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Purifying method and apparatus for air with low concentration organic pollutant

A technology of organic pollutants and purification devices, applied in the field of air purification, can solve the problems of light energy loss and low photon quantum efficiency, and achieve the effects of convenient regeneration process, simplified operation, improved service life and photocatalytic degradation efficiency

Inactive Publication Date: 2006-05-17
深圳市中拓天达环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is to say, the more uniform the distribution of light in the entire reactor, the better, because the catalyst that is not irradiated by light is ineffective, and when the local photocatalyst is over-irradiated, only a small part of the light energy will eventually trigger the photocatalyst. Catalytic reaction, while most of the light energy is lost in the form of thermal radiation, resulting in low photon quantum efficiency

Method used

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  • Purifying method and apparatus for air with low concentration organic pollutant
  • Purifying method and apparatus for air with low concentration organic pollutant
  • Purifying method and apparatus for air with low concentration organic pollutant

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Embodiment 1

[0031] Such as figure 1 As shown, a purifying device for low-concentration organic pollutants in the air of the present invention is a continuous circulating fluidized bed photocatalytic reactor, which adopts a three-layer columnar glass reactor, and the innermost layer is a U-shaped quartz glass tube 1 , the outer layer and the middle layer are ordinary hard glass, the light source ultraviolet lamp 7 is placed coaxially in the U-shaped quartz glass tube 1, the interlayer between the outer layer and the middle layer is a cooling water jacket 4, and the U-shaped quartz glass tube 1 and the middle layer The space between is photocatalyst fluid bed layer 5, and the bottom of reactor has reaction gas inlet 8, and top has reaction gas outlet 2, and the bottom of reactor has cooling water inlet 6, and the top of reactor has cooling water outlet 10, in A porous sand core 9 is fixed on the bottom of the photocatalyst fluidized bed 5 to support the loaded photocatalyst, and a layer of ...

Embodiment 2

[0033] TiO 2 / SiO 2 The composite supported photocatalyst is prepared by the following method:

[0034] In the first step, butyl titanate was added dropwise to the vigorously stirred acetic acid solution to obtain a white slurry with a molar ratio of butyl titanate: acetic acid: water of 1:5:30, and continued stirring to obtain a transparent sol. After this sol continued to stir for 2 hours, a translucent gel solution was obtained;

[0035] In the second step, a certain amount of silica gel (treated with dilute nitric acid, washed with double distilled water, and dried at 120°C for 2 hours) was added to the above-mentioned translucent gel solution to impregnate the coating twice, each dipping the coating Finally, dry the silica gel at 70°C for 2 hours to obtain a photocatalyst precursor;

[0036] The third step is to calcinate the photocatalyst precursor at 450°C for 4 hours to obtain the TiO 2 / SiO 2 Supported photocatalyst (the loading amount of the catalyst is 15%, and...

Embodiment 3

[0038] TiO 2 / SiO 2 The composite supported photocatalyst is prepared by the following method:

[0039] In the first step, butyl titanate was added dropwise to the vigorously stirred acetic acid solution to obtain a white slurry with a molar ratio of butyl titanate: acetic acid: water of 1:10:40, and continued stirring to obtain a transparent sol. After this sol continued to stir for 3 hours, a translucent gel solution was obtained;

[0040] In the second step, a certain amount of silica gel (treated with dilute nitric acid, washed with double-distilled water, and dried at 120°C for 2 hours) was added to the above-mentioned translucent gel solution to impregnate the coating 5 times, each dipping the coating Finally, dry the silica gel at 80°C for 1.5 hours to obtain a photocatalyst precursor;

[0041] The third step is to calcinate the photocatalyst precursor at 300°C for 8 hours to obtain the TiO 2 / SiO 2 Supported photocatalyst (the loading amount of the catalyst is 10%...

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Abstract

The purifying method of air with low concentration organic pollutant includes the following steps: making the air with low concentration organic pollutant flow through fluidized bed with photocatalyst in the flow rate of 0.15-1.5 cu m / hr for 1-4 hr to make the supported photocatalyst in í‹boilingíŒ state under the action of the air flow; and irradiating the fluidized bed with ultraviolet ray to make the organic pollutant adsorbed to the surface of the catalyst produce photocatalytic reaction for degradation and elimination. The corresponding purifying apparatus is also provided. The purifying method has high treating efficiency and is simple and fast, and the purifying apparatus has full contact between the photocatalyst and the reactant, high light quantum efficiency, high gaseous organic matter degrading efficiency and easy loading and unloading of the photocatalyst.

Description

technical field [0001] The invention relates to the technical field of air purification, in particular to a method for purifying low-concentration organic pollutants in the air and a purifying device thereof. Background technique [0002] As the scope of human production activities expands day by day, it leads to more and more serious environmental pollution. In particular, volatile organic compounds have caused serious environmental pollution, and have widely existed in water, soil and air. Most of these volatile organic compounds are toxic to the human body, and can also destroy the atmospheric ozone layer through photochemical reactions, causing serious negative effects on the atmospheric environment and human health. Among them, carbonyl compounds are a kind of main volatile organic pollutants, and low molecular weight carbonyl compounds such as formaldehyde and acetaldehyde are the main indoor pollutants, which are very harmful to human body an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/72B01D53/86
Inventor 安太成张茂林李桂英盛国英傅家谟
Owner 深圳市中拓天达环保科技有限公司
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