy operator health, unfavorable environmental protection and the like, Achieve the effect of being beneficial to environmental protection, reducing the impact of operator health, and good absorption performance

Active Publication Date: 2013-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Also, acids (for example: nitric acid, citric acid, oxalic acid, acetic acid, formic acid, malonic acid, hydrochloric acid and trichloroacetic acid) are usually used as peptizers. A large amount of acid gas is released during the process, which is not only harmful to the health of operators, but also not conducive to environmental protection

Method used

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  • Molded siliceous hydrated alumina, preparation method thereof, and molded siliceous alumina
  • Molded siliceous hydrated alumina, preparation method thereof, and molded siliceous alumina
  • Molded siliceous hydrated alumina, preparation method thereof, and molded siliceous alumina

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Experimental program
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Effect test

Embodiment 1

[0086] Measure 12mL of water glass solution (purchased from Sinopec Catalyst Changling Branch, SiO 2 Content is 280g / L, modulus is 3.26) dissolved in deionized water to prepare 95mL water glass dilute solution. 100.0g of pseudoboehmite powder (purchased from Sinopec Catalyst Changling Branch, dry basis content of 69.5% by weight), 4.0g of methylcellulose (purchased from Zhejiang Haishen Chemical Co., Ltd.), 3.0g of Sesame powder Mix well with 95mL of the above water glass dilute solution. The resulting mixture is fed into an extruder and extruded to obtain a wet strip. The extruded wet strip was placed in an oven and dried at a temperature of 150° C. for 12 hours, so as to obtain the silicon-containing hydrated alumina molding according to the present invention. The radial crushing strength, water absorption rate and δ value of the obtained moldings were measured, and the results are listed in Table 1.

Embodiment 2

[0095] (1) In a 2L reaction tank, add 2000mL of aluminum sulfate solution and sodium metaaluminate solution (Al 2 o 3 content of 200g / L, caustic coefficient of 1.58) for precipitation reaction, the reaction temperature is 50°C, the pH value is 6.0, and the reaction residence time is 15 minutes; the obtained slurry is filtered with a vacuum filter. Add 20L of deionized water (at a temperature of 40±5°C) to the filter cake to rinse the filter cake for about 60 minutes. Add the washed filter cake to 1.5L deionized water and stir to form a slurry, then pump the slurry into the spray dryer for drying, control the outlet temperature of the spray dryer within the range of 100-110°C, and the material drying time for 2 minutes to obtain amorphous hydrated alumina powder, in which Al 2o 3 The content is 63% by weight, and it is determined to be amorphous by XRD analysis.

[0096] (2) Weigh 50.0g of alkaline silica sol (purchased from Beijing Hongxing Guangsha Chemical Building Mater...

Embodiment 3

[0098] Weigh 5.0 g of acidic silica sol (purchased from Beijing Zhongxi Yuanda Technology Co., Ltd., SiO 2 The content is 30% by weight, Na 2 O<0.006% by weight, pH 2-6), dissolved in deionized water with stirring to prepare 95 mL of acidic silica sol aqueous solution. 60.0g of pseudo-boehmite (purchased from Sinopec Catalyst Changling Branch, with a dry basis content of 69.5% by weight), 40.0g of gibbsite (purchased from Guangxi Pingguo Aluminum Company, with a dry basis content of 64.5% by weight %), 1.0g methylcellulose (purchased from Zhejiang Haishen Chemical Co., Ltd.), 2.0g hydroxypropyl methylcellulose (purchased from Zhejiang Haishen Chemical Co., Ltd.), 3.0g scallop powder and 95mL of the above acid silicon The aqueous sol solution was stirred evenly. The resulting mixture is fed into an extruder and extruded to obtain a wet strip. The obtained wet strip was placed in an oven and dried at a temperature of 80° C. for 12 hours, so as to obtain the silicon-containing...

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Abstract

The invention provides a molded siliceous hydrated alumina, and a preparation method and an application thereof. The molded siliceous hydrated alumina is prepared through using raw materials containing at least one hydrated alumina, at least one siliceous compound and at least one cellulose ether, and has a water absorption of 0.4-1.5, a radial crushing strength of above 12N / mm and a strength loss rate after immersion in water of below 10%. The invention also provides a molded siliceous alumina. The molded siliceous alumina is prepared through roasting the molded siliceous hydrated alumina. The invention further provides an application of the molded siliceous hydrated alumina and the molded siliceous alumina as a dryer or a carrier of a supported catalyst. The above molded materials have good strength retention rates and absorption properties, and catalysts prepared by using the molded materials as the carrier have high catalysis properties. No peptizing agents are used in the preparation method.

Description

technical field [0001] The invention relates to a silicon-containing hydrated alumina molding and its preparation method and application, and the invention also relates to a silicon-containing alumina molding and its application. Background technique [0002] Alumina, especially γ-alumina, because of its good pore structure, heat resistance stability, and high specific surface area, alumina moldings are often used as carriers for desiccants or supported catalysts. The properties of alumina can be adjusted to meet the requirements of specific occasions by introducing silicon into the alumina molding. For example, using silicon-containing alumina moldings as a carrier to prepare a hydrogenation catalyst can adjust the hydrogenation refining performance of the catalyst. [0003] The silica-containing alumina molding can be obtained by mixing hydrated alumina with water, peptizer and optional extrusion aid, and the mixture is successively shaped, dried, and high-temperature roa...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/10B01J20/20B01J20/30B01D53/26B01J32/00B01J21/12B01J27/19B01J23/888C10G45/04C10G45/08
Inventor 曾双亲杨清河李丁健一孙淑玲刘滨任亮聂红李大东
Owner CHINA PETROLEUM & CHEM CORP
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