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Amorphous silica-alumina and its preparing method

A technology of amorphous silica-alumina and silica, applied in chemical instruments and methods, catalyst carriers, physical/chemical process catalysts, etc., can solve the problems of polluted environment, low pore volume and specific surface, non-concentrated pore distribution, etc., to achieve High selectivity of medium oil, simple process and easy control

Active Publication Date: 2008-08-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is to form a mixed solution of alkali metal aluminum salt and silicate at a pH of about 12, and then react with aluminum sulfate to prepare a silicon-aluminum carrier. The specific surface of the product is 277m 2 / g, pore volume 0.31ml / g, containing SiO 2 35wt%, the disadvantage is that the pore volume and specific surface are low, as a carrier catalyst, silica-alumina cannot provide higher metal dispersion for active components
[0006] CN 1210755A discloses an amorphous silicon aluminum and its preparation method, its silicon oxide content is 10-50wt%, and its specific surface is 350-600m 2 / g, pore volume 0.8~1.5ml / g, infrared acidity 0.25~0.55mmol / g, its preparation process is NH 4 OH and alumina first form alumina and then decompose silicate, which will produce ammonia and nitrogen-containing wastewater and pollute the environment
[0007] CN 1597093A introduces a kind of amorphous silicon aluminum prepared by carbonization method, intermittent production operation, SiO 2 The content accounts for 8wt%~50wt% in the carrier, but the pore volume and specific surface area are relatively low, and the pore distribution is not concentrated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Prepare 700g of solid sodium aluminate to a concentration of 200gAl 2 o 3 / l concentrated sodium aluminate solution, then diluted to a concentration of 35gAl 2 o 3 / L sodium aluminate working solution (a), take SiO 2 28wt% sodium silicate solution, then diluted to a concentration of 150gSiO 2 / l sodium silicate working solution 2L (b). Take a 30L steel plastic tank, open the container valves containing (a) and (b) respectively, and ventilate and feed CO at a concentration of 45v% at the same time 2 Gas, set the flow rate of (a) and (b) so that the reaction time is 1 hour, and quickly adjust the CO 2 The flow rate is to keep the pH of the system at about 10.0, and the reaction temperature is 30°C. After the reaction of (a) and (b) is completed, stop feeding CO 2 , and then the ventilation was stable for 45 minutes, and the slurry was filtered and washed with 85°C deionized water until neutral. Dry at 120°C for 8 hours, pulverize and sieve to obtain amorphous silic...

example 2

[0028] Prepare 450g of solid sodium aluminate to a concentration of 200gAl 2 o 3 / l concentrated sodium aluminate solution, then diluted to a concentration of 45gAl 2 o 3 / L sodium aluminate working solution (a), take SiO 2 28wt% sodium silicate solution, then diluted to a concentration of 200gSiO 2 / l sodium silicate working solution 0.25L (b). Take a 30L steel plastic tank, open the container valves containing (a) and (b) respectively, and simultaneously ventilate and feed CO with a concentration of 35v%. 2 Gas, set the flow rate of (a) and (b) so that the reaction time is 40 minutes, and quickly adjust the CO 2 The flow rate is to keep the pH of the system at about 10.0, and the reaction temperature is 25°C. After the reaction of (a) and (b) is completed, stop feeding CO 2 , and then the ventilation was stable for 35 minutes, and the slurry was filtered and washed with 75°C deionized water until neutral. Dry at 120°C for 8 hours, pulverize and sieve to obtain amorpho...

example 3

[0030] Prepare 800g of solid sodium aluminate to a concentration of 200gAl 2 o 3 / l concentrated sodium aluminate solution, then diluted to a concentration of 40gAl 2 o 3 / L sodium aluminate working solution (a), take SiO 2 28wt% sodium silicate solution, then diluted to a concentration of 200gSiO 2 / l sodium silicate working solution 1L (b). Take a 30L steel plastic tank, open the container valves containing (a) and (b) respectively, and simultaneously ventilate and feed CO with a concentration of 50v% 2 Gas, set the flow rate of (a) and (b) so that the reaction time is 50 minutes, and quickly adjust the CO 2 flow rate, keep the pH of the system at about 10.5, and the reaction temperature is 35°C. After (a) and (b) have reacted, stop feeding CO 2, and then the air was stabilized for 40 minutes, and the slurry was filtered and washed with 80°C deionized water until neutral. Dry at 120°C for 8 hours, pulverize and sieve to obtain amorphous silica-alumina GL-3. (Will)

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Abstract

The present invention provides a amorphous silica-alumina and its preparing method. The amorphous silica-alumina employs parallel current coprecipitation method, the method has a simple preparation, easily controlled, and adopts CO2 and wind mix at the same time, the reactant is fully mixed, and effectively mutual action of silica and aluminum is ensured, so silica-alumina having large specific surface area and a large specific pore volume is formed, the distribution of pore is concentrative, 4-10nm pore volume is about 85%-95% of the total pore volume, pore volume which aperture is bigger than 15nm, is below 5% of the total pore volume. The preparing step has no discharge of waste water containing ammonia, nitrogen, and has no environment pollution.

Description

technical field [0001] The invention relates to an amorphous silica-alumina and a preparation method thereof, in particular to an amorphous silica-alumina used as one of hydrocracking catalyst carriers for producing middle distillates and a preparation method thereof. Background technique [0002] Amorphous silica-alumina has certain pore structure and specific surface area, so it can be used as catalyst carrier and adsorbent in oil refining and petrochemical industry. Amorphous silica-alumina as a catalyst carrier requires itself to have a large specific surface and pore volume to ensure the dispersion of catalyst active components, and as a carrier for cracking catalysts, amorphous silica-alumina must also have a certain cracking activity (i.e. acidic). [0003] With the rapid development of the petrochemical industry, the demand for amorphous silicon-alumina is increasing, but the amorphous silicon-alumina prepared by the existing technology mostly uses NH 4 OH, which w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/12
Inventor 孙晓艳樊宏飞王战宇
Owner CHINA PETROLEUM & CHEM CORP
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