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Method for preparing aluminum hydroxide through carbonization

A technology of aluminum hydroxide and alumina, which is applied in the field of preparation of aluminum hydroxide by the carbonization method, can solve the problems of unstable properties of alumina, short reaction time, difficult control, etc., and achieve easy control, complete reaction, and large pore volume Effect

Active Publication Date: 2013-06-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the short reaction time, the amount of carbon dioxide and sodium metaaluminate is difficult to control, and the properties of alumina are unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare solid sodium aluminate to a concentration of 200gAl 2 o 3 / L concentrated sodium aluminate solution, then diluted to a concentration of 25gAl 2 o 3 / L and 35gAl 2 o 3 / L sodium aluminate working solution, take a 30L steel to make a plastic tank, first add 5L containing 25gAl 2 o 3 / L sodium aluminate working solution, while ventilating and feeding CO with a concentration of 45v% 2 Gas, the reaction temperature is 25°C, the reaction time is 1 hour, and when the pH value reaches 12.0, quickly adjust the CO 2 flow rate, add 5.4L containing 35gAl 2 o 3 / L sodium aluminate working solution, add 11g of polyethylene glycol with a molecular weight of 20,000 at the same time, keep the pH of the system at about 10.5, the reaction temperature is 25°C, and the reaction time is 1 hour. After the reaction is completed, stop feeding CO 2 , and then the ventilation was stable for 60 minutes, and the slurry was filtered and washed with deionized water at 60°C until neu...

Embodiment 2

[0032] Prepare solid sodium aluminate to a concentration of 200gAl 2 o 3 / L concentrated sodium aluminate solution, then diluted to a concentration of 25gAl 2 o 3 / L and 35gAl 2 o 3 / L sodium aluminate working solution, take a 30L steel to make a plastic tank, first add 5L containing 25gAl 2 o 3 / L sodium aluminate working solution, while ventilating and feeding CO with a concentration of 45v% 2 gas, the reaction temperature is 25°C, the reaction time is 1 hour, when the pH value reaches 11.5, quickly adjust the CO 2 flow rate, add 8.3L containing 35gAl 2 o 3 / L sodium aluminate working solution, add 17g polyethylene glycol with a molecular weight of 20,000 at the same time, keep the pH of the system at about 10.0, the reaction temperature is 25°C, and the reaction time is 1 hour. After the reaction is completed, stop feeding CO 2 , and then the ventilation was stable for 60 minutes, and the slurry was filtered and washed with deionized water at 60°C until neutral. Th...

Embodiment 3

[0034] Prepare solid sodium aluminate to a concentration of 200gAl 2 o 3 / L concentrated sodium aluminate solution, then diluted to a concentration of 25gAl 2 o 3 / L sodium aluminate working solution, take a 30L steel to make a plastic tank, first add 5L containing 25gAl 2 o 3 / L sodium aluminate working solution, while ventilating and feeding CO with a concentration of 40v% 2 gas, the reaction temperature is 25°C, the reaction time is 1.2 hours, when the pH value reaches 12.0, quickly adjust the CO 2 The flow rate, add 11L containing 25gAl 2 o 3 / L sodium aluminate working solution, add 21g polyethylene glycol with a molecular weight of 20,000 at the same time, keep the pH of the system at about 10.0, the reaction temperature is 25°C, and the reaction time is 0.8 hours. After the reaction is completed, stop feeding CO 2 , and then the ventilation was stable for 60 minutes, and the slurry was filtered and washed with deionized water at 60°C until neutral. Dry at 120°C...

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PUM

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Abstract

The invention discloses a preparation method of aluminum hydroxide. In the method, sodium aluminate and CO2 are subjected to precipitation. Specifically, one part of sodium aluminate has a changed pH value, and the other part of sodium aluminate has a constant pH value, and they are subjected to co-precipitation in single streams. Simultaneously, a high-molecular surfactant is added. Aluminum hydroxide obtained by the method of the invention has large specific surface area and pore volume, as well as pore size distribution concentrated in the range of 10-20nm. The aluminum hydroxide in the invention is especially suitable to serve as a carrier of a diene selective hydrogenation catalyst, and has the characteristic of high hydrogenation performance.

Description

technical field [0001] The invention relates to a method for preparing aluminum hydroxide by a carbonization method, in particular to a method for preparing macroporous alumina by a carbon dioxide neutralization method, which is suitable for the selective hydrogenation of diolefins. Background technique [0002] Alumina has a certain pore structure and specific surface area, so it can be used as a catalyst carrier and adsorbent in oil refining and petrochemical industry. Alumina, as a catalyst carrier, requires itself to have a large specific surface and pore volume to ensure the dispersion of the active components of the catalyst. [0003] With the rapid development of the petrochemical industry, the demand for alumina is increasing, and higher requirements are put forward for the physical and chemical properties of alumina. However, most of the alumina prepared by the existing technology uses NH 4 OH, which will produce wastewater containing ammonia and nitrogen, which wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
Inventor 孙晓艳樊宏飞王占宇
Owner CHINA PETROLEUM & CHEM CORP
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