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A method and device for preparing nano-alumina from sulfur-containing flue gas

A nano-alumina and flue gas technology, applied in the direction of alumina/aluminum hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the high production cost of nano-alumina and the pollution of sulfur-containing flue gas to the environment and other problems, to achieve the effect of uniform size, high purity and cost saving

Active Publication Date: 2017-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems of high production cost of nano-alumina and environmental pollution by sulfur-containing flue gas, and realizes up-to-standard discharge of sulfur-containing flue gas and low-cost production of high-value-added nano-alumina

Method used

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  • A method and device for preparing nano-alumina from sulfur-containing flue gas
  • A method and device for preparing nano-alumina from sulfur-containing flue gas
  • A method and device for preparing nano-alumina from sulfur-containing flue gas

Examples

Experimental program
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Effect test

Embodiment 1

[0032] S-Zorb regeneration flue gas of an oil refinery, the gas volume is 1200Nm 3 / h, the temperature is 204°C, the pressure is 70kPa, and the composition of sulfur-containing flue gas is shown in Table 1.

[0033] Table 1 Composition of S-Zorb regeneration flue gas in a refinery

[0034]

[0035] Adopt the present invention to attach figure 1 According to the method and device, the sulfur-containing flue gas first enters the quencher and uses process water to cool down. After cooling, the temperature is 45°C, and then enters the spray absorption section equipped with 2-layer spray equipment, and the absorption liquid contacts the flue gas countercurrently. Washing, the liquid-gas ratio is 6, the absorption liquid absorbs the sulfur dioxide in the flue gas, and the cleaner flue gas after passing through the demister is discharged from the flue at the top of the absorption tower.

[0036] After the sodium metaaluminate and the supernatant of the concentration tank are ful...

Embodiment 2

[0041] Take the same S-Zorb regeneration flue gas as in Example 1 as the processing object. Adopt the present invention to attach figure 1 According to the method and device, the sulfur-containing flue gas first enters the quencher and uses process water to cool down. After cooling, the temperature is 40°C, and then enters the spray absorption section equipped with 1-layer spray equipment, and the absorption liquid contacts the flue gas countercurrently. Washing, the liquid-to-gas ratio is 4, the absorption liquid absorbs the sulfur dioxide in the flue gas, and the cleaner flue gas after passing through the demister is discharged from the flue at the top of the absorption tower.

[0042] After the sodium metaaluminate and the supernatant of the concentration tank are fully stirred and mixed, a sodium metaaluminate solution with a mass concentration of 20% is prepared as a supplement to the absorption liquid and added to the absorption liquid circulation pipeline and the concen...

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Abstract

The invention discloses a method utilizing sulfur-containing flue gas to prepare nano alumina. The method comprises the following steps: contacting sulfur-containing flue gas with a sodium meta-aluminate solution in an absorption tower in opposite directions, after absorption, discharging flue gas from the top of the absorption tower, introducing absorption liquid into a concentration tank to carry out further reaction and solid-liquid separation, adding a sodium meta-aluminate solution to control the pH value of liquid in the concentration tank in a range of 9 to 12; introducing the precipitate obtained in solid-liquid separation into a gel tank, stirring the gel, at the same time, controlling the pH value in a range of 9 to 12, after the aging of gel, subjecting the gel to suction filtration, washing, drying, and finally burning the gel to obtain nano alumina. The provided method and apparatus solve the problems that the nano alumina production cost is high and sulfur-containing flue gas pollutes the environment, the processed sulfur-containing flue gas can meet the discharge standards, and the low cost production of nano alumina with a high additional value is realized.

Description

technical field [0001] The invention relates to a method for preparing nano-alumina, in particular to a method and a device for preparing nano-alumina by utilizing sulfur-containing flue gas. Background technique [0002] Nano-alumina is an ultrafine particle with a size of 1-100 nm. Since the advent of nano-scale alumina powder in the mid-1980s, people have continuously deepened their understanding of this high-tech material, and discovered many of its characteristics, such as very large surface area, large surface tension, very large binding force between particles, iron system The magnetism of the ultrafine particles of the alloy is obviously stronger than that of the bulk metal, the ultrafine particles have a strong absorption capacity for light, the melting point is much lower than that of the metal block, the chemical activity is strong, it is easy to chemical reaction, and there is almost no thermal insulation at low temperature Wait. Nano-alumina exhibits strong vo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02B82Y30/00
Inventor 刘志禹陈新马蕊英
Owner CHINA PETROLEUM & CHEM CORP
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